React NativeAccessibility (iOS)
Accessibility on iOS encompasses many topics, but for many, accessibility is synonymous with VoiceOver, a technology available since iOS 3.0. It acts as a screen reader, allowing people with visual impairments to use their iOS devices. Click here to learn more.
Making Accessible Apps #
Coding Accessibly #
accessible #
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.
accessibilityLabel #
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:
Accessibility (iOS)
Accessibility on iOS encompasses many topics, but for many, accessibility is synonymous with VoiceOver, a technology available since iOS 3.0. It acts as a screen reader, allowing people with visual impairments to use their iOS devices. Click here to learn more.
Making Accessible Apps #
Coding Accessibly #
accessible #
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.
accessibilityLabel #
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:
ActionSheetIOS
Methods #
Edit on GitHubExamples #
ActionSheetIOS
Methods #
Edit on GitHubExamples #
ActivityIndicatorIOS
Edit on GitHubProps #
animating bool #
Whether to show the indicator (true, the default) or hide it (false).
color string #
The foreground color of the spinner (default is gray).
hidesWhenStopped bool #
Whether the indicator should hide when not animating (true by default).
onLayout function #
Invoked on mount and layout changes with
{nativeEvent: { layout: {x, y, width, height}}}.
size enum('small', 'large') #
Size of the indicator. Small has a height of 20, large has a height of 36.
Edit on GitHubExamples #
ActivityIndicatorIOS
Edit on GitHubProps #
animating bool #
Whether to show the indicator (true, the default) or hide it (false).
color string #
The foreground color of the spinner (default is gray).
hidesWhenStopped bool #
Whether the indicator should hide when not animating (true by default).
onLayout function #
Invoked on mount and layout changes with
{nativeEvent: { layout: {x, y, width, height}}}.
size enum('small', 'large') #
Size of the indicator. Small has a height of 20, large has a height of 36.
Edit on GitHubExamples #
AlertIOS
Launches an alert dialog with the specified title and message.
Optionally provide a list of buttons. Tapping any button will fire the +
AlertIOS
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
The last button in the list will be considered the 'Primary' button and it will appear bold.
Animations
Fluid, meaningful animations are essential to the mobile user experience. Like +
Animations
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
diff --git a/docs/appregistry.html b/docs/appregistry.html
index 98ad72cc46b..65423a410e5 100644
--- a/docs/appregistry.html
+++ b/docs/appregistry.html
@@ -1,4 +1,4 @@
-
AppRegistry
AppRegistry is the JS entry point to running all React Native apps. App
+
AppRegistry
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
diff --git a/docs/appstateios.html b/docs/appstateios.html
index 3c3c12b49d7..b8f46835c4f 100644
--- a/docs/appstateios.html
+++ b/docs/appstateios.html
@@ -1,4 +1,4 @@
-
AppStateIOS
AppStateIOS can tell you if the app is in the foreground or background,
+
AppStateIOS
AppStateIOS can tell you if the app is in the foreground or background,
and notify you when the state changes.
AppStateIOS is frequently used to determine the intent and proper behavior when handling push notifications.
iOS App States #
active- The app is running in the foregroundbackground- The app is running in the background. The user is either in another app or on the home screeninactive- This is a transition state that currently never happens for diff --git a/docs/asyncstorage.html b/docs/asyncstorage.html index 5ed234282e8..442d32aa5dc 100644 --- a/docs/asyncstorage.html +++ b/docs/asyncstorage.html @@ -1,4 +1,4 @@ -AsyncStorage – React Native | A framework for building native apps using React AsyncStorage
AsyncStorage is a simple, asynchronous, persistent, key-value storage +
AsyncStorage – React Native | A framework for building native apps using React AsyncStorage
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.
This JS code is a simple facade over the native iOS implementation to provide diff --git a/docs/cameraroll.html b/docs/cameraroll.html index eb1787a84a9..83e3396fdab 100644 --- a/docs/cameraroll.html +++ b/docs/cameraroll.html @@ -1,4 +1,4 @@ -
CameraRoll – React Native | A framework for building native apps using React CameraRoll
CameraRollprovides access to the local camera roll / gallery.Methods #
static saveImageWithTag(tag, successCallback, errorCallback) #
Saves the image to the camera roll / gallery.
@param {string} tag On Android, this is a local URI, such +
CameraRoll – React Native | A framework for building native apps using React CameraRoll
CameraRollprovides access to the local camera roll / gallery.Methods #
static saveImageWithTag(tag, successCallback, errorCallback) #
Saves the image to the camera roll / gallery.
