Fabrizio BertoglioandFacebook GitHub Bot
35a1648d0c
Summary: Adding paragraphStyle.maximumLineHeight to a iOS UITextField displays the text under the UITextField ([ios-screenshot-1][1], [ios-screenshot-2][2], [ios-screenshot-3][3]). The issue reproduces on Storyboard App (iOS) using UITextField and paragraphStyle.maximumLineHeight. It is not caused by react-native. [1]: https://user-images.githubusercontent.com/24992535/238834159-566f7eef-ea2d-4fd4-a519-099b0a12046c.png "ios-screenshot-1" [2]: https://user-images.githubusercontent.com/24992535/238834184-feb454a9-6504-4832-aec8-989f1d027861.png "ios-screenshot-2" [3]: https://user-images.githubusercontent.com/24992535/238834283-cf572f94-a641-4790-92bf-bbe43afb1443.png "ios-screenshot-3" The issue is caused by a private class _UITextLayoutFragmentView (a CALayer children of UITextField), which assumes the wrong position when setting the lineHeight. _UITextLayoutFragmentView frame's y coordinates are set to 30, instead of 0 ([react-native-screenshot-1][4], [react-native-screenshot-2][5]) - The _UITextLayoutFragmentView layer does not correctly position - The issue is caused by adding paragraphStyle.maximumLineHeight to UITextField.attributedText - The parent UITextField bounds do not correctly position child _UITextLayoutFragmentView. The issue causes the below text Sdfsd to display under the TextInput. [4]: https://github.com/Expensify/App/assets/24992535/06726b45-7e35-4003-9fcc-50c8d0dff0f6 [5]: https://github.com/Expensify/App/assets/24992535/d9745d29-8863-4170-bcc3-e78fa7e550d2 I was able to fix the issue and correctly align the private layout view _UITextLayoutFragmentView using the public API RCTUITextField textRectForBound, which allows modifying the UITextField frame and inset. The solution consists in the following steps, applied only to UITextField with lineHeight prop: 1) set _UITextLayoutFragmentView to vertically align to the top. Required to correctly align _UITextLayoutFragmentView. 2) apply custom bounds with RCTUITextField textRectForBound to align _UITextLayoutFragmentView with the correct y coordinates and height 2) Adjust text baseline to be center aligned fixes https://github.com/facebook/react-native/issues/28012 ## Changelog: [IOS] [FIXED] - Fix TextInput vertical alignment issue when using lineHeight prop on iOS (Paper - old arch) Pull Request resolved: https://github.com/facebook/react-native/pull/37465 Test Plan: Extensive test included in the PR comments https://github.com/facebook/react-native/pull/37465#issuecomment-1551459879 Reviewed By: NickGerleman Differential Revision: D46086661 Pulled By: sammy-SC fbshipit-source-id: faece0940b153f3525ddcfae9417e943c957a5bf
React Native
Learn once, write anywhere:
Build mobile apps with React.
Getting Started · Learn the Basics · Showcase · Contribute · Community · Support
React Native brings React's declarative UI framework to iOS and Android. With React Native, you use native UI controls and have full access to the native platform.
- Declarative. React makes it painless to create interactive UIs. Declarative views make your code more predictable and easier to debug.
- Component-Based. Build encapsulated components that manage their state, then compose them to make complex UIs.
- Developer Velocity. See local changes in seconds. Changes to JavaScript code can be live reloaded without rebuilding the native app.
- Portability. Reuse code across iOS, Android, and other platforms.
React Native is developed and supported by many companies and individual core contributors. Find out more in our ecosystem overview.
Contents
- Requirements
- Building your first React Native app
- Documentation
- Upgrading
- How to Contribute
- Code of Conduct
- License
📋 Requirements
React Native apps may target iOS 13.4 and Android 5.0 (API 21) or newer. You may use Windows, macOS, or Linux as your development operating system, though building and running iOS apps is limited to macOS. Tools like Expo can be used to work around this.
🎉 Building your first React Native app
Follow the Getting Started guide. The recommended way to install React Native depends on your project. Here you can find short guides for the most common scenarios:
📖 Documentation
The full documentation for React Native can be found on our website.
The React Native documentation discusses components, APIs, and topics that are specific to React Native. For further documentation on the React API that is shared between React Native and React DOM, refer to the React documentation.
The source for the React Native documentation and website is hosted on a separate repo, @facebook/react-native-website.
🚀 Upgrading
Upgrading to new versions of React Native may give you access to more APIs, views, developer tools, and other goodies. See the Upgrading Guide for instructions.
React Native releases are discussed in this discussion repo.
👏 How to Contribute
The main purpose of this repository is to continue evolving React Native core. We want to make contributing to this project as easy and transparent as possible, and we are grateful to the community for contributing bug fixes and improvements. Read below to learn how you can take part in improving React Native.
Code of Conduct
Facebook has adopted a Code of Conduct that we expect project participants to adhere to. Please read the full text so that you can understand what actions will and will not be tolerated.
Contributing Guide
Read our Contributing Guide to learn about our development process, how to propose bugfixes and improvements, and how to build and test your changes to React Native.
Open Source Roadmap
You can learn more about our vision for React Native in the Roadmap.
Good First Issues
We have a list of good first issues that contain bugs which have a relatively limited scope. This is a great place to get started, gain experience, and get familiar with our contribution process.
Discussions
Larger discussions and proposals are discussed in @react-native-community/discussions-and-proposals.
📄 License
React Native is MIT licensed, as found in the LICENSE file.
React Native documentation is Creative Commons licensed, as found in the LICENSE-docs file.