[Initialization] Launch screen white flash
Problem
I just wondering if there is a good practice about LaunchScreen. The reason I'm asking this is, if one adds LaunchScreen, there is a white flash before react-native kicks in and load the app. Is there any way we can prevent this?
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1 Fix
Optimize Launch Screen to Eliminate White Flash
The white flash occurs because the default background color of the launch screen is set to white, and there is a delay in loading the React Native app. This results in a visible transition from the white launch screen to the app's initial screen, which can be jarring for users.
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- 1
Set Launch Screen Background Color
Change the background color of the launch screen to match the primary color of your app. This will minimize the visual impact of the transition.
yamlIn your Xcode project, navigate to LaunchScreen.storyboard and set the background color of the main view to your app's primary color. - 2
Add a Splash Screen Image
Consider adding a splash screen image that represents your app's branding. This will provide a smoother transition and reduce the perception of a flash.
xmlIn your Android project, place your splash image in the drawable folder and reference it in the styles.xml file. - 3
Preload Essential Assets
Preload essential assets (like fonts and images) during the launch phase to reduce the loading time of the app. Use the react-native-splash-screen library to manage the splash screen effectively.
javascriptimport SplashScreen from 'react-native-splash-screen'; componentDidMount() { SplashScreen.show(); // Load assets here SplashScreen.hide(); } - 4
Optimize App Performance
Review and optimize your app's startup performance by minimizing heavy computations and reducing the size of the initial JavaScript bundle.
javascriptUse dynamic imports for components that are not immediately needed on the initial load. - 5
Test on Multiple Devices
Test the changes on multiple devices and screen sizes to ensure that the launch experience is consistent and the white flash is eliminated.
Validation
To confirm the fix worked, launch the app on a physical device and observe the transition from the launch screen to the app's initial screen. There should be no noticeable white flash, and the transition should feel seamless.
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Environment
Submitted by
Alex Chen
2450 rep