@param {string} tag On Android, this is a local URI, such as
"file:///sdcard/img.png".On iOS, the tag can be one of the following:
- local URI
- assets-library tag
- a tag not maching any of the above, which means the image data will be stored in memory (and consume memory as long as the process is alive)
@param successCallback Invoked with the value of
tagon success. @param errorCallback Invoked with error message on error.static getPhotos(params, callback, errorCallback) #
Invokes
callbackwith photo identifier objects from the local camera diff --git a/docs/datepickerios.html b/docs/datepickerios.html index 63ac326e916..7c722004039 100644 --- a/docs/datepickerios.html +++ b/docs/datepickerios.html @@ -1,4 +1,4 @@ -DatePickerIOS – React Native | A framework for building native apps using React DatePickerIOS
Use
DatePickerIOSto render a date/time picker (selector) on iOS. This is +DatePickerIOS – React Native | A framework for building native apps using React DatePickerIOS
Use
DatePickerIOSto render a date/time picker (selector) on iOS. This is a controlled component, so you must hook in to theonDateChangecallback and update thedateprop in order for the component to update, otherwise the user's change will be reverted immediately to reflectprops.dateas the diff --git a/docs/debugging.html b/docs/debugging.html index a467e21b89c..41867232b29 100644 --- a/docs/debugging.html +++ b/docs/debugging.html @@ -1,4 +1,4 @@ -Debugging – React Native | A framework for building native apps using React Debugging
Debugging React Native Apps #
To access the in-app developer menu, shake the iOS device or press
control + ⌘ + zin the simulator.Hint
To disable the developer menu for production builds, open your project in Xcode and select
Product→Scheme→Edit Scheme...(or press⌘ + <). Next, selectRunfrom the menu on the left and change the Build Configuration toRelease.Reload #
Selecting
Reloador pressing⌘ + rin the simulator will reload the JavaScript that powers your application. If you have added new resources (such as an image toImages.xcassets) or modified any Objective-C/Swift code, you will need to re-build from Xcode for the changes to take effect (you can do this with⌘ + rin Xcode).Chrome Developer Tools #
To debug the JavaScript code in Chrome, select
Debug in Chromefrom the developer menu. This will open a new tab at http://localhost:8081/debugger-ui.Press
⌘ + option + ior selectView→Developer→Developer Toolsto toggle the developer tools console. Enable Pause On Caught Exceptions for a better debugging experience.To debug on a real device: Open the file
RCTWebSocketExecutor.mand changelocalhostto the IP address of your computer. Shake the device to open the development menu with the option to start debugging.React Developer Tools (optional) #
Install the React Developer Tools extension for Google Chrome. This will allow you to navigate the component hierarchy via the
Reactin the developer tools (see facebook/react-devtools for more information).Live Reload #
Select
Enable Live Reloadvia the developer menu to have the application automatically reload when changes are made to the JavaScript.FPS (Frames per Second) Monitor #
On
0.5.0-rcand higher versions, you can enable a FPS graph overlay in the developers menu in order to help you debug performance problems.Debugging
Debugging React Native Apps #
To access the in-app developer menu, shake the iOS device or press
control + ⌘ + zin the simulator.Hint
To disable the developer menu for production builds, open your project in Xcode and select
Product→Scheme→Edit Scheme...(or press⌘ + <). Next, selectRunfrom the menu on the left and change the Build Configuration toRelease.Reload #
Selecting
Reloador pressing⌘ + rin the simulator will reload the JavaScript that powers your application. If you have added new resources (such as an image toImages.xcassets) or modified any Objective-C/Swift code, you will need to re-build from Xcode for the changes to take effect (you can do this with⌘ + rin Xcode).Chrome Developer Tools #
To debug the JavaScript code in Chrome, select
Debug in Chromefrom the developer menu. This will open a new tab at http://localhost:8081/debugger-ui.Press
⌘ + option + ior selectView→Developer→Developer Toolsto toggle the developer tools console. Enable Pause On Caught Exceptions for a better debugging experience.To debug on a real device: Open the file
RCTWebSocketExecutor.mand changelocalhostto the IP address of your computer. Shake the device to open the development menu with the option to start debugging.React Developer Tools (optional) #
Install the React Developer Tools extension for Google Chrome. This will allow you to navigate the component hierarchy via the
Reactin the developer tools (see facebook/react-devtools for more information).Live Reload #
Select
Enable Live Reloadvia the developer menu to have the application automatically reload when changes are made to the JavaScript.FPS (Frames per Second) Monitor #
On
0.5.0-rcand higher versions, you can enable a FPS graph overlay in the developers menu in order to help you debug performance problems.Direct Manipulation
It is sometimes necessary to make changes directly to a component +
Direct Manipulation – React Native | A framework for building native apps using React Direct Manipulation
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 diff --git a/docs/embedded-app-ios.html b/docs/embedded-app-ios.html index 7fcd15b11e6..7d2b858973d 100644 --- a/docs/embedded-app-ios.html +++ b/docs/embedded-app-ios.html @@ -1,4 +1,4 @@ -
Integrating with Existing Apps (iOS) – React Native | A framework for building native apps using React Integrating with Existing Apps (iOS)
Since React makes no assumptions about the rest of your technology stack – it’s commonly noted as simply the
VinMVC– it’s easily embeddable within an existing non-React Native app. In fact, it integrates with other best practice community tools like CocoaPods.Requirements #
- CocoaPods –
gem install cocoapods - io.js
- Install nvm with its setup instructions here. Then run
nvm install iojs-v2 && nvm alias default iojs-v2, which installs the latest compatible version of io.js and sets up your terminal so that typingnoderuns io.js. With nvm you can install multiple versions of Node and io.js and easily switch between them.
