From 9333228381023e36e749e7f358c04a1c794d9281 Mon Sep 17 00:00:00 2001 From: Website Deployment Script Date: Thu, 21 Jul 2016 09:33:19 +0000 Subject: [PATCH] Updated docs for 0.30 --- docs/accessibility.html | 4 +- docs/actionsheetios.html | 6 +- docs/activityindicator.html | 9 +- docs/alert.html | 6 +- docs/alertios.html | 6 +- docs/android-building-from-source.html | 4 +- docs/android-ui-performance.html | 4 +- docs/animated.html | 6 +- docs/animations.html | 4 +- docs/appregistry.html | 4 +- docs/appstate.html | 6 +- docs/asyncstorage.html | 6 +- docs/backandroid.html | 4 +- docs/cameraroll.html | 6 +- docs/clipboard.html | 6 +- docs/colors.html | 4 +- docs/communication-ios.html | 6 +- docs/datepickerandroid.html | 6 +- docs/datepickerios.html | 10 +- docs/debugging.html | 4 +- docs/dimensions.html | 4 +- docs/direct-manipulation.html | 4 +- docs/drawerlayoutandroid.html | 24 ++-- docs/flexbox.html | 4 +- docs/geolocation.html | 6 +- docs/gesture-responder-system.html | 4 +- docs/getting-started.html | 4 +- docs/handling-text-input.html | 4 +- docs/handling-touches.html | 4 +- docs/height-and-width.html | 4 +- docs/image.html | 43 +++++-- docs/images.html | 4 +- docs/integration-with-existing-apps.html | 4 +- docs/intentandroid.html | 4 +- docs/interactionmanager.html | 4 +- docs/javascript-environment.html | 4 +- docs/layout-props.html | 104 ++++++++++------ docs/layoutanimation.html | 6 +- docs/linking-libraries-ios.html | 4 +- docs/linking.html | 6 +- docs/listview.html | 6 +- docs/listviewdatasource.html | 4 +- docs/mapview.html | 14 +-- docs/modal.html | 6 +- docs/more-resources.html | 4 +- docs/native-components-android.html | 4 +- docs/native-components-ios.html | 4 +- docs/native-modules-android.html | 4 +- docs/native-modules-ios.html | 4 +- docs/nativemethodsmixin.html | 4 +- ...igator-comparison.html => navigation.html} | 82 ++----------- docs/navigator.html | 4 +- docs/navigatorios.html | 13 +- docs/netinfo.html | 6 +- docs/network.html | 13 +- docs/panresponder.html | 6 +- docs/performance.html | 4 +- docs/picker.html | 6 +- docs/pickerios.html | 4 +- docs/pixelratio.html | 6 +- docs/platform-specific-code.html | 4 +- docs/progressbarandroid.html | 6 +- docs/progressviewios.html | 4 +- docs/props.html | 4 +- docs/pushnotificationios.html | 6 +- docs/refreshcontrol.html | 6 +- docs/running-on-device-android.html | 4 +- docs/running-on-device-ios.html | 4 +- docs/running-on-simulator-ios.html | 4 +- docs/scrollview.html | 8 +- docs/segmentedcontrolios.html | 14 +-- docs/shadow-props.html | 6 +- docs/signed-apk-android.html | 4 +- docs/slider.html | 16 +-- docs/sliderios.html | 20 +-- docs/state.html | 4 +- docs/statusbar.html | 6 +- docs/statusbarios.html | 4 +- docs/style.html | 4 +- docs/stylesheet.html | 4 +- docs/switch.html | 6 +- docs/tabbarios-item.html | 4 +- docs/tabbarios.html | 6 +- docs/testing.html | 4 +- docs/text.html | 36 ++++-- docs/textinput.html | 114 +++++++++++++---- docs/timepickerandroid.html | 6 +- docs/timers.html | 4 +- docs/toastandroid.html | 6 +- docs/toolbarandroid.html | 21 ++-- docs/touchablehighlight.html | 4 +- docs/touchablenativefeedback.html | 4 +- docs/touchableopacity.html | 4 +- docs/touchablewithoutfeedback.html | 4 +- docs/transforms.html | 19 ++- docs/troubleshooting.html | 4 +- docs/tutorial.html | 4 +- docs/upgrading.html | 4 +- docs/using-a-listview.html | 4 +- docs/using-a-scrollview.html | 4 +- docs/using-navigators.html | 116 ++++++++++++++++++ docs/vibration.html | 6 +- docs/vibrationios.html | 6 +- docs/view.html | 87 +++++++------ docs/viewpagerandroid.html | 23 ++-- docs/webview.html | 6 +- img/ObjectObserveError.png | Bin 0 -> 7539 bytes index.html | 4 +- releases/0.30/docs/running-on-device-ios.html | 2 +- releases/0.30/versions.html | 2 +- showcase.html | 4 +- support.html | 4 +- versions.html | 4 +- 113 files changed, 736 insertions(+), 476 deletions(-) rename docs/{navigator-comparison.html => navigation.html} (54%) create mode 100644 docs/using-navigators.html create mode 100644 img/ObjectObserveError.png diff --git a/docs/accessibility.html b/docs/accessibility.html index e17bb5c5ce8..575e09da1a4 100644 --- a/docs/accessibility.html +++ b/docs/accessibility.html @@ -1,4 +1,4 @@ -Accessibility – React Native | A framework for building native apps using React
React Native0.29

The Basics

Guides

Guides (iOS)

Guides (Android)

components

apis

Accessibility #

Edit on GitHub

Native App Accessibility (iOS and Android) #

Both iOS and Android provide APIs for making apps accessible to people with disabilities. In addition, both platforms provide bundled assistive technologies, like the screen readers VoiceOver (iOS) and TalkBack (Android) for the visually impaired. Similarly, in React Native we have included APIs designed to provide developers with support for making apps more accessible. Take note, iOS and Android differ slightly in their approaches, and thus the React Native implementations may vary by platform.

Making Apps Accessible #

Accessibility properties #

accessible (iOS, Android) #

When true, indicates that the view is an accessibility element. When a view is an accessibility element, it groups its children into a single selectable component. By default, all touchable elements are accessible.

On Android, ‘accessible={true}’ property for a react-native View will be translated into native ‘focusable={true}’.

<View accessible={true}> +Accessibility – React Native | A framework for building native apps using React
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Accessibility #

Edit on GitHub

Native App Accessibility (iOS and Android) #

Both iOS and Android provide APIs for making apps accessible to people with disabilities. In addition, both platforms provide bundled assistive technologies, like the screen readers VoiceOver (iOS) and TalkBack (Android) for the visually impaired. Similarly, in React Native we have included APIs designed to provide developers with support for making apps more accessible. Take note, iOS and Android differ slightly in their approaches, and thus the React Native implementations may vary by platform.

Making Apps Accessible #

Accessibility properties #

accessible (iOS, Android) #

When true, indicates that the view is an accessibility element. When a view is an accessibility element, it groups its children into a single selectable component. By default, all touchable elements are accessible.

On Android, ‘accessible={true}’ property for a react-native View will be translated into native ‘focusable={true}’.

<View accessible={true}> <Text>text one</Text> <Text>text two</Text> </View>

In the above example, we can't get accessibility focus separately on 'text one' and 'text two'. Instead we get focus on a parent view with 'accessible' property.

accessibilityLabel (iOS, Android) #

When a view is marked as accessible, it is a good practice to set an accessibilityLabel on the view, so that people who use VoiceOver know what element they have selected. VoiceOver will read this string when a user selects the associated element.

To use, set the accessibilityLabel property to a custom string on your View:

<TouchableOpacity accessible={true} accessibilityLabel={'Tap me!'} onPress={this._onPress}> @@ -54,6 +54,6 @@ apiKey: '2c98749b4a1e588efec53b2acec13025', indexName: 'react-native-versions', inputSelector: '#algolia-doc-search', - algoliaOptions: { facetFilters: [ "tags:0.29" ], hitsPerPage: 5 } + algoliaOptions: { facetFilters: [ "tags:0.30" ], hitsPerPage: 5 } }); \ No newline at end of file diff --git a/docs/actionsheetios.html b/docs/actionsheetios.html index 9b3420a91cf..4873524d936 100644 --- a/docs/actionsheetios.html +++ b/docs/actionsheetios.html @@ -1,9 +1,9 @@ -ActionSheetIOS – React Native | A framework for building native apps using React
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ActionSheetIOS #

Edit on GitHub

Methods #

static showActionSheetWithOptions(options, callback) #

Display an iOS action sheet. The options object must contain one or more +ActionSheetIOS – React Native | A framework for building native apps using React

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ActionSheetIOS #

Edit on GitHub

Methods #

static showActionSheetWithOptions(options, callback) #

Display an iOS action sheet. The options object must contain one or more of:

  • options (array of strings) - a list of button titles (required)
  • cancelButtonIndex (int) - index of cancel button in options
  • destructiveButtonIndex (int) - index of destructive button in options
  • title (string) - a title to show above the action sheet
  • message (string) - a message to show below the title

static showShareActionSheetWithOptions(options, failureCallback, successCallback) #

Display the iOS share sheet. The options object should contain one or both of message and url and can additionally have a subject or excludedActivityTypes:

  • url (string) - a URL to share
  • message (string) - a message to share
  • subject (string) - a subject for the message
  • excludedActivityTypes (array) - the activites to exclude from the ActionSheet

NOTE: if url points to a local file, or is a base64-encoded uri, the file it points to will be loaded and shared directly. -In this way, you can share images, videos, PDF files, etc.

Examples #

Edit on GitHub
'use strict'; +In this way, you can share images, videos, PDF files, etc.

Examples #

Edit on GitHub
'use strict'; var React = require('react'); var ReactNative = require('react-native'); @@ -228,6 +228,6 @@ exports.examples \ No newline at end of file diff --git a/docs/activityindicator.html b/docs/activityindicator.html index 58b825a3e21..acd1efa3a8a 100644 --- a/docs/activityindicator.html +++ b/docs/activityindicator.html @@ -1,5 +1,8 @@ -ActivityIndicator – React Native | A framework for building native apps using React
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ActivityIndicator #

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Displays a circular loading indicator.

Props #

View props... #

animating bool #

Whether to show the indicator (true, the default) or hide it (false).

color color #

The foreground color of the spinner (default is gray).

size enum('small', 'large') #

Size of the indicator. Small has a height of 20, large has a height of 36. -Other sizes can be obtained using a scale transform.

ioshidesWhenStopped bool #

Whether the indicator should hide when not animating (true by default).

Examples #

Edit on GitHub
'use strict'; +ActivityIndicator – React Native | A framework for building native apps using React
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ActivityIndicator #

Edit on GitHub

Displays a circular loading indicator.

Props #

View props... #

animating PropTypes.bool #

Whether to show the indicator (true, the default) or hide it (false).

color color #

The foreground color of the spinner (default is gray).

size PropTypes.oneOf([ + 'small', + 'large', +]) #

Size of the indicator. Small has a height of 20, large has a height of 36. +Other sizes can be obtained using a scale transform.

ioshidesWhenStopped PropTypes.bool #

Whether the indicator should hide when not animating (true by default).

Examples #

Edit on GitHub
'use strict'; const React = require('react'); const ReactNative = require('react-native'); @@ -172,6 +175,6 @@ const styles = StyleSheet \ No newline at end of file diff --git a/docs/alert.html b/docs/alert.html index 3cec4d23a5d..d79c5654d11 100644 --- a/docs/alert.html +++ b/docs/alert.html @@ -1,4 +1,4 @@ -Alert – React Native | A framework for building native apps using React
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Alert #

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Launches an alert dialog with the specified title and message.

Optionally provide a list of buttons. Tapping any button will fire the +Alert – React Native | A framework for building native apps using React

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Alert #

Edit on GitHub

Launches an alert dialog with the specified title and message.

Optionally provide a list of buttons. Tapping any button will fire the respective onPress callback and dismiss the alert. By default, the only button will be an 'OK' button.

This is an API that works both on iOS and Android and can show static alerts. To show an alert that prompts the user to enter some information, @@ -13,7 +13,7 @@ of a neutral, negative and a positive button:

  • If you specify one butt {text: 'Cancel', onPress: () => console.log('Cancel Pressed'), style: 'cancel'}, {text: 'OK', onPress: () => console.log('OK Pressed')}, ] -)

Methods #

static alert(title, message?, buttons?, type?) #

Examples #

Edit on GitHub
'use strict'; +)

Methods #

static alert(title, message?, buttons?, type?) #

Examples #

Edit on GitHub
'use strict'; var React = require('react'); var ReactNative = require('react-native'); @@ -150,6 +150,6 @@ module.exports \ No newline at end of file diff --git a/docs/alertios.html b/docs/alertios.html index 0c7f4fca53b..5d4600f8ba5 100644 --- a/docs/alertios.html +++ b/docs/alertios.html @@ -1,4 +1,4 @@ -AlertIOS – React Native | A framework for building native apps using React
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AlertIOS #

Edit on GitHub

AlertIOS provides functionality to create an iOS alert dialog with a +AlertIOS – React Native | A framework for building native apps using React

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AlertIOS #

Edit on GitHub

AlertIOS provides functionality to create an iOS alert dialog with a message or create a prompt for user input.

Creating an iOS alert:

AlertIOS.alert( 'Sync Complete', 'All your data are belong to us.' @@ -40,7 +40,7 @@ cross-platform support if you don't need to create iOS-only prompts.

