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                ### 【問題】 使用IOS9之前的SDK,轉屏會有幾個函數會被響應。 1.轉屏前回調函數 - (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)durationNS_DEPRECATED_IOS(3_0,8_0,"Implement viewWillTransitionToSize:withTransitionCoordinator: instead")__TVOS_PROHIBITED; 2.轉屏后回調函數 - (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientationNS_DEPRECATED_IOS(2_0,8_0)__TVOS_PROHIBITED; 可是在IOS9的SDK中不能再使用了,那我們該如何處理呢? ### 【分析】 根據幫助文檔的信息,讓我們改用下面這個函數 - (void)viewWillTransitionToSize:([CGSize](https://developer.apple.com/library/ios/documentation/GraphicsImaging/Reference/CGGeometry/index.html#//apple_ref/doc/c_ref/CGSize))`size `???????withTransitionCoordinator:(id<[UIViewControllerTransitionCoordinator](https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIViewControllerTransitionCoordinator_Protocol/index.html#//apple_ref/occ/intf/UIViewControllerTransitionCoordinator)>)`coordinator;` 可是怎么區分轉屏前后呢? 我們看到第二個參數coordinator,它的類型是[UIViewControllerTransitionCoordinator](https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIViewControllerTransitionCoordinator_Protocol/index.html#//apple_ref/occ/intf/UIViewControllerTransitionCoordinator),它能響應VC轉換進度,并且提供了以下方法: - (BOOL)animateAlongsideTransition:(void (^)(id<[UIViewControllerTransitionCoordinatorContext](https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIViewControllerTransitionCoordinatorContext_Protocol/index.html#//apple_ref/occ/intf/UIViewControllerTransitionCoordinatorContext)> context))`animation `????????????????????????completion:(void (^)(id<[UIViewControllerTransitionCoordinatorContext](https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIViewControllerTransitionCoordinatorContext_Protocol/index.html#//apple_ref/occ/intf/UIViewControllerTransitionCoordinatorContext)> context))`completion;` ### 【解決方法】 ~~~ - (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id <UIViewControllerTransitionCoordinator>)coordinator { [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) { NSLog(@"轉屏前調入"); } completion:^(id<UIViewControllerTransitionCoordinatorContext> context) { NSLog(@"轉屏后調入"); }]; [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator]; } ~~~
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