- Install nvm with its setup instructions here. Then run
Install React Native Using CocoaPods #
CocoaPods is a package management tool for iOS/Mac development. We need to use it to download React Native. If you haven't installed CocoaPods yet, check out this tutorial.
When you are ready to work with CocoaPods, add the following line to
Podfile. If you don't have one, then create it under the root directory of your project.pod 'React' +Integrating with Existing Apps (iOS) – React Native | A framework for building native apps using React Integrating with Existing Apps (iOS)
Since React makes no assumptions about the rest of your technology stack – it’s commonly noted as simply the
VinMVC– it’s easily embeddable within an existing non-React Native app. In fact, it integrates with other best practice community tools like CocoaPods.Requirements #
- CocoaPods –
gem install cocoapods - io.js
- Install nvm with its setup instructions here. Then run
nvm install iojs-v2 && nvm alias default iojs-v2, which installs the latest compatible version of io.js and sets up your terminal so that typingnoderuns io.js. With nvm you can install multiple versions of Node and io.js and easily switch between them.
- Install nvm with its setup instructions here. Then run
Install React Native Using CocoaPods #
CocoaPods is a package management tool for iOS/Mac development. We need to use it to download React Native. If you haven't installed CocoaPods yet, check out this tutorial.
When you are ready to work with CocoaPods, add the following line to
Podfile. If you don't have one, then create it under the root directory of your project.pod 'React' pod 'React/RCTText' # Add any subspecs you want to use in your projectRemember to install all subspecs you need. The
<Text>element cannot be used withoutpod 'React/RCTText'.Then install your pods:
$ pod installCreate Your React Native App #
There are two pieces you’ll need to set up:
- The root JavaScript file that will contain your actual React Native app and other components
- Wrapper Objective-C code that will load up your script and create a
RCTRootViewto display and manage your React Native components
First, create a directory for your app’s React code and create a simple
index.ios.jsfile:$ mkdir ReactComponent $ touch ReactComponent/index.ios.jsCopy & paste following starter code for
index.ios.js– it’s a barebones React Native app:'use strict'; diff --git a/docs/flexbox.html b/docs/flexbox.html index 391fe319310..341a45d018c 100644 --- a/docs/flexbox.html +++ b/docs/flexbox.html @@ -1,4 +1,4 @@ -Flexbox – React Native | A framework for building native apps using React Flexbox
Edit on GitHubProps #
alignItems enum('flex-start', 'flex-end', 'center', 'stretch') #
alignSelf enum('auto', 'flex-start', 'flex-end', 'center', 'stretch') #
borderBottomWidth number #
borderLeftWidth number #
borderRightWidth number #
borderTopWidth number #
borderWidth number #
bottom number #
flex number #
flexDirection enum('row', 'column') #
flexWrap enum('wrap', 'nowrap') #
height number #
justifyContent enum('flex-start', 'flex-end', 'center', 'space-between', 'space-around') #
left number #
margin number #
marginBottom number #
marginHorizontal number #
marginLeft number #
marginRight number #
marginTop number #
marginVertical number #
padding number #
paddingBottom number #
paddingHorizontal number #
paddingLeft number #
paddingRight number #
paddingTop number #
paddingVertical number #
position enum('absolute', 'relative') #
right number #
top number #
width number #
Flexbox
Edit on GitHubProps #
alignItems enum('flex-start', 'flex-end', 'center', 'stretch') #
alignSelf enum('auto', 'flex-start', 'flex-end', 'center', 'stretch') #
borderBottomWidth number #
borderLeftWidth number #
borderRightWidth number #
borderTopWidth number #
borderWidth number #
bottom number #
flex number #
flexDirection enum('row', 'column') #
flexWrap enum('wrap', 'nowrap') #
height number #
justifyContent enum('flex-start', 'flex-end', 'center', 'space-between', 'space-around') #
left number #
margin number #
marginBottom number #
marginHorizontal number #
marginLeft number #
marginRight number #
marginTop number #
marginVertical number #
padding number #
paddingBottom number #
paddingHorizontal number #
paddingLeft number #
paddingRight number #
paddingTop number #
paddingVertical number #
position enum('absolute', 'relative') #
right number #
top number #
width number #
Geolocation
You need to include the
NSLocationWhenInUseUsageDescriptionkey +Geolocation – React Native | A framework for building native apps using React Geolocation