=> console.log("Your username is "+text), null, 'default' -);

Type Definitions #

AlertType #

An Alert button type

Type:
$Enum

Constants:
ValueDescription
default

Default alert with no inputs

plain-text

Plain text input alert

secure-text

Secure text input alert

login-password

Login and password alert

AlertButtonStyle #

An Alert button style

Type:
$Enum

Constants:
ValueDescription
default

Default button style

cancel

Cancel button style

destructive

Destructive button style

ButtonsArray #

Array or buttons

Type:
Array

Properties:
Name and TypeDescription
[text]

string

Button label

[onPress]

function

Callback function when button pressed

[style]

Button style

Examples #

Edit on GitHub
'use strict'; +);

Type Definitions #

AlertType #

An Alert button type

Type:
$Enum

Constants:
ValueDescription
default

Default alert with no inputs

plain-text

Plain text input alert

secure-text

Secure text input alert

login-password

Login and password alert

AlertButtonStyle #

An Alert button style

Type:
$Enum

Constants:
ValueDescription
default

Default button style

cancel

Cancel button style

destructive

Destructive button style

ButtonsArray #

Array or buttons

Type:
Array

Properties:
Name and TypeDescription
[text]

string

Button label

[onPress]

function

Callback function when button pressed

[style]

Button style

Examples #

Edit on GitHub
'use strict'; var React = require('react'); var ReactNative = require('react-native'); @@ -219,6 +219,6 @@ class PromptOptions extends \ No newline at end of file diff --git a/docs/android-building-from-source.html b/docs/android-building-from-source.html index 06b2cdf724e..fc3170c9ce9 100644 --- a/docs/android-building-from-source.html +++ b/docs/android-building-from-source.html @@ -1,4 +1,4 @@ -Building React Native from source – React Native | A framework for building native apps using React
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Building React Native from source #

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You will need to build React Native from source if you want to work on a new feature/bug fix, try out the latest features which are not released yet, or maintain your own fork with patches that cannot be merged to the core.

Prerequisites #

Assuming you have the Android SDK installed, run android to open the Android SDK Manager.

Make sure you have the following installed:

  1. Android SDK version 23 (compileSdkVersion in build.gradle)
  2. SDK build tools version 23.0.1 (buildToolsVersion in build.gradle)
  3. Local Maven repository for Support Libraries (formerly Android Support Repository) >= 17 (for Android Support Library)
  4. Android NDK (download links and installation instructions below)

Point Gradle to your Android SDK: #

Step 1: Set environment variables through your local shell.

Note: Files may vary based on shell flavor. See below for examples from common shells.

  • bash: .bash_profile or .bashrc
  • zsh: .zprofile or .zshrc
  • ksh: .profile or $ENV

Example:

export ANDROID_SDK=/Users/your_unix_name/android-sdk-macosx +Building React Native from source – React Native | A framework for building native apps using React
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Building React Native from source #

Edit on GitHub

You will need to build React Native from source if you want to work on a new feature/bug fix, try out the latest features which are not released yet, or maintain your own fork with patches that cannot be merged to the core.

Prerequisites #

Assuming you have the Android SDK installed, run android to open the Android SDK Manager.

Make sure you have the following installed:

  1. Android SDK version 23 (compileSdkVersion in build.gradle)
  2. SDK build tools version 23.0.1 (buildToolsVersion in build.gradle)
  3. Local Maven repository for Support Libraries (formerly Android Support Repository) >= 17 (for Android Support Library)
  4. Android NDK (download links and installation instructions below)

Point Gradle to your Android SDK: #

Step 1: Set environment variables through your local shell.

Note: Files may vary based on shell flavor. See below for examples from common shells.

  • bash: .bash_profile or .bashrc
  • zsh: .zprofile or .zshrc
  • ksh: .profile or $ENV

Example:

export ANDROID_SDK=/Users/your_unix_name/android-sdk-macosx export ANDROID_NDK=/Users/your_unix_name/android-ndk/android-ndk-r10e

Step 2: Create a local.properties file in the android directory of your react-native app with the following contents:

Example:

sdk.dir=/Users/your_unix_name/android-sdk-macosx ndk.dir=/Users/your_unix_name/android-ndk/android-ndk-r10e

Download links for Android NDK #

  1. Mac OS (64-bit) - http://dl.google.com/android/repository/android-ndk-r10e-darwin-x86_64.zip
  2. Linux (64-bit) - http://dl.google.com/android/repository/android-ndk-r10e-linux-x86_64.zip
  3. Windows (64-bit) - http://dl.google.com/android/repository/android-ndk-r10e-windows-x86_64.zip
  4. Windows (32-bit) - http://dl.google.com/android/repository/android-ndk-r10e-windows-x86.zip

You can find further instructions on the official page.

Building the source #

1. Installing the fork #

First, you need to install react-native from your fork. For example, to install the master branch from the official repo, run the following:

npm install --save github:facebook/react-native#master

Alternatively, you can clone the repo to your node_modules directory and run npm install inside the cloned repo.

2. Adding gradle dependencies #

Add gradle-download-task as dependency in android/build.gradle:

... dependencies { @@ -44,6 +44,6 @@ dependencies { apiKey: '2c98749b4a1e588efec53b2acec13025', indexName: 'react-native-versions', inputSelector: '#algolia-doc-search', - algoliaOptions: { facetFilters: [ "tags:0.29" ], hitsPerPage: 5 } + algoliaOptions: { facetFilters: [ "tags:0.30" ], hitsPerPage: 5 } }); \ No newline at end of file diff --git a/docs/android-ui-performance.html b/docs/android-ui-performance.html index 7532a022535..7b920bd4219 100644 --- a/docs/android-ui-performance.html +++ b/docs/android-ui-performance.html @@ -1,4 +1,4 @@ -Profiling Android UI Performance – React Native | A framework for building native apps using React
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Profiling Android UI Performance #

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We try our best to deliver buttery-smooth UI performance by default, but sometimes that just isn't possible. Remember, Android supports 10k+ different phones and is generalized to support software rendering: the framework architecture and need to generalize across many hardware targets unfortunately means you get less for free relative to iOS. But sometimes, there are things you can improve (and many times it's not native code's fault at all!).

The first step for debugging this jank is to answer the fundamental question of where your time is being spent during each 16ms frame. For that, we'll be using a standard Android profiling tool called systrace. But first...

Make sure that JS dev mode is OFF!

You should see __DEV__ === false, development-level warning are OFF, performance optimizations are ON in your application logs (which you can view using adb logcat)

Profiling with Systrace #

Systrace is a standard Android marker-based profiling tool (and is installed when you install the Android platform-tools package). Profiled code blocks are surrounded by markers start/end markers which are then visualized in a colorful chart format. Both the Android SDK and React Native framework provide standard markers that you can visualize.

Collecting a trace #

NOTE:

Systrace support was added in react-native v0.15. You will need to build with that version to collect a trace.

First, connect a device that exhibits the stuttering you want to investigate to your computer via USB and get it to the point right before the navigation/animation you want to profile. Run systrace as follows

$ <path_to_android_sdk>/platform-tools/systrace/systrace.py --time=10 -o trace.html sched gfx view -a <your_package_name>

A quick breakdown of this command:

  • time is the length of time the trace will be collected in seconds
  • sched, gfx, and view are the android SDK tags (collections of markers) we care about: sched gives you information about what's running on each core of your phone, gfx gives you graphics info such as frame boundaries, and view gives you information about measure, layout, and draw passes
  • -a <your_package_name> enables app-specific markers, specifically the ones built into the React Native framework. your_package_name can be found in the AndroidManifest.xml of your app and looks like com.example.app

Once the trace starts collecting, perform the animation or interaction you care about. At the end of the trace, systrace will give you a link to the trace which you can open in your browser.

Reading the trace #

After opening the trace in your browser (preferably Chrome), you should see something like this:

Example

HINT: Use the WASD keys to strafe and zoom

Enable VSync highlighting #

The first thing you should do is highlight the 16ms frame boundaries if you haven't already done that. Check this checkbox at the top right of the screen:

Enable VSync Highlighting

You should see zebra stripes as in the screenshot above. If you don't, try profiling on a different device: Samsung has been known to have issues displaying vsyncs while the Nexus series is generally pretty reliable.

Find your process #

Scroll until you see (part of) the name of your package. In this case, I was profiling com.facebook.adsmanager, which shows up as book.adsmanager because of silly thread name limits in the kernel.

On the left side, you'll see a set of threads which correspond to the timeline rows on the right. There are three/four threads we care about for our purposes: the UI thread (which has your package name or the name UI Thread), mqt_js and mqt_native_modules. If you're running on Android 5+, we also care about the Render Thread.

UI Thread #

This is where standard android measure/layout/draw happens. The thread name on the right will be your package name (in my case book.adsmanager) or UI Thread. The events that you see on this thread should look something like this and have to do with Choreographer, traversals, and DispatchUI:

UI Thread Example

JS Thread #

This is where JS is executed. The thread name will be either mqt_js or <...> depending on how cooperative the kernel on your device is being. To identify it if it doesn't have a name, look for things like JSCall, Bridge.executeJSCall, etc:

JS Thread Example

Native Modules Thread #

This is where native module calls (e.g. the UIManager) are executed. The thread name will be either mqt_native_modules or <...>. To identify it in the latter case, look for things like NativeCall, callJavaModuleMethod, and onBatchComplete:

Native Modules Thread Example

Bonus: Render Thread #

If you're using Android L (5.0) and up, you will also have a render thread in your application. This thread generates the actual OpenGL commands used to draw your UI. The thread name will be either RenderThread or <...>. To identify it in the latter case, look for things like DrawFrame and queueBuffer:

Render Thread Example

Identifying a culprit #

A smooth animation should look something like the following:

Smooth Animation

Each change in color is a frame -- remember that in order to display a frame, all our UI work needs to be done by the end of that 16ms period. Notice that no thread is working close to the frame boundary. An application rendering like this is rendering at 60FPS.

If you noticed chop, however, you might see something like this:

Choppy Animation from JS

Notice that the JS thread is executing basically all the time, and across frame boundaries! This app is not rendering at 60FPS. In this case, the problem lies in JS.

You might also see something like this:

Choppy Animation from UI

In this case, the UI and render threads are the ones that have work crossing frame boundaries. The UI that we're trying to render on each frame is requiring too much work to be done. In this case, the problem lies in the native views being rendered.

At this point, you'll have some very helpful information to inform your next steps.

JS Issues #

If you identified a JS problem, look for clues in the specific JS that you're executing. In the scenario above, we see RCTEventEmitter being called multiple times per frame. Here's a zoom-in of the JS thread from the trace above:

Too much JS

This doesn't seem right. Why is it being called so often? Are they actually different events? The answers to these questions will probably depend on your product code. And many times, you'll want to look into shouldComponentUpdate.

TODO: Add more tools for profiling JS

Native UI Issues #

If you identified a native UI problem, there are usually two scenarios:

  1. the UI you're trying to draw each frame involves to much work on the GPU, or
  2. You're constructing new UI during the animation/interaction (e.g. loading in new content during a scroll).

Too much GPU work #

In the first scenario, you'll see a trace that has the UI thread and/or Render Thread looking like this:

Overloaded GPU

Notice the long amount of time spent in DrawFrame that crosses frame boundaries. This is time spent waiting for the GPU to drain its command buffer from the previous frame.

To mitigate this, you should:

  • investigate using renderToHardwareTextureAndroid for complex, static content that is being animated/transformed (e.g. the Navigator slide/alpha animations)
  • make sure that you are not using needsOffscreenAlphaCompositing, which is disabled by default, as it greatly increases the per-frame load on the GPU in most cases.

If these don't help and you want to dig deeper into what the GPU is actually doing, you can check out Tracer for OpenGL ES.

Creating new views on the UI thread #

In the second scenario, you'll see something more like this:

Creating Views

Notice that first the JS thread thinks for a bit, then you see some work done on the native modules thread, followed by an expensive traversal on the UI thread.

There isn't an easy way to mitigate this unless you're able to postpone creating new UI until after the interaction, or you are able to simplify the UI you're creating. The react native team is working on a infrastructure level solution for this that will allow new UI to be created and configured off the main thread, allowing the interaction to continue smoothly.

Still stuck? #

If you are confused or stuck, please post ask on Stack Overflow with the react-native tag. If you are unable to get a response there, or find an issue with a core component, please File a Github issue.

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Profiling Android UI Performance #

Edit on GitHub

We try our best to deliver buttery-smooth UI performance by default, but sometimes that just isn't possible. Remember, Android supports 10k+ different phones and is generalized to support software rendering: the framework architecture and need to generalize across many hardware targets unfortunately means you get less for free relative to iOS. But sometimes, there are things you can improve (and many times it's not native code's fault at all!).

The first step for debugging this jank is to answer the fundamental question of where your time is being spent during each 16ms frame. For that, we'll be using a standard Android profiling tool called systrace. But first...

Make sure that JS dev mode is OFF!

You should see __DEV__ === false, development-level warning are OFF, performance optimizations are ON in your application logs (which you can view using adb logcat)

Profiling with Systrace #

Systrace is a standard Android marker-based profiling tool (and is installed when you install the Android platform-tools package). Profiled code blocks are surrounded by markers start/end markers which are then visualized in a colorful chart format. Both the Android SDK and React Native framework provide standard markers that you can visualize.

Collecting a trace #

NOTE:

Systrace support was added in react-native v0.15. You will need to build with that version to collect a trace.

