IOS8. After clicking the UIViewController on the UINavigationController and rotating the device, the size is incorrect in the previous view controller

Question

I have a UINavigationController with a root UIViewController ("root").

The root view controller pushes another child element of the UIViewController . When the “child” of the UIViewController displayed on the screen, I rotate the device and expect the “root” knob to be changed accordingly, but this will not happen. After setting a breakpoint in the root view controller:

 -(void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator { [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator]; } 

I see that the size is wrong, and the root view controller is not properly configured to resize.

Has anyone experienced this behavior?

The code is the same:

 @interface ViewController () @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; } -(void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator { /// The size is wrong if this view controller is off screen [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } @end 

Below is the NSLog size print screen after rotating the device. This is from the simulator, but the behavior on the device is the same.

Answer 1

Same problem in my project. It seems that the UINavigationController and UITabBarController (maybe all viewController?) Give children the wrong size when called:

'[super viewWillTransitionToSize: size withTransitionCoordinator: coordinator];'

I fixed the problem by overriding 'viewWillTransitionToSize: withTransitionCoordinator:' in my subclass of the tabBarController controller and navigation bar (same code in both).

 - (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator { for (UIViewController* aViewController in self.viewControllers) { [aViewController viewWillTransitionToSize:size withTransitionCoordinator:coordinator]; } if ([self presentedViewController]) { [[self presentedViewController] viewWillTransitionToSize:size withTransitionCoordinator:coordinator]; } } 

I am not sure if this is the best way, if you find something better, please tell me.

Answer 2

It is possible that only the window rotates. If you print it like this, it is always correct as I tested.

 [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) { } completion:^(id<UIViewControllerTransitionCoordinatorContext> context) { UIWindow *screen = [[[UIApplication sharedApplication] delegate] window]; CGSize mainWindowSize = screen.bounds.size; NSLog(@"Main window size is %@",NSStringFromCGSize(mainWindowSize)); }];