You need to include the
NSLocationWhenInUseUsageDescriptionkey in Info.plist to enable geolocation. Geolocation is enabled by default when you create a project withreact-native init.Geolocation follows the MDN specification: https://developer.mozilla.org/en-US/docs/Web/API/Geolocation
Methods #
static getCurrentPosition(geo_success: Function, geo_error?: Function, geo_options?: GeoOptions) #
Invokes the success callback once with the latest location info. Supported diff --git a/docs/gesture-responder-system.html b/docs/gesture-responder-system.html index ba230c96357..52026b3f263 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 Gesture Responder System
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
Touchableimplementation for things that should be "tappable". This uses the responder system and allows you to easily configure tap interactions declaratively. UseTouchableHighlightanywhere 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 happeningView.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 fingerView.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 releaseView.props.onResponderTerminate: (evt) => {}- The responder has been taken from the View. Might be taken by other views after a call toonResponderTerminationRequest, or might be taken by the OS without asking (happens with control center/ notification center on iOS)
evtis a synthetic touch event with the following form:nativeEventchangedTouches- Array of all touch events that have changed since the last eventidentifier- The ID of the touchlocationX- The X position of the touch, relative to the elementlocationY- The Y position of the touch, relative to the elementpageX- The X position of the touch, relative to the screenpageY- The Y position of the touch, relative to the screentarget- The node id of the element receiving the touch eventtimestamp- A time identifier for the touch, useful for velocity calculationtouches- Array of all current touches on the screen
Capture ShouldSet Handlers #
onStartShouldSetResponderandonMoveShouldSetResponderare 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*ShouldSetResponderhandlers. 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 aonStartShouldSetResponderCapturehandler which returns true.View.props.onStartShouldSetResponderCapture: (evt) => true,View.props.onMoveShouldSetResponderCapture: (evt) => true,
PanResponder #
For higher-level gesture interpretation, check out PanResponder.
Gesture Responder System
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
Touchableimplementation for things that should be "tappable". This uses the responder system and allows you to easily configure tap interactions declaratively. UseTouchableHighlightanywhere 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 happeningView.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 fingerView.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 releaseView.props.onResponderTerminate: (evt) => {}- The responder has been taken from the View. Might be taken by other views after a call toonResponderTerminationRequest, or might be taken by the OS without asking (happens with control center/ notification center on iOS)
evtis a synthetic touch event with the following form:nativeEventchangedTouches- Array of all touch events that have changed since the last eventidentifier- The ID of the touchlocationX- The X position of the touch, relative to the elementlocationY- The Y position of the touch, relative to the elementpageX- The X position of the touch, relative to the screenpageY- The Y position of the touch, relative to the screentarget- The node id of the element receiving the touch eventtimestamp- A time identifier for the touch, useful for velocity calculationtouches- Array of all current touches on the screen
Capture ShouldSet Handlers #
onStartShouldSetResponderandonMoveShouldSetResponderare 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*ShouldSetResponderhandlers. 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 aonStartShouldSetResponderCapturehandler which returns true.View.props.onStartShouldSetResponderCapture: (evt) => true,View.props.onMoveShouldSetResponderCapture: (evt) => true,
PanResponder #
For higher-level gesture interpretation, check out PanResponder.
Getting Started
Requirements #
- OS X - This repo only contains the iOS (7+) implementation right now, and Xcode only runs on Mac.
- Xcode 6.3 or higher is recommended.
- Homebrew is the recommended way to install io.js, watchman, and flow.