First, connect a device that exhibits the stuttering you want to investigate to your computer via USB and get it to the point right before the navigation/animation you want to profile. Run systrace as follows

$ <path_to_android_sdk>/platform-tools/systrace/systrace.py --time=10 -o trace.html sched gfx view -a <your_package_name>

A quick breakdown of this command:

  • time is the length of time the trace will be collected in seconds
  • sched, gfx, and view are the android SDK tags (collections of markers) we care about: sched gives you information about what's running on each core of your phone, gfx gives you graphics info such as frame boundaries, and view gives you information about measure, layout, and draw passes
  • -a <your_package_name> enables app-specific markers, specifically the ones built into the React Native framework. your_package_name can be found in the AndroidManifest.xml of your app and looks like com.example.app

Once the trace starts collecting, perform the animation or interaction you care about. At the end of the trace, systrace will give you a link to the trace which you can open in your browser.

Reading the trace #

After opening the trace in your browser (preferably Chrome), you should see something like this:

Example

If your trace .html file isn't opening correctly, check your browser console for the following:

ObjectObserveError

Since Object.observe was deprecated in recent browsers, you may have to open the file from the Google Chrome Tracing tool. You can do so by:

  • Opening tab in chrome chrome://tracing
  • Selecting load
  • Selecting the html file generated from the previous command.

HINT: Use the WASD keys to strafe and zoom

Enable VSync highlighting #

The first thing you should do is highlight the 16ms frame boundaries if you haven't already done that. Check this checkbox at the top right of the screen:

Enable VSync Highlighting

You should see zebra stripes as in the screenshot above. If you don't, try profiling on a different device: Samsung has been known to have issues displaying vsyncs while the Nexus series is generally pretty reliable.

Find your process #

Scroll until you see (part of) the name of your package. In this case, I was profiling com.facebook.adsmanager, which shows up as book.adsmanager because of silly thread name limits in the kernel.

On the left side, you'll see a set of threads which correspond to the timeline rows on the right. There are three/four threads we care about for our purposes: the UI thread (which has your package name or the name UI Thread), mqt_js and mqt_native_modules. If you're running on Android 5+, we also care about the Render Thread.

UI Thread #

This is where standard android measure/layout/draw happens. The thread name on the right will be your package name (in my case book.adsmanager) or UI Thread. The events that you see on this thread should look something like this and have to do with Choreographer, traversals, and DispatchUI:

UI Thread Example

JS Thread #

This is where JS is executed. The thread name will be either mqt_js or <...> depending on how cooperative the kernel on your device is being. To identify it if it doesn't have a name, look for things like JSCall, Bridge.executeJSCall, etc:

JS Thread Example

Native Modules Thread #

This is where native module calls (e.g. the UIManager) are executed. The thread name will be either mqt_native_modules or <...>. To identify it in the latter case, look for things like NativeCall, callJavaModuleMethod, and onBatchComplete:

Native Modules Thread Example

Bonus: Render Thread #

If you're using Android L (5.0) and up, you will also have a render thread in your application. This thread generates the actual OpenGL commands used to draw your UI. The thread name will be either RenderThread or <...>. To identify it in the latter case, look for things like DrawFrame and queueBuffer:

Render Thread Example

Identifying a culprit #

A smooth animation should look something like the following:

Smooth Animation

Each change in color is a frame -- remember that in order to display a frame, all our UI work needs to be done by the end of that 16ms period. Notice that no thread is working close to the frame boundary. An application rendering like this is rendering at 60FPS.

If you noticed chop, however, you might see something like this:

Choppy Animation from JS

Notice that the JS thread is executing basically all the time, and across frame boundaries! This app is not rendering at 60FPS. In this case, the problem lies in JS.

You might also see something like this:

Choppy Animation from UI

In this case, the UI and render threads are the ones that have work crossing frame boundaries. The UI that we're trying to render on each frame is requiring too much work to be done. In this case, the problem lies in the native views being rendered.

At this point, you'll have some very helpful information to inform your next steps.

JS Issues #

If you identified a JS problem, look for clues in the specific JS that you're executing. In the scenario above, we see RCTEventEmitter being called multiple times per frame. Here's a zoom-in of the JS thread from the trace above:

Too much JS

This doesn't seem right. Why is it being called so often? Are they actually different events? The answers to these questions will probably depend on your product code. And many times, you'll want to look into shouldComponentUpdate.

TODO: Add more tools for profiling JS

Native UI Issues #

If you identified a native UI problem, there are usually two scenarios:

  1. the UI you're trying to draw each frame involves to much work on the GPU, or
  2. You're constructing new UI during the animation/interaction (e.g. loading in new content during a scroll).

Too much GPU work #

In the first scenario, you'll see a trace that has the UI thread and/or Render Thread looking like this:

Overloaded GPU

Notice the long amount of time spent in DrawFrame that crosses frame boundaries. This is time spent waiting for the GPU to drain its command buffer from the previous frame.

To mitigate this, you should:

  • investigate using renderToHardwareTextureAndroid for complex, static content that is being animated/transformed (e.g. the Navigator slide/alpha animations)
  • make sure that you are not using needsOffscreenAlphaCompositing, which is disabled by default, as it greatly increases the per-frame load on the GPU in most cases.

If these don't help and you want to dig deeper into what the GPU is actually doing, you can check out Tracer for OpenGL ES.

Creating new views on the UI thread #

In the second scenario, you'll see something more like this:

Creating Views

Notice that first the JS thread thinks for a bit, then you see some work done on the native modules thread, followed by an expensive traversal on the UI thread.

There isn't an easy way to mitigate this unless you're able to postpone creating new UI until after the interaction, or you are able to simplify the UI you're creating. The react native team is working on a infrastructure level solution for this that will allow new UI to be created and configured off the main thread, allowing the interaction to continue smoothly.

Still stuck? #

If you are confused or stuck, please post ask on Stack Overflow with the react-native tag. If you are unable to get a response there, or find an issue with a core component, please File a Github issue.

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Recently, we have been working hard to make the documentation better based on your feedback. Your responses to this yes/no style survey will help us gauge whether we moved in the right direction with the improvements. Thank you!

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\ No newline at end of file diff --git a/docs/animated.html b/docs/animated.html index aa5cc30936a..bd4486579bc 100644 --- a/docs/animated.html +++ b/docs/animated.html @@ -1,4 +1,4 @@ -Animated – React Native | A framework for building native apps using React
React Native0.29

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Animated #

Edit on GitHub

Animations are an important part of modern UX, and the Animated +Animated – React Native | A framework for building native apps using React

React Native0.30

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Animated #

Edit on GitHub

Animations are an important part of modern UX, and the Animated library is designed to make them fluid, powerful, and easy to build and maintain.

The simplest workflow is to create an Animated.Value, hook it up to one or more style attributes of an animated component, and then drive updates either @@ -125,7 +125,7 @@ API to normal Animated.Value, but multiplexed. Contains two regula } }

Methods #

constructor(valueIn?) #

setValue(value) #

setOffset(offset) #

flattenOffset(0) #

stopAnimation(callback?) #

addListener(callback) #

removeListener(id) #

getLayout(0) #

Converts {x, y} into {left, top} for use in style, e.g.

style={this.state.anim.getLayout()}

getTranslateTransform(0) #

Converts {x, y} into a useable translation transform, e.g.

style={{ transform: this.state.anim.getTranslateTransform() - }}

Examples #

Edit on GitHub
'use strict'; + }}

Examples #

Edit on GitHub
'use strict'; var React = require('react'); var ReactNative = require('react-native'); @@ -361,6 +361,6 @@ exports.examples \ No newline at end of file diff --git a/docs/animations.html b/docs/animations.html index a460d2a0775..39450b78770 100644 --- a/docs/animations.html +++ b/docs/animations.html @@ -1,4 +1,4 @@ -Animations – React Native | A framework for building native apps using React
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Animations #

Edit on GitHub

Fluid, meaningful animations are essential to the mobile user experience. Like +Animations – React Native | A framework for building native apps using React

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Animations #

Edit on GitHub

Fluid, meaningful animations are essential to the mobile user experience. Like everything in React Native, Animation APIs for React Native are currently under development, but have started to coalesce around two complementary systems: LayoutAnimation for animated global layout transactions, and Animated for @@ -391,6 +391,6 @@ source.

\ No newline at end of file diff --git a/docs/appregistry.html b/docs/appregistry.html index d03cdff5260..52bee4ce1b5 100644 --- a/docs/appregistry.html +++ b/docs/appregistry.html @@ -1,4 +1,4 @@ -AppRegistry – React Native | A framework for building native apps using React
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AppRegistry #

Edit on GitHub

AppRegistry is the JS entry point to running all React Native apps. App +AppRegistry – React Native | A framework for building native apps using React

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AppRegistry #

Edit on GitHub

AppRegistry is the JS entry point to running all React Native apps. App root components should register themselves with AppRegistry.registerComponent, then the native system can load the bundle for the app and then actually run the app when it's ready by invoking @@ -22,6 +22,6 @@ sure the JS execution environment is setup before other modules are apiKey: '2c98749b4a1e588efec53b2acec13025', indexName: 'react-native-versions', inputSelector: '#algolia-doc-search', - algoliaOptions: { facetFilters: [ "tags:0.29" ], hitsPerPage: 5 } + algoliaOptions: { facetFilters: [ "tags:0.30" ], hitsPerPage: 5 } }); \ No newline at end of file diff --git a/docs/appstate.html b/docs/appstate.html index a9a648212d5..8d41b2d3d1d 100644 --- a/docs/appstate.html +++ b/docs/appstate.html @@ -1,4 +1,4 @@ -AppState – React Native | A framework for building native apps using React

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AppState #

Edit on GitHub

AppState can tell you if the app is in the foreground or background, +AppState – React Native | A framework for building native apps using React

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AppState #

Edit on GitHub

AppState can tell you if the app is in the foreground or background, and notify you when the state changes.

AppState is frequently used to determine the intent and proper behavior when handling push notifications.

App States #

  • active - The app is running in the foreground
  • background - The app is running in the background. The user is either in another app or on the home screen
  • inactive - This is a state that occurs when transitioning between @@ -31,7 +31,7 @@ and providing the handler

    TODO: now that AppState is a subclass of NativeE addEventListener and removeEventListener and just use addListener and listener.remove() directly. That will be a breaking change though, as both the method and event names are different (addListener events are currently -required to be globally unique).

removeEventListener(type, handler) #

Remove a handler by passing the change event type and the handler

Examples #

Edit on GitHub
'use strict'; +required to be globally unique).

removeEventListener(type, handler) #

Remove a handler by passing the change event type and the handler

Examples #

Edit on GitHub
'use strict'; const React = require('react'); const ReactNative = require('react-native'); @@ -130,6 +130,6 @@ exports.examples \ No newline at end of file diff --git a/docs/asyncstorage.html b/docs/asyncstorage.html index 5f1dc439de2..5fef0a3f052 100644 --- a/docs/asyncstorage.html +++ b/docs/asyncstorage.html @@ -1,4 +1,4 @@ -AsyncStorage – React Native | A framework for building native apps using React
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AsyncStorage #

Edit on GitHub

AsyncStorage is a simple, asynchronous, persistent, key-value storage +AsyncStorage – React Native | A framework for building native apps using React

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AsyncStorage #

Edit on GitHub

AsyncStorage is a simple, asynchronous, persistent, key-value storage system that is global to the app. It should be used instead of LocalStorage.

It is recommended that you use an abstraction on top of AsyncStorage instead of AsyncStorage directly for anything more than light usage since it operates globally.

On iOS, AsyncStorage is backed by native code that stores small values in a @@ -115,7 +115,7 @@ AsyncStorage. // Console log results: // => UID234 {"name":"Chris","age":31,"traits":{"shoe_size":10,"hair":"brown","eyes":"blue"}} -// => UID345 {"name":"Marge","age":26,"traits":{"shoe_size":6,"hair":"blonde","eyes":"green"}}

Examples #

Edit on GitHub
'use strict'; +// => UID345 {"name":"Marge","age":26,"traits":{"shoe_size":6,"hair":"blonde","eyes":"green"}}

Examples #

Edit on GitHub
'use strict'; var React = require('react'); var ReactNative = require('react-native'); @@ -235,6 +235,6 @@ exports.examples \ No newline at end of file diff --git a/docs/backandroid.html b/docs/backandroid.html index 958fcb63b50..2e927739976 100644 --- a/docs/backandroid.html +++ b/docs/backandroid.html @@ -1,4 +1,4 @@ -BackAndroid – React Native | A framework for building native apps using React
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BackAndroid #

Edit on GitHub

Detect hardware back button presses, and programmatically invoke the default back button +BackAndroid – React Native | A framework for building native apps using React

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BackAndroid #

Edit on GitHub

Detect hardware back button presses, and programmatically invoke the default back button functionality to exit the app if there are no listeners or if none of the listeners return true.

Example:

BackAndroid.addEventListener('hardwareBackPress', function() { if (!this.onMainScreen()) { this.goBack(); @@ -21,6 +21,6 @@ functionality to exit the app if there are no listeners or if none of the listen apiKey: '2c98749b4a1e588efec53b2acec13025', indexName: 'react-native-versions', inputSelector: '#algolia-doc-search', - algoliaOptions: { facetFilters: [ "tags:0.29" ], hitsPerPage: 5 } + algoliaOptions: { facetFilters: [ "tags:0.30" ], hitsPerPage: 5 } }); \ No newline at end of file diff --git a/docs/cameraroll.html b/docs/cameraroll.html index b7f18fbb117..a5f122d86a2 100644 --- a/docs/cameraroll.html +++ b/docs/cameraroll.html @@ -1,8 +1,8 @@ -CameraRoll – React Native | A framework for building native apps using React
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CameraRoll #

Edit on GitHub

CameraRoll provides access to the local camera roll / gallery.

