无法将界面方向旋转为纵向倒置

Question

在iPhone模拟器和iPhone 3GS(iOS 6)上,我都无法将方向设置为纵向颠倒.我只有一个ViewController.我在其中添加了此代码:

-(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;
}

我还将此添加到AppDelegate.m:

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

我还检查了plist文件,两个方向都存在.在我的故事板上,在Simulated Metrics Orientation设置为Inferred.我在applicationDidFinishLaunchingWithOptions中什么都不做,除了返回YES.我刚刚在这个ViewController中添加了一个UIImageView.是否有可能使这个方向有效？

Answer 1

supportedInterfaceOrientations返回一个NSUInteger.它返回视图控制器支持的所有接口方向,即接口方向值的掩码.

您需要返回UIInterfaceOrientationMaskEnum中定义的值,如下所示:

- (BOOL)shouldAutorotate {
    return YES;
}

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