Cannot rotate interface orientation to portrait upside down

问题

Both on iPhone simulator and iPhone 3GS (iOS 6) I cannot manage to set the orientation to portrait upside down. I have just one ViewController. I've added this code in it:

-(BOOL) shouldAutorotate{
 return YES; 
}

-(UIInterfaceOrientation) preferredInterfaceOrientationForPresentation{
 return UIInterfaceOrientationPortraitUpsideDown;
}

- (NSUInteger)supportedInterfaceOrientations{
 return UIInterfaceOrientationPortrait | UIInterfaceOrientationPortraitUpsideDown;
}

-(BOOL) shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{
  if (toInterfaceOrientation==UIInterfaceOrientationPortrait || toInterfaceOrientation==UIInterfaceOrientationPortraitUpsideDown) {
    return YES;
  }
 return NO;
}

I also added this to AppDelegate.m:

-(NSUInteger) application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window{
    return UIInterfaceOrientationPortrait | UIInterfaceOrientationPortraitUpsideDown;
}

I've also checked the plist file, both orientations are present there. On my storyboard, at Simulated Metrics Orientation is set to Inferred. I do nothing in my applicationDidFinishLaunchingWithOptions, except return YES. I've just added a UIImageView inside of this ViewController. Is it possible to make this orientation work?

回答1:

supportedInterfaceOrientations returns an NSUInteger. It returns all of the interface orientations that the view controller supports, a mask of interface orientation values.

You need to return values defined in UIInterfaceOrientationMask Enum, like the following shows:

- (BOOL)shouldAutorotate {
    return YES;
}

- (NSUInteger)supportedInterfaceOrientations {
    return (UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskPortraitUpsideDown);
}

回答2:

I know there's an answer that worked but for anyone else who's still stuck with the same issue:

I had a similar problem that was connected to Xcode: portrait rotations weren't being supported despite returning YES to - (BOOL) shouldAutorotateToInterfaceOrientation: for all cases. It turned out to be the enabled 'Supported Interface Orientations' in the summary window of my target's project editor:

The above 'iPhone/iPad Depoloyment Info' selections weren't doing it, it was the 'iPad Deployment Info' section that appears to control what the simulator will do despite the fact that I was only using the iPhone sim. Once I'd enabled the same orientations in that section then the iPhone simulation worked and I was able to test what happened when the simulator was rotated....

回答3:

I tried many ways for this. It seems only one way it works, but globally through the app, not only for particular view controller.

First, you have to check on Upside Down of Device Orientation in target general settings.

Then, in navigation controller extension, you override the supportedInterfaceOrientations method

extension UINavigationController {
    override public func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
        return .All
    }
}

来源：https://stackoverflow.com/questions/14057778/cannot-rotate-interface-orientation-to-portrait-upside-down