Methods #

static saveImageWithTag(tag) #

static saveToCameraRoll(tag, type?) #

Saves the photo or video to the camera roll / gallery.

On Android, the tag must be a local image or video URI, such as "file:///sdcard/img.png".

On iOS, the tag can be any image URI (including local, remote asset-library and base64 data URIs) +CameraRoll – React Native | A framework for building native apps using React

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CameraRoll #

Edit on GitHub

CameraRoll provides access to the local camera roll / gallery.

Methods #

static saveImageWithTag(tag) #

static saveToCameraRoll(tag, type?) #

Saves the photo or video to the camera roll / gallery.

On Android, the tag must be a local image or video URI, such as "file:///sdcard/img.png".

On iOS, the tag can be any image URI (including local, remote asset-library and base64 data URIs) or a local video file URI (remote or data URIs are not supported for saving video at this time).

If the tag has a file extension of .mov or .mp4, it will be inferred as a video. Otherwise it will be treated as a photo. To override the automatic choice, you can pass an optional type parameter that must be one of 'photo' or 'video'.

Returns a Promise which will resolve with the new URI.

static getPhotos(params) #

Returns a Promise with photo identifier objects from the local camera -roll of the device matching shape defined by getPhotosReturnChecker.

@param {object} params See getPhotosParamChecker.

Returns a Promise which when resolved will be of shape getPhotosReturnChecker.

Examples #

Edit on GitHub
'use strict'; +roll of the device matching shape defined by getPhotosReturnChecker.

@param {object} params See getPhotosParamChecker.

Returns a Promise which when resolved will be of shape getPhotosReturnChecker.

Examples #

Edit on GitHub
'use strict'; const React = require('react'); const ReactNative = require('react-native'); @@ -144,6 +144,6 @@ exports.examples \ No newline at end of file diff --git a/docs/clipboard.html b/docs/clipboard.html index ae83295dc5f..c98647bea9a 100644 --- a/docs/clipboard.html +++ b/docs/clipboard.html @@ -1,8 +1,8 @@ -Clipboard – React Native | A framework for building native apps using React
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Clipboard #

Edit on GitHub

Clipboard gives you an interface for setting and getting content from Clipboard on both iOS and Android

Methods #

static getString(0) #

Get content of string type, this method returns a Promise, so you can use following code to get clipboard content

async _getContent() { +Clipboard – React Native | A framework for building native apps using React
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Clipboard #

Edit on GitHub

Clipboard gives you an interface for setting and getting content from Clipboard on both iOS and Android

Methods #

static getString(0) #

Get content of string type, this method returns a Promise, so you can use following code to get clipboard content

async _getContent() { var content = await Clipboard.getString(); }

static setString(content) #

Set content of string type. You can use following code to set clipboard content

_setContent() { Clipboard.setString('hello world'); -}

@param the content to be stored in the clipboard.

Examples #

Edit on GitHub
'use strict'; +}

@param the content to be stored in the clipboard.

Examples #

Edit on GitHub
'use strict'; var React = require('react'); var ReactNative = require('react-native'); @@ -68,6 +68,6 @@ exports.examples \ No newline at end of file diff --git a/docs/colors.html b/docs/colors.html index c1e46285a0d..acaf89ff5f4 100644 --- a/docs/colors.html +++ b/docs/colors.html @@ -1,4 +1,4 @@ -Colors – React Native | A framework for building native apps using React
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Colors #

Edit on GitHub

The following formats are supported:

  • '#f0f' (#rgb)
  • '#f0fc' (#rgba)
  • '#ff00ff' (#rrggbb)
  • '#ff00ff00' (#rrggbbaa)
  • 'rgb(255, 255, 255)'
  • 'rgba(255, 255, 255, 1.0)'
  • 'hsl(360, 100%, 100%)'
  • 'hsla(360, 100%, 100%, 1.0)'
  • 'transparent'
  • 'red'
  • 0xff00ff00 (0xrrggbbaa)

For the named colors, React Native follows the CSS3 specification:

  • aliceblue (#f0f8ff)
  • antiquewhite (#faebd7)
  • aqua (#00ffff)
  • aquamarine (#7fffd4)
  • azure (#f0ffff)
  • beige (#f5f5dc)
  • bisque (#ffe4c4)
  • black (#000000)
  • blanchedalmond (#ffebcd)
  • blue (#0000ff)
  • blueviolet (#8a2be2)
  • brown (#a52a2a)
  • burlywood (#deb887)
  • cadetblue (#5f9ea0)
  • chartreuse (#7fff00)
  • chocolate (#d2691e)
  • coral (#ff7f50)
  • cornflowerblue (#6495ed)
  • cornsilk (#fff8dc)
  • crimson (#dc143c)
  • cyan (#00ffff)
  • darkblue (#00008b)
  • darkcyan (#008b8b)
  • darkgoldenrod (#b8860b)
  • darkgray (#a9a9a9)
  • darkgreen (#006400)
  • darkgrey (#a9a9a9)
  • darkkhaki (#bdb76b)
  • darkmagenta (#8b008b)
  • darkolivegreen (#556b2f)
  • darkorange (#ff8c00)
  • darkorchid (#9932cc)
  • darkred (#8b0000)
  • darksalmon (#e9967a)
  • darkseagreen (#8fbc8f)
  • darkslateblue (#483d8b)
  • darkslategray (#2f4f4f)
  • darkslategrey (#2f4f4f)
  • darkturquoise (#00ced1)
  • darkviolet (#9400d3)
  • deeppink (#ff1493)
  • deepskyblue (#00bfff)
  • dimgray (#696969)
  • dimgrey (#696969)
  • dodgerblue (#1e90ff)
  • firebrick (#b22222)
  • floralwhite (#fffaf0)
  • forestgreen (#228b22)
  • fuchsia (#ff00ff)
  • gainsboro (#dcdcdc)
  • ghostwhite (#f8f8ff)
  • gold (#ffd700)
  • goldenrod (#daa520)
  • gray (#808080)
  • green (#008000)
  • greenyellow (#adff2f)
  • grey (#808080)
  • honeydew (#f0fff0)
  • hotpink (#ff69b4)
  • indianred (#cd5c5c)
  • indigo (#4b0082)
  • ivory (#fffff0)
  • khaki (#f0e68c)
  • lavender (#e6e6fa)
  • lavenderblush (#fff0f5)
  • lawngreen (#7cfc00)
  • lemonchiffon (#fffacd)
  • lightblue (#add8e6)
  • lightcoral (#f08080)
  • lightcyan (#e0ffff)
  • lightgoldenrodyellow (#fafad2)
  • lightgray (#d3d3d3)
  • lightgreen (#90ee90)
  • lightgrey (#d3d3d3)
  • lightpink (#ffb6c1)
  • lightsalmon (#ffa07a)
  • lightseagreen (#20b2aa)
  • lightskyblue (#87cefa)
  • lightslategray (#778899)
  • lightslategrey (#778899)
  • lightsteelblue (#b0c4de)
  • lightyellow (#ffffe0)
  • lime (#00ff00)
  • limegreen (#32cd32)
  • linen (#faf0e6)
  • magenta (#ff00ff)
  • maroon (#800000)
  • mediumaquamarine (#66cdaa)
  • mediumblue (#0000cd)
  • mediumorchid (#ba55d3)
  • mediumpurple (#9370db)
  • mediumseagreen (#3cb371)
  • mediumslateblue (#7b68ee)
  • mediumspringgreen (#00fa9a)
  • mediumturquoise (#48d1cc)
  • mediumvioletred (#c71585)
  • midnightblue (#191970)
  • mintcream (#f5fffa)
  • mistyrose (#ffe4e1)
  • moccasin (#ffe4b5)
  • navajowhite (#ffdead)
  • navy (#000080)
  • oldlace (#fdf5e6)
  • olive (#808000)
  • olivedrab (#6b8e23)
  • orange (#ffa500)
  • orangered (#ff4500)
  • orchid (#da70d6)
  • palegoldenrod (#eee8aa)
  • palegreen (#98fb98)
  • paleturquoise (#afeeee)
  • palevioletred (#db7093)
  • papayawhip (#ffefd5)
  • peachpuff (#ffdab9)
  • peru (#cd853f)
  • pink (#ffc0cb)
  • plum (#dda0dd)
  • powderblue (#b0e0e6)
  • purple (#800080)
  • rebeccapurple (#663399)
  • red (#ff0000)
  • rosybrown (#bc8f8f)
  • royalblue (#4169e1)
  • saddlebrown (#8b4513)
  • salmon (#fa8072)
  • sandybrown (#f4a460)
  • seagreen (#2e8b57)
  • seashell (#fff5ee)
  • sienna (#a0522d)
  • silver (#c0c0c0)
  • skyblue (#87ceeb)
  • slateblue (#6a5acd)
  • slategray (#708090)
  • slategrey (#708090)
  • snow (#fffafa)
  • springgreen (#00ff7f)
  • steelblue (#4682b4)
  • tan (#d2b48c)
  • teal (#008080)
  • thistle (#d8bfd8)
  • tomato (#ff6347)
  • turquoise (#40e0d0)
  • violet (#ee82ee)
  • wheat (#f5deb3)
  • white (#ffffff)
  • whitesmoke (#f5f5f5)
  • yellow (#ffff00)
  • yellowgreen (#9acd32)
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Colors #

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The following formats are supported:

  • '#f0f' (#rgb)
  • '#f0fc' (#rgba)
  • '#ff00ff' (#rrggbb)
  • '#ff00ff00' (#rrggbbaa)
  • 'rgb(255, 255, 255)'
  • 'rgba(255, 255, 255, 1.0)'
  • 'hsl(360, 100%, 100%)'
  • 'hsla(360, 100%, 100%, 1.0)'
  • 'transparent'
  • 'red'
  • 0xff00ff00 (0xrrggbbaa)

For the named colors, React Native follows the CSS3 specification:

  • aliceblue (#f0f8ff)
  • antiquewhite (#faebd7)
  • aqua (#00ffff)
  • aquamarine (#7fffd4)
  • azure (#f0ffff)
  • beige (#f5f5dc)
  • bisque (#ffe4c4)
  • black (#000000)
  • blanchedalmond (#ffebcd)
  • blue (#0000ff)
  • blueviolet (#8a2be2)
  • brown (#a52a2a)
  • burlywood (#deb887)
  • cadetblue (#5f9ea0)
  • chartreuse (#7fff00)
  • chocolate (#d2691e)
  • coral (#ff7f50)
  • cornflowerblue (#6495ed)
  • cornsilk (#fff8dc)
  • crimson (#dc143c)
  • cyan (#00ffff)
  • darkblue (#00008b)
  • darkcyan (#008b8b)
  • darkgoldenrod (#b8860b)
  • darkgray (#a9a9a9)
  • darkgreen (#006400)
  • darkgrey (#a9a9a9)
  • darkkhaki (#bdb76b)
  • darkmagenta (#8b008b)
  • darkolivegreen (#556b2f)
  • darkorange (#ff8c00)
  • darkorchid (#9932cc)
  • darkred (#8b0000)
  • darksalmon (#e9967a)
  • darkseagreen (#8fbc8f)
  • darkslateblue (#483d8b)
  • darkslategray (#2f4f4f)
  • darkslategrey (#2f4f4f)
  • darkturquoise (#00ced1)
  • darkviolet (#9400d3)
  • deeppink (#ff1493)
  • deepskyblue (#00bfff)
  • dimgray (#696969)
  • dimgrey (#696969)
  • dodgerblue (#1e90ff)
  • firebrick (#b22222)
  • floralwhite (#fffaf0)
  • forestgreen (#228b22)
  • fuchsia (#ff00ff)
  • gainsboro (#dcdcdc)
  • ghostwhite (#f8f8ff)
  • gold (#ffd700)
  • goldenrod (#daa520)
  • gray (#808080)
  • green (#008000)
  • greenyellow (#adff2f)
  • grey (#808080)
  • honeydew (#f0fff0)
  • hotpink (#ff69b4)
  • indianred (#cd5c5c)
  • indigo (#4b0082)
  • ivory (#fffff0)
  • khaki (#f0e68c)
  • lavender (#e6e6fa)
  • lavenderblush (#fff0f5)
  • lawngreen (#7cfc00)
  • lemonchiffon (#fffacd)
  • lightblue (#add8e6)
  • lightcoral (#f08080)
  • lightcyan (#e0ffff)
  • lightgoldenrodyellow (#fafad2)
  • lightgray (#d3d3d3)
  • lightgreen (#90ee90)
  • lightgrey (#d3d3d3)
  • lightpink (#ffb6c1)
  • lightsalmon (#ffa07a)
  • lightseagreen (#20b2aa)
  • lightskyblue (#87cefa)
  • lightslategray (#778899)
  • lightslategrey (#778899)
  • lightsteelblue (#b0c4de)
  • lightyellow (#ffffe0)
  • lime (#00ff00)
  • limegreen (#32cd32)
  • linen (#faf0e6)
  • magenta (#ff00ff)
  • maroon (#800000)
  • mediumaquamarine (#66cdaa)
  • mediumblue (#0000cd)
  • mediumorchid (#ba55d3)
  • mediumpurple (#9370db)
  • mediumseagreen (#3cb371)
  • mediumslateblue (#7b68ee)
  • mediumspringgreen (#00fa9a)
  • mediumturquoise (#48d1cc)
  • mediumvioletred (#c71585)
  • midnightblue (#191970)
  • mintcream (#f5fffa)
  • mistyrose (#ffe4e1)
  • moccasin (#ffe4b5)
  • navajowhite (#ffdead)
  • navy (#000080)
  • oldlace (#fdf5e6)
  • olive (#808000)
  • olivedrab (#6b8e23)
  • orange (#ffa500)
  • orangered (#ff4500)
  • orchid (#da70d6)
  • palegoldenrod (#eee8aa)
  • palegreen (#98fb98)
  • paleturquoise (#afeeee)
  • palevioletred (#db7093)
  • papayawhip (#ffefd5)
  • peachpuff (#ffdab9)
  • peru (#cd853f)
  • pink (#ffc0cb)
  • plum (#dda0dd)
  • powderblue (#b0e0e6)
  • purple (#800080)
  • rebeccapurple (#663399)
  • red (#ff0000)
  • rosybrown (#bc8f8f)
  • royalblue (#4169e1)
  • saddlebrown (#8b4513)
  • salmon (#fa8072)
  • sandybrown (#f4a460)
  • seagreen (#2e8b57)
  • seashell (#fff5ee)
  • sienna (#a0522d)
  • silver (#c0c0c0)
  • skyblue (#87ceeb)
  • slateblue (#6a5acd)
  • slategray (#708090)
  • slategrey (#708090)
  • snow (#fffafa)
  • springgreen (#00ff7f)
  • steelblue (#4682b4)
  • tan (#d2b48c)
  • teal (#008080)
  • thistle (#d8bfd8)
  • tomato (#ff6347)
  • turquoise (#40e0d0)
  • violet (#ee82ee)
  • wheat (#f5deb3)
  • white (#ffffff)
  • whitesmoke (#f5f5f5)
  • yellow (#ffff00)
  • yellowgreen (#9acd32)
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\ No newline at end of file diff --git a/docs/communication-ios.html b/docs/communication-ios.html index 2712ed7e6c2..dd8c5581884 100644 --- a/docs/communication-ios.html +++ b/docs/communication-ios.html @@ -1,4 +1,4 @@ -Communication between native and React Native – React Native | A framework for building native apps using React
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Communication between native and React Native #

