Accessing the In-App Developer MenuYou can also use the D keyboard shortcut when your app is running in the iOS Simulator, or M when running in an Android emulator. To enable them, open the Hardware menu, select Keyboard, and make sure that "Connect Hardware Keyboard" is checked. The adb shell command has many useful features many of which are described here:React Native supports a few keyboard shortcuts in the iOS Simulator. This command tells the Android device to type the character 'R' twice which is the React Native command to Reload on Android. Adb shell input text 'RR'. Using the cmd line you can send a command to the Android device.Will try on an upgraded project.I recently needed to get a new React Native + Expo project up and running on my Windows machine and found that the documentation was a little scattered, especially in terms of setting up Watchman and Android Studio to run an Android emulator. Alternatively for Android, you can run the command adb shell input keyevent 82 to open the dev menu (82 being the Menu key code).After I start the packager, by issuing react-native start, for the second time after creating a new RN 0.25.1 project, all reload features (Reload JS, Hot Reloading, Live Reload) seems to work well. You can also use the ⌘D keyboard shortcut when your app is running in the iOS Simulator, or ⌘M when running in an Android emulator on Mac OS and Ctrl+M on Windows and Linux. You can use React Native today in your existing Android and iOS projects or you can create a whole new app from scratch.You can access the developer menu by shaking your device or by selecting "Shake Gesture" inside the Hardware menu in the iOS Simulator. React Native combines the best parts of native development with React, a best-in-class JavaScript library for building user interfaces.ErrorsIn-app errors are displayed in a full screen alert with a red background inside your app. You have modified native code (Objective-C/Swift on iOS or Java/C++ on Android).Errors and warnings are displayed inside your app in development builds. 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. 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: This will allow you to persist the app's state through reloads.There are some instances where hot reloading cannot be implemented perfectly.
IgnoreWarnings ( ) In CI/Xcode, YellowBoxes can also be disabled by setting the IS_TESTING environment variable.RedBoxes and YellowBoxes are automatically disabled in release (production) builds. Specific warnings can be ignored programmatically by setting an array of prefixes that should be ignored: import from 'react-native' YellowBox. 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. These alerts are known as YellowBoxes. WarningsWarnings will be displayed on screen with a yellow background. You can use console.error() to manually trigger one. Adobe acrobat os x edit titleYou 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. Debugging using a custom JavaScript debuggerTo 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. Read this section to learn how. You may also want to enable Pause On Caught Exceptions for a better debugging experience.Note: the React Developer Tools Chrome extension does not work with React Native, but you can use its standalone version instead. You may also access the DevTools using keyboard shortcuts ( ⌘⌥I on macOS, Ctrl Shift I on Windows). This will open a new tab at Select Tools → Developer Tools from the Chrome Menu to open the Developer Tools. ![]() Android Emulator React Native On Hot Reload Simulator Within AIntegration with React Native InspectorOpen the in-app developer menu and choose "Toggle Inspector". Add the react-devtools package to your project using npm install -save-dev react-devtools, then add "react-devtools": "react-devtools" to the scripts section in your package.json, and then run npm run react-devtools from your project folder to open the DevTools. To use it, install the react-devtools package globally: npm install -g react-devtoolsNow run react-devtools from the terminal to launch the standalone DevTools app: react-devtoolsIt should connect to your simulator within a few seconds.Note: if you prefer to avoid global installations, you can add react-devtools as a project dependency. As soon as you select it, it will be available as $r in the Chrome console, letting you inspect its props, state, and instance properties.You can enable a performance overlay to help you debug performance problems by selecting "Perf Monitor" in the Developer Menu.The following section only applies to projects with native code exposed. There is a search box at the top that helps you find one by name. This step is essential.Then select a React component in React DevTools. Inspecting Component InstancesWhen debugging JavaScript in Chrome, you can inspect the props and state of the React components in the browser console.First, follow the instructions for debugging in Chrome to open the Chrome console.Make sure that the dropdown in the top left corner of the Chrome console says debuggerWorker.js. In this mode, clicking on something in the simulator will bring up the relevant components in the DevTools:You can choose "Toggle Inspector" in the same menu to exit this mode. Nes emulator roms for macDebugging native codeWhen working with native code, such as when writing native modules, you can launch the app from Android Studio or Xcode and take advantage of the native debugging features (setting up breakpoints, etc.) as you would in case of building a standard native app. Try disabling all of your extensions and re-enabling them one-by-one until you find the problematic extension. Debugging on a device with Chrome Developer ToolsIf you're using Create React Native App or Expo CLI, this is configured for you already.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: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. 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.If you're using Create React Native App or Expo CLI, console logs already appear in the same terminal output as the bundler.
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