react-native/ReactKit/Views/RCTViewControllerProtocol.h

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// Copyright 2004-present Facebook. All Rights Reserved.
/**
* A simple protocol that any React-managed ViewControllers should implement.
* We need all of our ViewControllers to cache layoutGuide changes so any View
* in our View hierarchy can access accurate layoutGuide info at any time.
*/
@protocol RCTViewControllerProtocol <NSObject>
@property (nonatomic, readonly, strong) id<UILayoutSupport> currentTopLayoutGuide;
@property (nonatomic, readonly, strong) id<UILayoutSupport> currentBottomLayoutGuide;
@end