- Install io.js 1.0 or newer. io.js is the modern version of Node.
- Install nvm with its setup instructions here. Then run
nvm install iojs-v2 && nvm alias default iojs-v2, which installs the latest compatible version of io.js and sets up your terminal so that typingnoderuns io.js. With nvm you can install multiple versions of Node and io.js and easily switch between them. - New to npm?
- Install nvm with its setup instructions here. Then run
brew install watchman. We recommend installing watchman, otherwise you might hit a node file watching bug.brew install flow. If you want to use flow.
We recommend periodically running
brew update && brew upgradeto keep your programs up-to-date.Quick start #
npm install -g react-native-clireact-native init AwesomeProject
In the newly created folder
AwesomeProject/- Open
AwesomeProject.xcodeprojand hit run in Xcode. - Open
index.ios.jsin your text editor of choice and edit some lines. - Hit cmd+R in your iOS simulator to reload the app and see your change!
Congratulations! You've just successfully run and modified your first React Native app.
If you run into any issues getting started, see the troubleshooting page.
Getting Started
Requirements #
- OS X - This repo only contains the iOS (7+) implementation right now, and Xcode only runs on Mac.
- Xcode 6.3 or higher is recommended.
- Homebrew is the recommended way to install io.js, watchman, and flow.
- Install io.js 1.0 or newer. io.js is the modern version of Node.
- Install nvm with its setup instructions here. Then run
nvm install iojs-v2 && nvm alias default iojs-v2, which installs the latest compatible version of io.js and sets up your terminal so that typingnoderuns io.js. With nvm you can install multiple versions of Node and io.js and easily switch between them. - New to npm?
- Install nvm with its setup instructions here. Then run
brew install watchman. We recommend installing watchman, otherwise you might hit a node file watching bug.brew install flow. If you want to use flow.
We recommend periodically running
brew update && brew upgradeto keep your programs up-to-date.Quick start #
npm install -g react-native-clireact-native init AwesomeProject
In the newly created folder
AwesomeProject/- Open
AwesomeProject.xcodeprojand hit run in Xcode. - Open
index.ios.jsin your text editor of choice and edit some lines. - Hit cmd+R in your iOS simulator to reload the app and see your change!
Congratulations! You've just successfully run and modified your first React Native app.
If you run into any issues getting started, see the troubleshooting page.
Image
A React component for displaying different types of images, +
Image – React Native | A framework for building native apps using React Image
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.
Example usage:
renderImages: function() { return ( diff --git a/docs/interactionmanager.html b/docs/interactionmanager.html index 43c69898024..a6d705867c1 100644 --- a/docs/interactionmanager.html +++ b/docs/interactionmanager.html @@ -1,4 +1,4 @@ -InteractionManager – React Native | A framework for building native apps using React InteractionManager
InteractionManager allows long-running work to be scheduled after any +
InteractionManager – React Native | A framework for building native apps using React InteractionManager
InteractionManager allows long-running work to be scheduled after any interactions/animations have completed. In particular, this allows JavaScript animations to run smoothly.
Applications can schedule tasks to run after interactions with the following:
InteractionManager.runAfterInteractions(() => { // ...long-running synchronous task... diff --git a/docs/javascript-environment.html b/docs/javascript-environment.html index 41ff60f2b99..defc7947910 100644 --- a/docs/javascript-environment.html +++ b/docs/javascript-environment.html @@ -1,4 +1,4 @@ -JavaScript Environment – React Native | A framework for building native apps using React JavaScript Environment
JavaScript Runtime #
When using React Native, you're going to be running your JavaScript code in two environments:
- On iOS simulators and devices, Android emulators and devices React Native uses JavaScriptCore which is the JavaScript engine that powers Safari. On iOS JSC doesn't use JIT due to the absence of writable executable memory in iOS apps.
- When using Chrome debugging, it runs all the JavaScript code within Chrome itself and communicates with Objective-C via WebSocket. So you are using V8.
While both environments are very similar, you may end up hitting some inconsistencies. We're likely going to experiment with other JS engines in the future, so it's best to avoid relying on specifics of any runtime.
JavaScript Syntax Transformers #
Syntax transformers make writing code more enjoyable by allowing you to use new JavaScript syntax without having to wait for support on all interpreters.
As of version 0.5.0, React Native ships with the Babel JavaScript compiler. Check Babel documentation on its supported transformations for more details.
Here's a full list of React Native's enabled transformations.