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In Integrating with Existing Apps guide and Native UI Components guide we learn how to embed React Native in a native component and vice versa. When we mix native and React Native components, we'll eventually find a need to communicate between these two worlds. Some ways to achieve that have been already mentioned in other guides. This article summarizes available techniques.

Introduction #

React Native is inspired by React, so the basic idea of the information flow is similar. The flow in React is one-directional. We maintain a hierarchy of components, in which each component depends only on its parent and own internal state. We do this with properties: data is passed from a parent to its children in a top-down manner. If we have an ancestor component that rely on the state of its descendant, the recommended solution would be to pass down a callback that would be used by the descendant to update the ancestor.

The same concept applies to React Native. As long as we are building our application purely within the framework, we can drive our app with properties and callbacks. But, when we mix React Native and native components, we need some special, cross-language mechanisms that would allow us to pass information between them.

Properties #

Properties are the simplest way of cross-component communication. So we need a way to pass properties both from native to React Native, and from React Native to native.

Passing properties from native to React Native #

In order to embed a React Native view in a native component, we use RCTRootView. RCTRootView is a UIView that holds a React Native app. It also provides an interface between native side and the hosted app.

RCTRootView has an initializer that allows you to pass arbitrary properties down to the React Native app. The initialProperties parameter has to be an instance of NSDictionary. The dictionary is internally converted into a JSON object that the top-level JS component can reference.

NSArray *imageList = @[@"http://foo.com/bar1.png", +Communication between native and React Native – React Native | A framework for building native apps using React
React Native0.30

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Communication between native and React Native #

Edit on GitHub

In Integrating with Existing Apps guide and Native UI Components guide we learn how to embed React Native in a native component and vice versa. When we mix native and React Native components, we'll eventually find a need to communicate between these two worlds. Some ways to achieve that have been already mentioned in other guides. This article summarizes available techniques.

Introduction #

React Native is inspired by React, so the basic idea of the information flow is similar. The flow in React is one-directional. We maintain a hierarchy of components, in which each component depends only on its parent and own internal state. We do this with properties: data is passed from a parent to its children in a top-down manner. If we have an ancestor component that rely on the state of its descendant, the recommended solution would be to pass down a callback that would be used by the descendant to update the ancestor.

The same concept applies to React Native. As long as we are building our application purely within the framework, we can drive our app with properties and callbacks. But, when we mix React Native and native components, we need some special, cross-language mechanisms that would allow us to pass information between them.

Properties #

Properties are the simplest way of cross-component communication. So we need a way to pass properties both from native to React Native, and from React Native to native.

Passing properties from native to React Native #

In order to embed a React Native view in a native component, we use RCTRootView. RCTRootView is a UIView that holds a React Native app. It also provides an interface between native side and the hosted app.

RCTRootView has an initializer that allows you to pass arbitrary properties down to the React Native app. The initialProperties parameter has to be an instance of NSDictionary. The dictionary is internally converted into a JSON object that the top-level JS component can reference.

NSArray *imageList = @[@"http://foo.com/bar1.png", @"http://foo.com/bar2.png"]; NSDictionary *props = @{@"images" : imageList}; @@ -42,7 +42,7 @@ All native modules share the same namespace. Watch out for name collisions when RCTRootView *rootView = [[RCTRootView alloc] initWithBridge:bridge moduleName:appName initialProperties:props]; - rootView.frame = CGMakeRect(0, 0, self.view.width, 200); + rootView.frame = CGRectMake(0, 0, self.view.width, 200); [self.view addSubview:rootView]; }

When we have a fixed size root view, we need to respect its bounds on the JS side. In other words, we need to ensure that the React Native content can be contained within the fixed-size root view. The easiest way to ensure this is to use flexbox layout. If you use absolute positioning, and React components are visible outside the root view's bounds, you'll get overlap with native views, causing some features to behave unexpectedly. For instance, 'TouchableHighlight' will not highlight your touches outside the root view's bounds.

It's totally fine to update root view's size dynamically by re-setting its frame property. React Native will take care of the content's layout.

React Native content with flexible size #

In some cases we'd like to render content of initially unknown size. Let's say the size will be defined dynamically in JS. We have two solutions to this problem.

  1. You can wrap your React Native view in ScrollView component. This guarantees that your content will always be available and it won't overlap with native views.
  2. React Native allows you to determine, in JS, the size of the RN app and provide it to the owner of the hosting RCTRootView. The owner is then responsible for re-laying out the subviews and keeping the UI consistent. We achieve this with RCTRootView's flexibility modes.

RCTRootView supports 4 different size flexibility modes:

// RCTRootView.h @@ -90,6 +90,6 @@ Making a dimension flexible in both JS and native leads to undefined behavior. F apiKey: '2c98749b4a1e588efec53b2acec13025', indexName: 'react-native-versions', inputSelector: '#algolia-doc-search', - algoliaOptions: { facetFilters: [ "tags:0.29" ], hitsPerPage: 5 } + algoliaOptions: { facetFilters: [ "tags:0.30" ], hitsPerPage: 5 } }); \ No newline at end of file diff --git a/docs/datepickerandroid.html b/docs/datepickerandroid.html index bf2202d018a..0dca286e000 100644 --- a/docs/datepickerandroid.html +++ b/docs/datepickerandroid.html @@ -1,4 +1,4 @@ -DatePickerAndroid – React Native | A framework for building native apps using React
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DatePickerAndroid #

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Opens the standard Android date picker dialog.

Example #

try { +DatePickerAndroid – React Native | A framework for building native apps using React
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DatePickerAndroid #

Edit on GitHub

Opens the standard Android date picker dialog.

Example #

try { const {action, year, month, day} = await DatePickerAndroid.open({ // Use `new Date()` for current date. // May 25 2020. Month 0 is January. @@ -16,7 +16,7 @@ day if the user picked a date. If the user dismissed the dialog, the Promise will still be resolved with action being DatePickerAndroid.dismissedAction and all the other keys being undefined. Always check whether the action before reading the values.

Note the native date picker dialog has some UI glitches on Android 4 and lower -when using the minDate and maxDate options.

static dateSetAction(0) #

A date has been selected.

static dismissedAction(0) #

The dialog has been dismissed.

Examples #

Edit on GitHub
'use strict'; +when using the minDate and maxDate options.

static dateSetAction(0) #

A date has been selected.

static dismissedAction(0) #

The dialog has been dismissed.

Examples #

Edit on GitHub
'use strict'; var React = require('react'); var ReactNative = require('react-native'); @@ -136,6 +136,6 @@ module.exports \ No newline at end of file diff --git a/docs/datepickerios.html b/docs/datepickerios.html index f3b57d95069..94ab7fbf00b 100644 --- a/docs/datepickerios.html +++ b/docs/datepickerios.html @@ -1,12 +1,12 @@ -DatePickerIOS – React Native | A framework for building native apps using React
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DatePickerIOS #

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Use DatePickerIOS to render a date/time picker (selector) on iOS. This is +DatePickerIOS – React Native | A framework for building native apps using React

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DatePickerIOS #

Edit on GitHub

Use DatePickerIOS to render a date/time picker (selector) on iOS. This is a controlled component, so you must hook in to the onDateChange callback and update the date prop in order for the component to update, otherwise the user's change will be reverted immediately to reflect props.date as the -source of truth.

Props #

View props... #

date Date #

The currently selected date.

maximumDate Date #

Maximum date.

Restricts the range of possible date/time values.

minimumDate Date #

Minimum date.

Restricts the range of possible date/time values.

minuteInterval enum(1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30) #

The interval at which minutes can be selected.

mode enum('date', 'time', 'datetime') #

The date picker mode.

onDateChange function #

Date change handler.

This is called when the user changes the date or time in the UI. +source of truth.

Props #

View props... #

date PropTypes.instanceOf(Date).isRequired #

The currently selected date.

maximumDate PropTypes.instanceOf(Date) #

Maximum date.

Restricts the range of possible date/time values.

minimumDate PropTypes.instanceOf(Date) #

Minimum date.

Restricts the range of possible date/time values.

minuteInterval PropTypes.oneOf([1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30]) #

The interval at which minutes can be selected.

mode PropTypes.oneOf(['date', 'time', 'datetime']) #

The date picker mode.

onDateChange PropTypes.func.isRequired #

Date change handler.

This is called when the user changes the date or time in the UI. The first and only argument is a Date object representing the new -date and time.

timeZoneOffsetInMinutes number #

Timezone offset in minutes.

By default, the date picker will use the device's timezone. With this +date and time.

timeZoneOffsetInMinutes PropTypes.number #

Timezone offset in minutes.

By default, the date picker will use the device's timezone. With this parameter, it is possible to force a certain timezone offset. For -instance, to show times in Pacific Standard Time, pass -7 * 60.

Examples #

Edit on GitHub
'use strict'; +instance, to show times in Pacific Standard Time, pass -7 * 60.

Examples #

Edit on GitHub
'use strict'; var React = require('react'); var ReactNative = require('react-native'); @@ -175,6 +175,6 @@ exports.examples \ No newline at end of file diff --git a/docs/debugging.html b/docs/debugging.html index 2a1f94cc9fc..2d30215793c 100644 --- a/docs/debugging.html +++ b/docs/debugging.html @@ -1,4 +1,4 @@ -Debugging – React Native | A framework for building native apps using React
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Debugging #

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Accessing the In-App Developer Menu #

You can access the developer menu by shaking your device or by selecting "Shake Gesture" inside the Hardware menu in the iOS Simulator. You can also use the Command⌘ + D keyboard shortcut when your app is running in the iPhone Simulator, or Command⌘ + M when running in an Android emulator.

The Developer Menu is disabled in release (production) builds.

Reloading JavaScript #

Instead of recompiling your app every time you make a change, you can reload your app's JavaScript code instantly. To do so, select "Reload" from the Developer Menu. You can also press Command⌘ + R in the iOS Simulator, or press R twice on Android emulators.

If the Command⌘ + R keyboard shortcut does not seem to reload the iOS Simulator, go to the Hardware menu, select Keyboard, and make sure that "Connect Hardware Keyboard" is checked.

Automatic reloading #

You can speed up your development times by having your app reload automatically any time your code changes. Automatic reloading can be enabled by selecting "Enable Live Reload" from the Developer Menu.

You may even go a step further and keep your app running as new versions of your files are injected into the JavaScript bundle automatically by enabling Hot Reloading from the Developer Menu. This will allow you to persist the app's state through reloads.

There are some instances where hot reloading cannot be implemented perfectly. If you run into any issues, use a full reload to reset your app.

You will need to rebuild your app for changes to take effect in certain situations:

  • You have added new resources to your native app's bundle, such as an image in Images.xcassets on iOS or the res/drawable folder on Android.
  • You have modified native code (Objective-C/Swift on iOS or Java/C++ on Android).

In-app Errors and Warnings #

Errors and warnings are displayed inside your app in development builds.

Errors #

In-app errors are displayed in a full screen alert with a red background inside your app. This screen is known as a RedBox. You can use console.error() to manually trigger one.

Warnings #

Warnings will be displayed on screen with a yellow background. These alerts are known as YellowBoxes. Click on the alerts to show more information or to dismiss them.

As with a RedBox, you can use console.warn() to trigger a YellowBox.

YellowBoxes can be disabled during development by using console.disableYellowBox = true;. Specific warnings can be ignored programmatically by setting an array of prefixes that should be ignored: console.ignoredYellowBox = ['Warning: ...'];

RedBoxes and YellowBoxes are automatically disabled in release (production) builds.

