我想从视图控制器播放视频。当我呈现它时，它呈现为纵向方向，因此视图转动。它只发生在iPhone上，而不是iPad上。
有一个ViewController> MyItemsController> VideoController
当我关闭VideoController时，视频控制器的父控制器（MyItemsController）就像：
视图控制器的故事板是：
代码是：
-(void)playMoviesForItems:(NSArray *)shopItems{
VideoPlayerViewController* moviePlayer = [self.storyboard instantiateViewControllerWithIdentifier:@"videoPlayerController"];
moviePlayer.modalPresentationStyle = UIModalPresentationCurrentContext;
moviePlayer.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentViewController:moviePlayer animated:NO completion:nil];
}
我将代码移到app delegate中：
-(void)playMoviesForItems:(NSArray *)shopItems{
VideoPlayerViewController* mp = [[self getStoryboard] instantiateViewControllerWithIdentifier:@"videoPlayerController"];
[mp playMoviesForItems:shopItems];
[self pauseBackgroundMusic];
[self.window makeKeyAndVisible];
[self.window.rootViewController presentViewController:mp animated:YES completion:NULL];
}
这一次，一切似乎都没问题。电影正在播放，我可以听到声音，但看不到视频。为什么？
虽然接受的答案被拒绝投票，因为它没有回答问题，这里有一些适用于iOS9：
在呈现ViewController（模态）时调用的方法是preferredInterfaceOrientationForPresentation。此方法必须返回方向。
您应该检查演示者的方向并将其作为首选项返回：
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
UIInterfaceOrientation topOrientation = self.navigationController.visibleViewController.interfaceOrientation;
UIInterfaceOrientation presentingOrientation = self.presentingViewController.interfaceOrientation;
return presentingOrientation ? presentingOrientation : topOrientation ? topOrientation : UIInterfaceOrientationLandscapeLeft;
}
topOrientation包含可见视图控制器的方向，而presentingOrientation是被调用到presentViewController:animated...的方向。一般来说，我建议你创建一个“基础”UIViewController类，并继承它。这样，所有视图控制器都将受益于此代码。
几分钟前我遇到了同样的问题。
发生在我身上的是，我试图用另一个不在等级中的ViewController呈现新的ViewController，它只是将它的视图添加为层次结构中第三个subview的ViewController。为了解决这个问题，我刚刚做了这个最后的ViewController提出了新问题。
什么不该做的例子：
UIViewController *secondController = [UIViewController alloc] init];
[rootViewController presentViewController:secondController animated:NO completion:nil];
UIViewController *controllerOutsideHierarchy = [UIViewController alloc] init];
[secondController.view addSubview:controllerOutsideHierarchy.view];
[controllerOutsideHierarchy presentViewController:thirdController animated:NO completion:nil];
应该做什么的例子：
UIViewController *secondController = [UIViewController alloc] init];
[rootViewController presentViewController:secondController animated:NO completion:nil];
UIViewController *controllerOutsideHierarchy = [UIViewController alloc] init];
[secondController.view addSubview:controllerOutsideHierarchy.view];
[secondController presentViewController:thirdController animated:NO completion:nil];
希望这可以帮助！
确保在子视图控制器中添加这两个：
- (UIInterfaceOrientationMask) supportedInterfaceOrientations
{
return UIInterfaceOrientationMaskLandscape;
}
- (BOOL) shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
return UIInterfaceOrientationIsLandscape(toInterfaceOrientation);
}
你必须在你的self.window.rootViewController'类中添加以下方法：
-(BOOL)shouldAutorotate
{
return [[self.viewControllers lastObject] shouldAutorotate];
}
-(NSUInteger)supportedInterfaceOrientations
{
return [[self.viewControllers lastObject] supportedInterfaceOrientations];
}
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
return [[self.viewControllers lastObject] preferredInterfaceOrientationForPresentation];
}
@end
如果你的rootViewController是[UINavigationController类]，那么命令+ n添加一个UINavigationController类，就像我下面的代码一样
@implementation UINavigationController (Rotation_For_iOS6)
-(BOOL)shouldAutorotate
{
return [[self.viewControllers lastObject] shouldAutorotate];
}
-(NSUInteger)supportedInterfaceOrientations
{
return [[self.viewControllers lastObject] supportedInterfaceOrientations];
}
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
return [[self.viewControllers lastObject] preferredInterfaceOrientationForPresentation];
}
@end
然后，转到viewController.m，你想成为横向或纵向模式，也许因为你是你的VideoController !!!!!!添加方法如下：
#pragma mark
#pragma mark ----- Orientation Control For iOS 6/7 -----
-(NSUInteger)supportedInterfaceOrientations
{
return UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;
}
-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
return (toInterfaceOrientation == UIInterfaceOrientationLandscapeRight||toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft);
}
现在我设置我的vc支持横向模式，最后但并非最不重要，确保您的项目部署信息选择您想要的方向。
Swift 4.1版本
要防止自动旋转方向，您需要覆盖shouldAutorotate变量
override var shouldAutorotate: Bool {
return false
}
要在横向模式下显示视图控制器，您需要覆盖preferredInterfaceOrientationForPresentation变量
override var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation {
return .landscapeLeft// or .landscapeRight
}
您需要提供视图控制器才能使其工作（它对推送的视图控制器不起作用）
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationMaskLandscape);
}
-(BOOL)shouldAutorotate
{
return YES;
}
-(NSUInteger)supportedInterfaceOrientations
{
return (UIInterfaceOrientationMaskLandscape);
}
试试这个...