Implicit conversion from enumeration type ‘enum UIDeviceOrientation’
to different enumeration type ‘UIInterfaceOrientation’ (aka ‘enum
UIInterfaceOrientation’)

警告在viewController.m中

-(void)youTubeStarted:(NSNotification *)notification{
    // your code here
    NSLog(@"youTubeStarted");
    **[[UIApplication sharedApplication] setStatusBarOrientation:UIDeviceOrientationPortrait animated:NO];**
}

-(void)youTubeFinished:(NSNotification *)notification{
    // your code here
    NSLog(@"youTubeFinished");
}

- (void)youTubeVideoExit:(id)sender {
    **[[UIApplication sharedApplication] setStatusBarOrientation:UIDeviceOrientationPortrait animated:NO];**
}