Accessing console logs #

You can display the console logs for an iOS or Android app by using the following commands in a terminal while the app is running:

$ react-native log-ios +Debugging – React Native | A framework for building native apps using React
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Debugging #

Edit on GitHub

Accessing the In-App Developer Menu #

You can access the developer menu by shaking your device or by selecting "Shake Gesture" inside the Hardware menu in the iOS Simulator. You can also use the Command⌘ + D keyboard shortcut when your app is running in the iPhone Simulator, or Command⌘ + M when running in an Android emulator.

The Developer Menu is disabled in release (production) builds.

Reloading JavaScript #

Instead of recompiling your app every time you make a change, you can reload your app's JavaScript code instantly. To do so, select "Reload" from the Developer Menu. You can also press Command⌘ + R in the iOS Simulator, or press R twice on Android emulators.

If the Command⌘ + R keyboard shortcut does not seem to reload the iOS Simulator, go to the Hardware menu, select Keyboard, and make sure that "Connect Hardware Keyboard" is checked.

Automatic reloading #

You can speed up your development times by having your app reload automatically any time your code changes. Automatic reloading can be enabled by selecting "Enable Live Reload" from the Developer Menu.

You may even go a step further and keep your app running as new versions of your files are injected into the JavaScript bundle automatically by enabling Hot Reloading from the Developer Menu. This will allow you to persist the app's state through reloads.

There are some instances where hot reloading cannot be implemented perfectly. If you run into any issues, use a full reload to reset your app.

You will need to rebuild your app for changes to take effect in certain situations:

  • You have added new resources to your native app's bundle, such as an image in Images.xcassets on iOS or the res/drawable folder on Android.
  • You have modified native code (Objective-C/Swift on iOS or Java/C++ on Android).

In-app Errors and Warnings #

Errors and warnings are displayed inside your app in development builds.

Errors #

In-app errors are displayed in a full screen alert with a red background inside your app. This screen is known as a RedBox. You can use console.error() to manually trigger one.

Warnings #

Warnings will be displayed on screen with a yellow background. These alerts are known as YellowBoxes. Click on the alerts to show more information or to dismiss them.

As with a RedBox, you can use console.warn() to trigger a YellowBox.

YellowBoxes can be disabled during development by using console.disableYellowBox = true;. Specific warnings can be ignored programmatically by setting an array of prefixes that should be ignored: console.ignoredYellowBox = ['Warning: ...'];

RedBoxes and YellowBoxes are automatically disabled in release (production) builds.

Accessing console logs #

You can display the console logs for an iOS or Android app by using the following commands in a terminal while the app is running:

$ react-native log-ios $ react-native log-android

You may also access these through Debug → Open System Log... in the iOS Simulator or by running adb logcat *:S ReactNative:V ReactNativeJS:V in a terminal while an Android app is running on a device or emulator.

Chrome Developer Tools #

To debug the JavaScript code in Chrome, select "Debug JS Remotely" from the Developer Menu. This will open a new tab at http://localhost:8081/debugger-ui.

Select Tools → Developer Tools from the Chrome Menu to open the Developer Tools. You may also access the DevTools using keyboard shortcuts (Command⌘ + Option⌥ + I on Mac, Ctrl + Shift + I on Windows). You may also want to enable Pause On Caught Exceptions for a better debugging experience.

It is currently not possible to use the "React" tab in the Chrome Developer Tools to inspect app widgets. You can use Nuclide's "React Native Inspector" as a workaround.

Debugging on a device with Chrome Developer Tools #

On iOS devices, open the file RCTWebSocketExecutor.m and change "localhost" to the IP address of your computer, then select "Debug JS Remotely" from the Developer Menu.

On Android 5.0+ devices connected via USB, you can use the adb command line tool to setup port forwarding from the device to your computer:

adb reverse tcp:8081 tcp:8081

Alternatively, select "Dev Settings" from the Developer Menu, then update the "Debug server host for device" setting to match the IP address of your computer.

If you run into any issues, it may be possible that one of your Chrome extensions is interacting in unexpected ways with the debugger. Try disabling all of your extensions and re-enabling them one-by-one until you find the problematic extension.

Debugging using a custom JavaScript debugger #

To use a custom JavaScript debugger in place of Chrome Developer Tools, set the REACT_DEBUGGER environment variable to a command that will start your custom debugger. You can then select "Debug JS Remotely" from the Developer Menu to start debugging.

The debugger will receive a list of all project roots, separated by a space. For example, if you set REACT_DEBUGGER="node /path/to/launchDebugger.js --port 2345 --type ReactNative", then the command node /path/to/launchDebugger.js --port 2345 --type ReactNative /path/to/reactNative/app will be used to start your debugger.

Custom debugger commands executed this way should be short-lived processes, and they shouldn't produce more than 200 kilobytes of output.

Performance Monitor #

You can enable a performance overlay to help you debug performance problems by selecting "Perf Monitor" in the Developer Menu.

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\ No newline at end of file diff --git a/docs/dimensions.html b/docs/dimensions.html index 3242113efd8..089e5ff035e 100644 --- a/docs/dimensions.html +++ b/docs/dimensions.html @@ -1,4 +1,4 @@ -Dimensions – React Native | A framework for building native apps using React
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Dimensions #

Edit on GitHub

Methods #

static set(dims) #

This should only be called from native code by sending the +Dimensions – React Native | A framework for building native apps using React

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Dimensions #

Edit on GitHub

Methods #

static set(dims) #

This should only be called from native code by sending the didUpdateDimensions event.

@param {object} dims Simple string-keyed object of dimensions to set

static get(dim) #

Initial dimensions are set before runApplication is called so they should be available before any other require's are run, but may be updated later.

Note: Although dimensions are available immediately, they may change (e.g due to device rotation) so any rendering logic or styles that depend on @@ -21,6 +21,6 @@ setting a value in a StyleSheet).

Example: var {height, apiKey: '2c98749b4a1e588efec53b2acec13025', indexName: 'react-native-versions', inputSelector: '#algolia-doc-search', - algoliaOptions: { facetFilters: [ "tags:0.29" ], hitsPerPage: 5 } + algoliaOptions: { facetFilters: [ "tags:0.30" ], hitsPerPage: 5 } }); \ No newline at end of file diff --git a/docs/direct-manipulation.html b/docs/direct-manipulation.html index 9a34c8f0c00..2c036cc02fb 100644 --- a/docs/direct-manipulation.html +++ b/docs/direct-manipulation.html @@ -1,4 +1,4 @@ -Direct Manipulation – React Native | A framework for building native apps using React

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Direct Manipulation #

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It is sometimes necessary to make changes directly to a component +Direct Manipulation – React Native | A framework for building native apps using React

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Direct Manipulation #

Edit on GitHub

It is sometimes necessary to make changes directly to a component without using state/props to trigger a re-render of the entire subtree. When using React in the browser for example, you sometimes need to directly modify a DOM node, and the same is true for views in mobile @@ -152,6 +152,6 @@ use setState instead of setNativeProps.

\ No newline at end of file diff --git a/docs/drawerlayoutandroid.html b/docs/drawerlayoutandroid.html index ffebfafdbc7..8c71ae2a946 100644 --- a/docs/drawerlayoutandroid.html +++ b/docs/drawerlayoutandroid.html @@ -1,4 +1,4 @@ -DrawerLayoutAndroid – React Native | A framework for building native apps using React
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DrawerLayoutAndroid #

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React component that wraps the platform DrawerLayout (Android only). The +DrawerLayoutAndroid – React Native | A framework for building native apps using React

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DrawerLayoutAndroid #

Edit on GitHub

React component that wraps the platform DrawerLayout (Android only). The Drawer (typically used for navigation) is rendered with renderNavigationView and direct children are the main view (where your content goes). The navigation view is initially not visible on the screen, but can be pulled in from the @@ -24,18 +24,28 @@ be set by the drawerWidth prop.

Example:

return ( <DrawerLayoutAndroid drawerBackgroundColor="rgba(0,0,0,0.5)"> </DrawerLayoutAndroid> -);

drawerLockMode enum('unlocked', 'locked-closed', 'locked-open') #

Specifies the lock mode of the drawer. The drawer can be locked in 3 states: +);

drawerLockMode ReactPropTypes.oneOf([ + 'unlocked', + 'locked-closed', + 'locked-open' +]) #

Specifies the lock mode of the drawer. The drawer can be locked in 3 states: - unlocked (default), meaning that the drawer will respond (open/close) to touch gestures. - locked-closed, meaning that the drawer will stay closed and not respond to gestures. - locked-open, meaning that the drawer will stay opened and not respond to gestures. -The drawer may still be opened and closed programmatically (openDrawer/closeDrawer).

drawerPosition enum(DrawerConsts.DrawerPosition.Left, DrawerConsts.DrawerPosition.Right) #

Specifies the side of the screen from which the drawer will slide in.

drawerWidth number #

Specifies the width of the drawer, more precisely the width of the view that be pulled in -from the edge of the window.

keyboardDismissMode enum('none', 'on-drag') #

Determines whether the keyboard gets dismissed in response to a drag. +The drawer may still be opened and closed programmatically (openDrawer/closeDrawer).

drawerPosition ReactPropTypes.oneOf([ + DrawerConsts.DrawerPosition.Left, + DrawerConsts.DrawerPosition.Right +]) #

Specifies the side of the screen from which the drawer will slide in.

drawerWidth ReactPropTypes.number #

Specifies the width of the drawer, more precisely the width of the view that be pulled in +from the edge of the window.

keyboardDismissMode ReactPropTypes.oneOf([ + 'none', // default + 'on-drag', +]) #

Determines whether the keyboard gets dismissed in response to a drag. - 'none' (the default), drags do not dismiss the keyboard. - - 'on-drag', the keyboard is dismissed when a drag begins.

onDrawerClose function #

Function called whenever the navigation view has been closed.

onDrawerOpen function #

Function called whenever the navigation view has been opened.

onDrawerSlide function #

Function called whenever there is an interaction with the navigation view.

onDrawerStateChanged function #

Function called when the drawer state has changed. The drawer can be in 3 states: + - 'on-drag', the keyboard is dismissed when a drag begins.

onDrawerClose ReactPropTypes.func #

Function called whenever the navigation view has been closed.

onDrawerOpen ReactPropTypes.func #

Function called whenever the navigation view has been opened.

onDrawerSlide ReactPropTypes.func #

Function called whenever there is an interaction with the navigation view.

onDrawerStateChanged ReactPropTypes.func #

Function called when the drawer state has changed. The drawer can be in 3 states: - idle, meaning there is no interaction with the navigation view happening at the time - dragging, meaning there is currently an interaction with the navigation view - settling, meaning that there was an interaction with the navigation view, and the -navigation view is now finishing its closing or opening animation

renderNavigationView function #

The navigation view that will be rendered to the side of the screen and can be pulled in.

statusBarBackgroundColor color #

Make the drawer take the entire screen and draw the background of the +navigation view is now finishing its closing or opening animation

renderNavigationView ReactPropTypes.func.isRequired #

The navigation view that will be rendered to the side of the screen and can be pulled in.

statusBarBackgroundColor color #

Make the drawer take the entire screen and draw the background of the status bar to allow it to open over the status bar. It will only have an effect on API 21+.

Methods #

openDrawer(0) #

Opens the drawer.

closeDrawer(0) #

Closes the drawer.

Next →
© 2016 Facebook Inc.
\ No newline at end of file diff --git a/docs/flexbox.html b/docs/flexbox.html index b20b55ba33b..8cd008f16f8 100644 --- a/docs/flexbox.html +++ b/docs/flexbox.html @@ -1,4 +1,4 @@ -Layout with Flexbox – React Native | A framework for building native apps using React
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Layout with Flexbox #

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A component can specify the layout of its children using the flexbox algorithm. Flexbox is designed to provide a consistent layout on different screen sizes.

You will normally use a combination of flexDirection, alignItems, and justifyContent to achieve the right layout.

Flexbox works the same way in React Native as it does in CSS on the web, with a few exceptions. The defaults are different, with flexDirection defaulting to column instead of row, and alignItems defaulting to stretch instead of flex-start, and the flex parameter only supports a single number.

Flex Direction #

Adding flexDirection to a component's style determines the primary axis of its layout. Should the children be organized horizontally (row) or vertically (column)? The default is column.

import React, { Component } from 'react'; +Layout with Flexbox – React Native | A framework for building native apps using React
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Layout with Flexbox #

Edit on GitHub

A component can specify the layout of its children using the flexbox algorithm. Flexbox is designed to provide a consistent layout on different screen sizes.

You will normally use a combination of flexDirection, alignItems, and justifyContent to achieve the right layout.

Flexbox works the same way in React Native as it does in CSS on the web, with a few exceptions. The defaults are different, with flexDirection defaulting to column instead of row, and alignItems defaulting to stretch instead of flex-start, and the flex parameter only supports a single number.

