January 2019
Intermediate to advanced
592 pages
14h 30m
English
Content preview from React Native Cookbook - Second Edition
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How it works...
In this recipe we've seen an example of having to use two separate approaches for accomplishing the same task. For iOS, we handled displaying the image mask exclusively in the native layer, without any need for the React Native layer. For Android, we used React Native to handle the image masking.
In step 3 we extended two Objective-C methods: applicationWillResignActive, which fires when an app changes from being foregrounded, and applicationDidBecomeActive, which fires when the app is foregrounded. For each event, we simply toggle an imageView that displays the hidden.jpg image store in the Images.xcassettes folder in the Xcode project.
In step 5 we used the React class RCTDeviceEventEmitter from the DeviceEventManagerModule ...
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