iOS-UI不会随着设备旋转的改变而变化

Question

I am working on orientation and Movie Player. The functionality is as follows:

• If I turn on full screen mode of MPMoviePlayer then it should open in landscape mode only.

• If I rotate my device to landscape, then it will automatically starts full screen mode of MPMoviePlayer

• And again it should come back to portrait mode when I turn off
  fullscreen mode of MPMoviePlayer or rotate device to portrait mode.

Now Problem is that, it goes to full screen mode on device rotation to landscape mode

but at the time of come back, The UI is not transforming to portrait mode properly.

This Problem is only with iOS 8.1, 8.2. It is working fine in iOS 7.* and 8.3, 8.4.

Please look at attached screens:

Before Full screen:

After full screen:

Come back to portrait mode:

I have used this code to handle orientation:

allowRotation is Boolean property declared in AppDelegate.h file

//Adding observer for movie player orientation event In App Delegate

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayerWillEnterFullscreenNotification:) name:MPMoviePlayerWillEnterFullscreenNotification object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayerWillExitFullscreenNotification:) name:MPMoviePlayerWillExitFullscreenNotification object:nil];

// Observer methods

- (void) moviePlayerWillEnterFullscreenNotification:(NSNotification*)notification {

    allowRotation = YES;
}


- (void) moviePlayerWillExitFullscreenNotification:(NSNotification*)notification {

    allowRotation = NO;
}

-(NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window{

    if (([[self.window.rootViewController presentedViewController] isKindOfClass:[MPMoviePlayerViewController class]]  && ![[self.window.rootViewController presentedViewController] isBeingDismissed]) || allowRotation)
    {
        return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;
    }
    else{

        allowRotation= NO;
        return UIInterfaceOrientationMaskPortrait;
    }
    return UIInterfaceOrientationMaskPortrait;
}

Please help me to resolve this problem.

Answer 1

Do

In your UIViewController , implement

-(UIInterfaceOrientationMask)supportedInterfaceOrientations
{
    // Do the dynamic logic here
}

Don't

Do not ignore the window parameter passed in:

- (UIInterfaceOrientationMask)application:(UIApplication *)application
      supportedInterfaceOrientationsForWindow:(nullable UIWindow *)window

Your current code is actually not responding to the question: ForWindow.

---

The general practice is to return

1. all the possible orientations for a given window (you typically only have a single window per application) in supportedInterfaceOrientationsForWindow
2. a subset of that list, which can be dynamic, in the view controller supportedInterfaceOrientations .

Example

// App delegate
- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(nullable UIWindow *)window {
    return UIInterfaceOrientationMaskAllButUpsideDown;
}

// View controller
-(UIInterfaceOrientationMask)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskLandscape;
}