Flex Direction #

Adding flexDirection to a component's style determines the primary axis of its layout. Should the children be organized horizontally (row) or vertically (column)? The default is column.

import React, { Component } from 'react'; import { AppRegistry, View } from 'react-native'; class FlexDirectionBasics extends Component { @@ -74,6 +74,6 @@ AppRegistry. apiKey: '2c98749b4a1e588efec53b2acec13025', indexName: 'react-native-versions', inputSelector: '#algolia-doc-search', - algoliaOptions: { facetFilters: [ "tags:0.29" ], hitsPerPage: 5 } + algoliaOptions: { facetFilters: [ "tags:0.30" ], hitsPerPage: 5 } }); \ No newline at end of file diff --git a/docs/geolocation.html b/docs/geolocation.html index 1c137b0e2ee..211aebd001d 100644 --- a/docs/geolocation.html +++ b/docs/geolocation.html @@ -1,4 +1,4 @@ -Geolocation – React Native | A framework for building native apps using React
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Geolocation #

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The Geolocation API follows the web spec: +Geolocation – React Native | A framework for building native apps using React

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Geolocation #

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The Geolocation API follows the web spec: https://developer.mozilla.org/en-US/docs/Web/API/Geolocation

iOS #

You need to include the NSLocationWhenInUseUsageDescription key in Info.plist to enable geolocation. Geolocation is enabled by default when you create a project with react-native init.

Android #

To request access to location, you need to add the following line to your @@ -6,7 +6,7 @@ app's AndroidManifest.xml:

<uses-permission and options: timeout (ms), maximumAge (ms), enableHighAccuracy (bool) On Android, this can return almost immediately if the location is cached or request an update, which might take a while.

static watchPosition(success, error?, options?) #

Invokes the success callback whenever the location changes. Supported -options: timeout (ms), maximumAge (ms), enableHighAccuracy (bool), distanceFilter(m)

static clearWatch(watchID) #

static stopObserving(0) #

Examples #

Edit on GitHub
/* eslint no-console: 0 */ +options: timeout (ms), maximumAge (ms), enableHighAccuracy (bool), distanceFilter(m)

static clearWatch(watchID) #

static stopObserving(0) #

Examples #

Edit on GitHub
/* eslint no-console: 0 */ 'use strict'; @@ -96,6 +96,6 @@ exports.examples \ No newline at end of file diff --git a/docs/gesture-responder-system.html b/docs/gesture-responder-system.html index e0c2ab984a7..f08f0c51e3d 100644 --- a/docs/gesture-responder-system.html +++ b/docs/gesture-responder-system.html @@ -1,4 +1,4 @@ -Gesture Responder System – React Native | A framework for building native apps using React
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Gesture Responder System #

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Gesture recognition on mobile devices is much more complicated than web. A touch can go through several phases as the app determines what the user's intention is. For example, the app needs to determine if the touch is scrolling, sliding on a widget, or tapping. This can even change during the duration of a touch. There can also be multiple simultaneous touches.

The touch responder system is needed to allow components to negotiate these touch interactions without any additional knowledge about their parent or child components. This system is implemented in ResponderEventPlugin.js, which contains further details and documentation.

Best Practices #

Users can feel huge differences in the usability of web apps vs. native, and this is one of the big causes. Every action should have the following attributes:

  • Feedback/highlighting- show the user what is handling their touch, and what will happen when they release the gesture
  • Cancel-ability- when making an action, the user should be able to abort it mid-touch by dragging their finger away

These features make users more comfortable while using an app, because it allows people to experiment and interact without fear of making mistakes.

TouchableHighlight and Touchable* #

The responder system can be complicated to use. So we have provided an abstract Touchable implementation for things that should be "tappable". This uses the responder system and allows you to easily configure tap interactions declaratively. Use TouchableHighlight anywhere where you would use a button or link on web.

Responder Lifecycle #

A view can become the touch responder by implementing the correct negotiation methods. There are two methods to ask the view if it wants to become responder:

  • View.props.onStartShouldSetResponder: (evt) => true, - Does this view want to become responder on the start of a touch?
  • View.props.onMoveShouldSetResponder: (evt) => true, - Called for every touch move on the View when it is not the responder: does this view want to "claim" touch responsiveness?

If the View returns true and attempts to become the responder, one of the following will happen:

  • View.props.onResponderGrant: (evt) => {} - The View is now responding for touch events. This is the time to highlight and show the user what is happening
  • View.props.onResponderReject: (evt) => {} - Something else is the responder right now and will not release it

If the view is responding, the following handlers can be called:

  • View.props.onResponderMove: (evt) => {} - The user is moving their finger
  • View.props.onResponderRelease: (evt) => {} - Fired at the end of the touch, ie "touchUp"
  • View.props.onResponderTerminationRequest: (evt) => true - Something else wants to become responder. Should this view release the responder? Returning true allows release
  • View.props.onResponderTerminate: (evt) => {} - The responder has been taken from the View. Might be taken by other views after a call to onResponderTerminationRequest, or might be taken by the OS without asking (happens with control center/ notification center on iOS)

evt is a synthetic touch event with the following form:

  • nativeEvent
    • changedTouches - Array of all touch events that have changed since the last event
    • identifier - The ID of the touch
    • locationX - The X position of the touch, relative to the element
    • locationY - The Y position of the touch, relative to the element
    • pageX - The X position of the touch, relative to the root element
    • pageY - The Y position of the touch, relative to the root element
    • target - The node id of the element receiving the touch event
    • timestamp - A time identifier for the touch, useful for velocity calculation
    • touches - Array of all current touches on the screen

Capture ShouldSet Handlers #

onStartShouldSetResponder and onMoveShouldSetResponder are called with a bubbling pattern, where the deepest node is called first. That means that the deepest component will become responder when multiple Views return true for *ShouldSetResponder handlers. This is desirable in most cases, because it makes sure all controls and buttons are usable.

However, sometimes a parent will want to make sure that it becomes responder. This can be handled by using the capture phase. Before the responder system bubbles up from the deepest component, it will do a capture phase, firing on*ShouldSetResponderCapture. So if a parent View wants to prevent the child from becoming responder on a touch start, it should have a onStartShouldSetResponderCapture handler which returns true.

  • View.props.onStartShouldSetResponderCapture: (evt) => true,
  • View.props.onMoveShouldSetResponderCapture: (evt) => true,

PanResponder #

For higher-level gesture interpretation, check out PanResponder.

Next →

Recently, we have been working hard to make the documentation better based on your feedback. Your responses to this yes/no style survey will help us gauge whether we moved in the right direction with the improvements. Thank you!

Take Survey
© 2016 Facebook Inc.
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Gesture Responder System #

Edit on GitHub

Gesture recognition on mobile devices is much more complicated than web. A touch can go through several phases as the app determines what the user's intention is. For example, the app needs to determine if the touch is scrolling, sliding on a widget, or tapping. This can even change during the duration of a touch. There can also be multiple simultaneous touches.

The touch responder system is needed to allow components to negotiate these touch interactions without any additional knowledge about their parent or child components. This system is implemented in ResponderEventPlugin.js, which contains further details and documentation.

Best Practices #

Users can feel huge differences in the usability of web apps vs. native, and this is one of the big causes. Every action should have the following attributes:

  • Feedback/highlighting- show the user what is handling their touch, and what will happen when they release the gesture
  • Cancel-ability- when making an action, the user should be able to abort it mid-touch by dragging their finger away

These features make users more comfortable while using an app, because it allows people to experiment and interact without fear of making mistakes.

TouchableHighlight and Touchable* #

The responder system can be complicated to use. So we have provided an abstract Touchable implementation for things that should be "tappable". This uses the responder system and allows you to easily configure tap interactions declaratively. Use TouchableHighlight anywhere where you would use a button or link on web.

Responder Lifecycle #

A view can become the touch responder by implementing the correct negotiation methods. There are two methods to ask the view if it wants to become responder:

  • View.props.onStartShouldSetResponder: (evt) => true, - Does this view want to become responder on the start of a touch?
  • View.props.onMoveShouldSetResponder: (evt) => true, - Called for every touch move on the View when it is not the responder: does this view want to "claim" touch responsiveness?

If the View returns true and attempts to become the responder, one of the following will happen:

  • View.props.onResponderGrant: (evt) => {} - The View is now responding for touch events. This is the time to highlight and show the user what is happening
  • View.props.onResponderReject: (evt) => {} - Something else is the responder right now and will not release it

If the view is responding, the following handlers can be called:

  • View.props.onResponderMove: (evt) => {} - The user is moving their finger
  • View.props.onResponderRelease: (evt) => {} - Fired at the end of the touch, ie "touchUp"
  • View.props.onResponderTerminationRequest: (evt) => true - Something else wants to become responder. Should this view release the responder? Returning true allows release
  • View.props.onResponderTerminate: (evt) => {} - The responder has been taken from the View. Might be taken by other views after a call to onResponderTerminationRequest, or might be taken by the OS without asking (happens with control center/ notification center on iOS)

evt is a synthetic touch event with the following form:

  • nativeEvent
    • changedTouches - Array of all touch events that have changed since the last event
    • identifier - The ID of the touch
    • locationX - The X position of the touch, relative to the element
    • locationY - The Y position of the touch, relative to the element
    • pageX - The X position of the touch, relative to the root element
    • pageY - The Y position of the touch, relative to the root element
    • target - The node id of the element receiving the touch event
    • timestamp - A time identifier for the touch, useful for velocity calculation
    • touches - Array of all current touches on the screen

Capture ShouldSet Handlers #

onStartShouldSetResponder and onMoveShouldSetResponder are called with a bubbling pattern, where the deepest node is called first. That means that the deepest component will become responder when multiple Views return true for *ShouldSetResponder handlers. This is desirable in most cases, because it makes sure all controls and buttons are usable.

However, sometimes a parent will want to make sure that it becomes responder. This can be handled by using the capture phase. Before the responder system bubbles up from the deepest component, it will do a capture phase, firing on*ShouldSetResponderCapture. So if a parent View wants to prevent the child from becoming responder on a touch start, it should have a onStartShouldSetResponderCapture handler which returns true.

  • View.props.onStartShouldSetResponderCapture: (evt) => true,
  • View.props.onMoveShouldSetResponderCapture: (evt) => true,

PanResponder #

For higher-level gesture interpretation, check out PanResponder.

Next →

Recently, we have been working hard to make the documentation better based on your feedback. Your responses to this yes/no style survey will help us gauge whether we moved in the right direction with the improvements. Thank you!

Take Survey
© 2016 Facebook Inc.
\ No newline at end of file diff --git a/docs/getting-started.html b/docs/getting-started.html index 2da8c6575a9..35abd511ba0 100644 --- a/docs/getting-started.html +++ b/docs/getting-started.html @@ -1,4 +1,4 @@ -Getting Started – React Native | A framework for building native apps using React
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Getting Started #

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Welcome to React Native! This page will help you install React Native on +Getting Started – React Native | A framework for building native apps using React

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Getting Started #

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Welcome to React Native! This page will help you install React Native on your system, so that you can build apps with it right away. If you already have React Native installed, you can skip ahead to the Tutorial.

The instructions are a bit different depending on your development operating system, and whether you want to start developing for iOS or Android. If you @@ -211,6 +211,6 @@ if (!foundHash) { apiKey: '2c98749b4a1e588efec53b2acec13025', indexName: 'react-native-versions', inputSelector: '#algolia-doc-search', - algoliaOptions: { facetFilters: [ "tags:0.29" ], hitsPerPage: 5 } + algoliaOptions: { facetFilters: [ "tags:0.30" ], hitsPerPage: 5 } }); \ No newline at end of file diff --git a/docs/handling-text-input.html b/docs/handling-text-input.html index 1c46ac8d53d..7821e1d206e 100644 --- a/docs/handling-text-input.html +++ b/docs/handling-text-input.html @@ -1,4 +1,4 @@ -Handling Text Input – React Native | A framework for building native apps using React

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Handling Text Input #

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TextInput is a basic component that allows the user to enter text. It has an onChangeText prop that takes +Handling Text Input – React Native | A framework for building native apps using React

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Handling Text Input #

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TextInput is a basic component that allows the user to enter text. It has an onChangeText prop that takes a function to be called every time the text changed, and an onSubmitEditing prop that takes a function to be called when the text is submitted.

For example, let's say that as the user types, you're translating their words into a different language. In this new language, every single word is written the same way: 🍕. So the sentence "Hello there Bob" would be translated as "🍕🍕🍕".

import React, { Component } from 'react'; import { AppRegistry, Text, TextInput, View } from 'react-native'; @@ -41,6 +41,6 @@ AppRegistry. apiKey: '2c98749b4a1e588efec53b2acec13025', indexName: 'react-native-versions', inputSelector: '#algolia-doc-search', - algoliaOptions: { facetFilters: [ "tags:0.29" ], hitsPerPage: 5 } + algoliaOptions: { facetFilters: [ "tags:0.30" ], hitsPerPage: 5 } }); \ No newline at end of file diff --git a/docs/handling-touches.html b/docs/handling-touches.html index 24c6b2d8283..43e8bd4ce77 100644 --- a/docs/handling-touches.html +++ b/docs/handling-touches.html @@ -1,4 +1,4 @@ -Handling Touches – React Native | A framework for building native apps using React
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Handling Touches #

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Users interact with mobile apps mainly through touch. They can use a combination of gestures, such as tapping on a button, scrolling a list, or zooming on a map.

React Native provides components to handle common gestures, such as taps and swipes, as well as a comprehensive gesture responder system to allow for more advanced gesture recognition.

Tappable Components #

You can use "Touchable" components when you want to capture a tapping gesture. They take a function through the onPress props which will be called when the touch begins and ends within the bounds of the component.

Example:

class MyButton extends Component { +Handling Touches – React Native | A framework for building native apps using React
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Handling Touches #

Edit on GitHub

Users interact with mobile apps mainly through touch. They can use a combination of gestures, such as tapping on a button, scrolling a list, or zooming on a map.

React Native provides components to handle common gestures, such as taps and swipes, as well as a comprehensive gesture responder system to allow for more advanced gesture recognition.