ES5
- Reserved Words:
promise.catch(function() { });
ES6
- Arrow functions:
<C onPress={() => this.setState({pressed: true})} - Call spread:
Math.max(...array); - Classes:
class C extends React.Component { render() { return <View />; } } - Destructuring:
var {isActive, style} = this.props; - Computed Properties:
var key = 'abc'; var obj = {[key]: 10}; - Object Consise Method:
var obj = { method() { return 10; } }; - Object Short Notation:
var name = 'vjeux'; var obj = { name }; - Rest Params:
function(type, ...args) { } - Template Literals:
var who = 'world'; var str = `Hello ${who}`;
ES7
- Object Spread:
var extended = { ...obj, a: 10 }; - Function Trailing Comma:
function f(a, b, c,) { }
JavaScript Environment
JavaScript Runtime #
When using React Native, you're going to be running your JavaScript code in two environments:
- On iOS simulators and devices, Android emulators and devices React Native uses JavaScriptCore which is the JavaScript engine that powers Safari. On iOS JSC doesn't use JIT due to the absence of writable executable memory in iOS apps.
- When using Chrome debugging, it runs all the JavaScript code within Chrome itself and communicates with Objective-C via WebSocket. So you are using V8.
While both environments are very similar, you may end up hitting some inconsistencies. We're likely going to experiment with other JS engines in the future, so it's best to avoid relying on specifics of any runtime.
JavaScript Syntax Transformers #
Syntax transformers make writing code more enjoyable by allowing you to use new JavaScript syntax without having to wait for support on all interpreters.
As of version 0.5.0, React Native ships with the Babel JavaScript compiler. Check Babel documentation on its supported transformations for more details.
Here's a full list of React Native's enabled transformations.
ES5
- Reserved Words:
promise.catch(function() { });
ES6
- Arrow functions:
<C onPress={() => this.setState({pressed: true})} - Call spread:
Math.max(...array); - Classes:
class C extends React.Component { render() { return <View />; } } - Destructuring:
var {isActive, style} = this.props; - Computed Properties:
var key = 'abc'; var obj = {[key]: 10}; - Object Consise Method:
var obj = { method() { return 10; } }; - Object Short Notation:
var name = 'vjeux'; var obj = { name }; - Rest Params:
function(type, ...args) { } - Template Literals:
var who = 'world'; var str = `Hello ${who}`;
ES7
- Object Spread:
var extended = { ...obj, a: 10 }; - Function Trailing Comma:
function f(a, b, c,) { }
LayoutAnimation
Automatically animates views to their new positions when the +
LayoutAnimation – React Native | A framework for building native apps using React LayoutAnimation
Automatically animates views to their new positions when the next layout happens.
A common way to use this API is to call
LayoutAnimation.configureNextbefore callingsetState.Methods #
static configureNext(config: Config, onAnimationDidEnd?: Function) #
Schedules an animation to happen on the next layout.
@param config Specifies animation properties:
durationin millisecondscreate, config for animating in new views (seeAnimtype)update, config for animating views that have been updated (seeAnimtype)
@param onAnimationDidEnd Called when the animation finished. diff --git a/docs/linking-libraries-ios.html b/docs/linking-libraries-ios.html index c91c03899db..01fb8f271b1 100644 --- a/docs/linking-libraries-ios.html +++ b/docs/linking-libraries-ios.html @@ -1,4 +1,4 @@ -
Linking Libraries (iOS) – React Native | A framework for building native apps using React Linking Libraries (iOS)
Not every app uses all the native capabilities, and including the code to support +
Linking Libraries (iOS) – React Native | A framework for building native apps using React Linking Libraries (iOS)
Not every app uses all the native capabilities, and including the code to support all those features would impact the binary size... But we still want to make it easy to add these features whenever you need them.
With that in mind we exposed many of these features as independent static libraries.
For most of the libs it will be as simple as dragging two files, sometimes a third step will be necessary, but no more than that.
