Unable to lock orientation on iPad Air 2

问题:

The iOS application I am working on has a view that needs to be locked in landscape orientation. Up to this point, that was accomplished by using the shouldAutorotate and supportedInterfaceOrientations methods, but on an iPad Air 2 running iOS9 beta5, these methods never fire and the orientation is not locked.

I have tried on the following devices, methods fired on all except the Air2 (running debug with Xcode beta6): iPhone 6+, iPad Mini, iPad Air 2, iPad 2, iPad 3

The methods not firing are as follows:

- (BOOL)shouldAutorotate {
    return YES;
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
    return UIInterfaceOrientationMaskLandscape;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
    return UIInterfaceOrientationMaskLandscapeRight;
}

View controller is displayed via presentViewController

回答1:

Multitasking can be turned off by adding the UIRequiresFullScreen field to the application's info.plist with the boolean value YES, and this will allow the orientation delegate methods shouldAutorotate, preferredInterfaceOrientation, and supportedInterfaceOrientations to fire.

As far as locking orientation AND supporting multitasking, I have not found a way to do this.

回答2:

The 'Requires full screen' setting can be enabled from 'General' of the target settings.

With this enabled, the orientation code will now run. As mentioned by ackerman91, you can also set UIRequiresFullScreen boolean to YES in the application info.plist or in the target 'Info' tab.

回答3:

I am thinking this is collateral damage with the multi-tasking feature. You won't be able to assume anymore that you own the whole screen. There may be other methods to call to disallow the multi-tasking mode.