Tappable Components #

You can use "Touchable" components when you want to capture a tapping gesture. They take a function through the onPress props which will be called when the touch begins and ends within the bounds of the component.

Example:

class MyButton extends Component { _onPressButton() { console.log("You tapped the button!"); } @@ -26,6 +26,6 @@ apiKey: '2c98749b4a1e588efec53b2acec13025', indexName: 'react-native-versions', inputSelector: '#algolia-doc-search', - algoliaOptions: { facetFilters: [ "tags:0.29" ], hitsPerPage: 5 } + algoliaOptions: { facetFilters: [ "tags:0.30" ], hitsPerPage: 5 } }); \ No newline at end of file diff --git a/docs/height-and-width.html b/docs/height-and-width.html index a4c444e0ce4..a13730dca25 100644 --- a/docs/height-and-width.html +++ b/docs/height-and-width.html @@ -1,4 +1,4 @@ -Height and Width – React Native | A framework for building native apps using React
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Height and Width #

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A component's height and width determine its size on the screen.

Fixed Dimensions #

The simplest way to set the dimensions of a component is by adding a fixed width and height to style. All dimensions in React Native are unitless, and represent density-independent pixels.

import React, { Component } from 'react'; +Height and Width – React Native | A framework for building native apps using React
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Height and Width #

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A component's height and width determine its size on the screen.

Fixed Dimensions #

The simplest way to set the dimensions of a component is by adding a fixed width and height to style. All dimensions in React Native are unitless, and represent density-independent pixels.

import React, { Component } from 'react'; import { AppRegistry, View } from 'react-native'; class FixedDimensionsBasics extends Component { @@ -47,6 +47,6 @@ AppRegistry. apiKey: '2c98749b4a1e588efec53b2acec13025', indexName: 'react-native-versions', inputSelector: '#algolia-doc-search', - algoliaOptions: { facetFilters: [ "tags:0.29" ], hitsPerPage: 5 } + algoliaOptions: { facetFilters: [ "tags:0.30" ], hitsPerPage: 5 } }); \ No newline at end of file diff --git a/docs/image.html b/docs/image.html index 56ab97ee9f6..08806e0a873 100644 --- a/docs/image.html +++ b/docs/image.html @@ -1,4 +1,4 @@ -Image – React Native | A framework for building native apps using React
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Image #

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A React component for displaying different types of images, +Image – React Native | A framework for building native apps using React

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Image #

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A React component for displaying different types of images, including network images, static resources, temporary local images, and images from local disk, such as the camera roll.

This exmaples shows both fetching and displaying an image from local storage as well as on from network.

import React, { Component } from 'react'; @@ -47,15 +47,15 @@ class DisplayAnImageWithStyle extends AppRegistry.registerComponent( 'DisplayAnImageWithStyle', () => DisplayAnImageWithStyle -);

Props #

onLayout function #

Invoked on mount and layout changes with -{nativeEvent: {layout: {x, y, width, height}}}.

onLoad function #

Invoked when load completes successfully.

onLoadEnd function #

Invoked when load either succeeds or fails.

onLoadStart function #

Invoked on load start.

e.g., onLoadStart={(e) => this.setState({loading: true})}

resizeMode enum('cover', 'contain', 'stretch') #

Determines how to resize the image when the frame doesn't match the raw +);

Props #

onLayout PropTypes.func #

Invoked on mount and layout changes with +{nativeEvent: {layout: {x, y, width, height}}}.

onLoad PropTypes.func #

Invoked when load completes successfully.

onLoadEnd PropTypes.func #

Invoked when load either succeeds or fails.

onLoadStart PropTypes.func #

Invoked on load start.

e.g., onLoadStart={(e) => this.setState({loading: true})}

resizeMode PropTypes.oneOf(['cover', 'contain', 'stretch', 'repeat']) #

Determines how to resize the image when the frame doesn't match the raw image dimensions.

  • cover: Scale the image uniformly (maintain the image's aspect ratio) so that both dimensions (width and height) of the image will be equal to or larger than the corresponding dimension of the view (minus padding).

  • contain: Scale the image uniformly (maintain the image's aspect ratio) so that both dimensions (width and height) of the image will be equal to or less than the corresponding dimension of the view (minus padding).

  • stretch: Scale width and height independently, This may change the aspect ratio of the src.

  • repeat: Repeat the image to cover the frame of the view. The -image will keep it's size and aspect ratio. (iOS only)

source ImageSourcePropType #

The image source (either a remote URL or a local file resource).

style style #

Flexbox...
ShadowPropTypesIOS#style...
Transforms...
backfaceVisibility enum('visible', 'hidden')
backgroundColor color
borderBottomLeftRadius number
borderBottomRightRadius number
borderColor color
borderRadius number
borderTopLeftRadius number
borderTopRightRadius number
borderWidth number
opacity number
overflow enum('visible', 'hidden')
resizeMode Object.keys(ImageResizeMode)
tintColor color

Changes the color of all the non-transparent pixels to the tintColor.

androidoverlayColor string

When the image has rounded corners, specifying an overlayColor will +image will keep it's size and aspect ratio. (iOS only)

source ImageSourcePropType #

The image source (either a remote URL or a local file resource).

style style #

Flexbox...
ShadowPropTypesIOS#style...
Transforms...
backfaceVisibility ReactPropTypes.oneOf(['visible', 'hidden'])
backgroundColor color
borderBottomLeftRadius ReactPropTypes.number
borderBottomRightRadius ReactPropTypes.number
borderColor color
borderRadius ReactPropTypes.number
borderTopLeftRadius ReactPropTypes.number
borderTopRightRadius ReactPropTypes.number
borderWidth ReactPropTypes.number
opacity ReactPropTypes.number
overflow ReactPropTypes.oneOf(['visible', 'hidden'])
resizeMode ReactPropTypes.oneOf(Object.keys(ImageResizeMode))
tintColor color

Changes the color of all the non-transparent pixels to the tintColor.

androidoverlayColor ReactPropTypes.string

When the image has rounded corners, specifying an overlayColor will cause the remaining space in the corners to be filled with a solid color. This is useful in cases which are not supported by the Android implementation of rounded corners: @@ -65,17 +65,26 @@ background and setting the overlayColor to the same color as the background.

For details of how this works under the hood, see http://frescolib.org/docs/rounded-corners-and-circles.html

ImageResizeMode is an Enum for different image resizing modes, set via the resizeMode style property on Image components. The values are contain, cover, -stretch, center, repeat.

testID string #

A unique identifier for this element to be used in UI Automation -testing scripts.

iosaccessibilityLabel string #

The text that's read by the screen reader when the user interacts with -the image.

iosaccessible bool #

When true, indicates the image is an accessibility element.

iosblurRadius number #

blurRadius: the blur radius of the blur filter added to the image

ioscapInsets {top: number, left: number, bottom: number, right: number} #

When the image is resized, the corners of the size specified +stretch, center, repeat.

testID PropTypes.string #

A unique identifier for this element to be used in UI Automation +testing scripts.

iosaccessibilityLabel PropTypes.string #

The text that's read by the screen reader when the user interacts with +the image.

iosaccessible PropTypes.bool #

When true, indicates the image is an accessibility element.

iosblurRadius PropTypes.number #

blurRadius: the blur radius of the blur filter added to the image

ioscapInsets {top: number, left: number, bottom: number, right: number} #

When the image is resized, the corners of the size specified by capInsets will stay a fixed size, but the center content and borders of the image will be stretched. This is useful for creating resizable rounded buttons, shadows, and other resizable assets. More info in the -official Apple documentation.

iosdefaultSource {uri: string, width: number, height: number, scale: number}, number #

A static image to display while loading the image source.

iosdefaultSource PropTypes.oneOfType([ + // TODO: Tooling to support documenting these directly and having them display in the docs. + PropTypes.shape({ + uri: PropTypes.string, + width: PropTypes.number, + height: PropTypes.number, + scale: PropTypes.number, + }), + PropTypes.number, +]) #

A static image to display while loading the image source.

  • uri - a string representing the resource identifier for the image, which should be either a local file path or the name of a static image resource (which should be wrapped in the require('./path/to/image.png') function).
  • width, height - can be specified if known at build time, in which case these will be used to set the default <Image/> component dimensions.
  • scale - used to indicate the scale factor of the image. Defaults to 1.0 if -unspecified, meaning that one image pixel equates to one display point / DIP.
  • number - Opaque type returned by something like require('./image.jpg').

iosonError function #

Invoked on load error with {nativeEvent: {error}}.

iosonProgress function #

Invoked on download progress with {nativeEvent: {loaded, total}}.

Methods #

static getSize(uri, success, failure): #

Retrieve the width and height (in pixels) of an image prior to displaying it. +unspecified, meaning that one image pixel equates to one display point / DIP.

  • number - Opaque type returned by something like require('./image.jpg').

    • iosonError PropTypes.func #

    Invoked on load error with {nativeEvent: {error}}.

    iosonProgress PropTypes.func #

    Invoked on download progress with {nativeEvent: {loaded, total}}.

    Methods #

    static getSize(uri, success, failure): #

    Retrieve the width and height (in pixels) of an image prior to displaying it. This method can fail if the image cannot be found, or fails to download.

    In order to retrieve the image dimensions, the image may first need to be loaded or downloaded, after which it will be cached. This means that in principle you could use this method to preload images, however it is not @@ -84,7 +93,7 @@ does not fully load/download the image data. A proper, supported way to preload images will be provided as a separate API.

    Parameters:
    Name and TypeDescription
    uri

    string

    The location of the image.

    success

    function

    The function that will be called if the image was sucessfully found and width and height retrieved.

    failure

    function

    The function that will be called if there was an error, such as failing to to retrieve the image.

    static prefetch(url): #

    Prefetches a remote image for later use by downloading it to the disk -cache

    Parameters:
    Name and TypeDescription
    url

    string

    The remote location of the image.

    Examples #

    		Edit on GitHub
    'use strict'; +cache

    Parameters:
    Name and TypeDescription
    url

    string

    The remote location of the image.

    Examples #

    		Edit on GitHub
    'use strict'; var React = require('react'); var ReactNative = require('react-native'); @@ -569,6 +578,18 @@ exports.examples ={image} /> </View> + { Platform.OS === 'ios' ? + <View style={styles.leftMargin}> + <Text style={[styles.resizeModeText]}> + Repeat + </Text> + <Image + style={styles.resizeMode} + resizeMode={Image.resizeMode.repeat} + source={image} + /> + </View> + : null } { Platform.OS === 'android' ? <View style={styles.leftMargin}> <Text style={[styles.resizeModeText]}> @@ -718,6 +739,6 @@ exports.examples \ No newline at end of file diff --git a/docs/images.html b/docs/images.html index 92d7f695e7b..1ee3a4080d2 100644 --- a/docs/images.html +++ b/docs/images.html @@ -1,4 +1,4 @@ -Images – React Native | A framework for building native apps using React
    React Native0.29

    The Basics

    Guides

    Guides (iOS)

    Guides (Android)

    components

    apis

    Images #

    		Edit on GitHub

    Static Image Resources #

    As of 0.14 release, React Native provides a unified way of managing images in your iOS and Android apps. To add a static image to your app, place it somewhere in your source code tree and reference it like this:

    <Image source={require('./my-icon.png')} />

    The image name is resolved the same way JS modules are resolved. In the example above the packager will look for my-icon.png in the same folder as the component that requires it. Also if you have my-icon.ios.png and my-icon.android.png, the packager will pick the file depending on the platform you are running on.

    You can also use @2x, @3x, etc. suffix in the file name to provide images for different screen densities. For example, if you have the following file structure:

    . +Images – React Native | A framework for building native apps using React
    React Native0.30

    The Basics

    Guides

    Guides (iOS)

    Guides (Android)

    components

    apis

    Images #

    		Edit on GitHub

    Static Image Resources #

    As of 0.14 release, React Native provides a unified way of managing images in your iOS and Android apps. To add a static image to your app, place it somewhere in your source code tree and reference it like this:

    <Image source={require('./my-icon.png')} />

    The image name is resolved the same way JS modules are resolved. In the example above the packager will look for my-icon.png in the same folder as the component that requires it. Also if you have my-icon.ios.png and my-icon.android.png, the packager will pick the file depending on the platform you are running on.

    You can also use @2x, @3x, etc. suffix in the file name to provide images for different screen densities. For example, if you have the following file structure:

    . ├── button.js └── img ├── check@2x.png @@ -37,6 +37,6 @@ using local resources that are outside of Images.xcassets.

    < apiKey: '2c98749b4a1e588efec53b2acec13025', indexName: 'react-native-versions', inputSelector: '#algolia-doc-search', - algoliaOptions: { facetFilters: [ "tags:0.29" ], hitsPerPage: 5 } + algoliaOptions: { facetFilters: [ "tags:0.30" ], hitsPerPage: 5 } }); \ No newline at end of file diff --git a/docs/integration-with-existing-apps.html b/docs/integration-with-existing-apps.html index b67db4934d1..291d771faef 100644 --- a/docs/integration-with-existing-apps.html +++ b/docs/integration-with-existing-apps.html @@ -1,4 +1,4 @@ -Integration With Existing Apps – React Native | A framework for building native apps using React
    React Native0.29

    The Basics

    Guides

    Guides (iOS)

    Guides (Android)

    components

    apis

    Integration With Existing Apps #

    		Edit on GitHub
    +Integration With Existing Apps – React Native | A framework for building native apps using React
    React Native0.30

    The Basics

    Guides

    Guides (iOS)

    Guides (Android)

    components

    apis

    Integration With Existing Apps #

    		Edit on GitHub