All the libraries we ship with React Native live on the
Librariesfolder in diff --git a/docs/linkingios.html b/docs/linkingios.html index 85ef7aeccd7..a8ac04e4c85 100644 --- a/docs/linkingios.html +++ b/docs/linkingios.html @@ -1,4 +1,4 @@ -LinkingIOS – React Native | A framework for building native apps using React LinkingIOS
LinkingIOSgives you a general interface to interact with both, incoming +LinkingIOS – React Native | A framework for building native apps using React LinkingIOS
LinkingIOSgives you a general interface to interact with both, incoming and outgoing app links.Basic Usage #
Handling deep links #
If your app was launched from a external url registered to your app you can access and handle it from any component you want with
componentDidMount() { var url = LinkingIOS.popInitialURL(); diff --git a/docs/listview.html b/docs/listview.html index 1564fe41993..934d874fede 100644 --- a/docs/listview.html +++ b/docs/listview.html @@ -1,4 +1,4 @@ -ListView – React Native | A framework for building native apps using React ListView
ListView - A core component designed for efficient display of vertically +
ListView – React Native | A framework for building native apps using React ListView
ListView - A core component designed for efficient display of vertically scrolling lists of changing data. The minimal API is to create a
ListView.DataSource, populate it with a simple array of data blobs, and instantiate aListViewcomponent with that data source and arenderRowdiff --git a/docs/mapview.html b/docs/mapview.html index 0f00d2abc17..77d89e73adb 100644 --- a/docs/mapview.html +++ b/docs/mapview.html @@ -1,4 +1,4 @@ -MapView – React Native | A framework for building native apps using React MapView
Edit on GitHubProps #
annotations [{latitude: number, longitude: number, animateDrop: bool, title: string, subtitle: string, hasLeftCallout: bool, hasRightCallout: bool, onLeftCalloutPress: function, onRightCalloutPress: function, id: string}] #
Map annotations with title/subtitle.
legalLabelInsets {top: number, left: number, bottom: number, right: number} #
Insets for the map's legal label, originally at bottom left of the map. +
MapView – React Native | A framework for building native apps using React MapView
Edit on GitHubProps #
annotations [{latitude: number, longitude: number, animateDrop: bool, title: string, subtitle: string, hasLeftCallout: bool, hasRightCallout: bool, onLeftCalloutPress: function, onRightCalloutPress: function, id: string}] #
Map annotations with title/subtitle.
legalLabelInsets {top: number, left: number, bottom: number, right: number} #
Insets for the map's legal label, originally at bottom left of the map. See
EdgeInsetsPropType.jsfor more information.mapType enum('standard', 'satellite', 'hybrid') #
The map type to be displayed.
- standard: standard road map (default)
- satellite: satellite view
- hybrid: satellite view with roads and points of interest overlayed
maxDelta number #
Maximum size of area that can be displayed.
minDelta number #
Minimum size of area that can be displayed.
onAnnotationPress function #
Callback that is called once, when the user is clicked on a annotation.
onRegionChange function #
Callback that is called continuously when the user is dragging the map.
onRegionChangeComplete function #
Callback that is called once, when the user is done moving the map.
pitchEnabled bool #
When this property is set to
trueand a valid camera is associated with the map, the camera’s pitch angle is used to tilt the plane of the map. When this property is set tofalse, the camera’s pitch diff --git a/docs/native-components-ios.html b/docs/native-components-ios.html index 03e25414b6b..03a6a224ebf 100644 --- a/docs/native-components-ios.html +++ b/docs/native-components-ios.html @@ -1,4 +1,4 @@ -Native UI Components (iOS) – React Native | A framework for building native apps using React Native UI Components (iOS)
There are tons of native UI widgets out there ready to be used in the latest apps - some of them are part of the platform, others are available as third-party libraries, and still more might be in use in your very own portfolio. React Native has several of the most critical platform components already wrapped, like
ScrollViewandTextInput, but not all of them, and certainly not ones you might have written yourself for a previous app. Fortunately, it's quite easy to wrap up these existing components for seamless integration with your React Native application.Like the native module guide, this too is a more advanced guide that assumes you are somewhat familiar with iOS programming. This guide will show you how to build a native UI component, walking you through the implementation of a subset of the existing
MapViewcomponent available in the core React Native library.iOS MapView example #
Let's say we want to add an interactive Map to our app - might as well use
MKMapView, we just need to make it usable from JavaScript.Native views are created and manipulated by subclasses of
RCTViewManager. These subclasses are similar in function to view controllers, but are essentially singletons - only one instance of each is created by the bridge. They vend native views to theRCTUIManager, which delegates back to them to set and update the properties of the views as necessary. TheRCTViewManagers are also typically the delegates for the views, sending events back to JavaScript via the bridge.Vending a view is simple:
- Create the basic subclass.
- Add the
RCT_EXPORT_MODULE()marker macro. - Implement the
-(UIView *)viewmethod
// RCTMapManager.m +Native UI Components (iOS) – React Native | A framework for building native apps using React Native UI Components (iOS)
There are tons of native UI widgets out there ready to be used in the latest apps - some of them are part of the platform, others are available as third-party libraries, and still more might be in use in your very own portfolio. React Native has several of the most critical platform components already wrapped, like
ScrollViewandTextInput, but not all of them, and certainly not ones you might have written yourself for a previous app. Fortunately, it's quite easy to wrap up these existing components for seamless integration with your React Native application.Like the native module guide, this too is a more advanced guide that assumes you are somewhat familiar with iOS programming. This guide will show you how to build a native UI component, walking you through the implementation of a subset of the existing
MapViewcomponent available in the core React Native library.iOS MapView example #
Let's say we want to add an interactive Map to our app - might as well use
MKMapView, we just need to make it usable from JavaScript.Native views are created and manipulated by subclasses of
RCTViewManager. These subclasses are similar in function to view controllers, but are essentially singletons - only one instance of each is created by the bridge. They vend native views to theRCTUIManager, which delegates back to them to set and update the properties of the views as necessary. TheRCTViewManagers are also typically the delegates for the views, sending events back to JavaScript via the bridge.Vending a view is simple:
- Create the basic subclass.
- Add the
RCT_EXPORT_MODULE()marker macro. - Implement the
-(UIView *)viewmethod
// RCTMapManager.m #import <MapKit/MapKit.h> #import "RCTViewManager.h" diff --git a/docs/native-modules-ios.html b/docs/native-modules-ios.html index 0fe63e11c8e..17eeaeecb45 100644 --- a/docs/native-modules-ios.html +++ b/docs/native-modules-ios.html @@ -1,4 +1,4 @@ -Native Modules (iOS) – React Native | A framework for building native apps using React Native Modules (iOS)
Sometimes an app needs access to platform API, and React Native doesn't have a corresponding module yet. Maybe you want to reuse some existing Objective-C, Swift or C++ code without having to reimplement it in JavaScript, or write some high performance, multi-threaded code such as for image processing, a database, or any number of advanced extensions.
We designed React Native such that it is possible for you to write real native code and have access to the full power of the platform. This is a more advanced feature and we don't expect it to be part of the usual development process, however it is essential that it exists. If React Native doesn't support a native feature that you need, you should be able to build it yourself.
This is a more advanced guide that shows how to build a native module. It assumes the reader knows Objective-C or Swift and core libraries (Foundation, UIKit).
iOS Calendar Module Example #
This guide will use the iOS Calendar API example. Let's say we would like to be able to access the iOS calendar from JavaScript.
A native module is just an Objective-C class that implements the
RCTBridgeModuleprotocol. If you are wondering, RCT is an abbreviation of ReaCT.// CalendarManager.h +Native Modules (iOS) – React Native | A framework for building native apps using React Native Modules (iOS)
Sometimes an app needs access to platform API, and React Native doesn't have a corresponding module yet. Maybe you want to reuse some existing Objective-C, Swift or C++ code without having to reimplement it in JavaScript, or write some high performance, multi-threaded code such as for image processing, a database, or any number of advanced extensions.
We designed React Native such that it is possible for you to write real native code and have access to the full power of the platform. This is a more advanced feature and we don't expect it to be part of the usual development process, however it is essential that it exists. If React Native doesn't support a native feature that you need, you should be able to build it yourself.
This is a more advanced guide that shows how to build a native module. It assumes the reader knows Objective-C or Swift and core libraries (Foundation, UIKit).
iOS Calendar Module Example #
This guide will use the iOS Calendar API example. Let's say we would like to be able to access the iOS calendar from JavaScript.
A native module is just an Objective-C class that implements the
RCTBridgeModuleprotocol. If you are wondering, RCT is an abbreviation of ReaCT.// CalendarManager.h #import "RCTBridgeModule.h" @interface CalendarManager : NSObject <RCTBridgeModule> diff --git a/docs/navigator-comparison.html b/docs/navigator-comparison.html index 21b5e542fd1..9e48af13ee5 100644 --- a/docs/navigator-comparison.html +++ b/docs/navigator-comparison.html @@ -1,4 +1,4 @@ -Navigator Comparison – React Native | A framework for building native apps using React Navigator Comparison
The differences between Navigator +
Navigator Comparison – React Native | A framework for building native apps using React Navigator Comparison
The differences between Navigator and NavigatorIOS are a common source of confusion for newcomers.
Both
NavigatorandNavigatorIOSare components that allow you to manage the navigation in your app between various "scenes" (another word diff --git a/docs/navigator.html b/docs/navigator.html index 5e5ff3c669b..17d0b35164d 100644 --- a/docs/navigator.html +++ b/docs/navigator.html @@ -1,4 +1,4 @@ -Navigator – React Native | A framework for building native apps using React