presentViewController更改控制器的方向

Question

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＆gt; MyItemsController＆gt; 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：

-(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？

Answer 1

虽然接受的答案被拒绝投票，因为它没有回答这个问题，这里有一些适用于iOS9的内容：

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方式返回：

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
        UIInterfaceOrientation topOrientation = self.navigationController.visibleViewController.interfaceOrientation;
        UIInterfaceOrientation presentingOrientation = self.presentingViewController.interfaceOrientation;

        return   presentingOrientation ? presentingOrientation : topOrientation ? topOrientation : UIInterfaceOrientationLandscapeLeft;
}

topOrientation包含可见的视图控制器的方向，而presentingOrientation是被调用的方向presentViewController:animated... 一般来说，我建议你创建一个“基础”UIViewController类，并从中继承。这样，所有视图控制器都将受益于此代码。

Answer 2

几分钟前我遇到了同样的问题。

我发生的事情是，我试图将新的ViewController与另一个ViewController一起展示在层次结构中，它只是将其视图添加为层次结构中的subview个第三个ViewController。为了解决这个问题，我刚刚提出了这个新问题。{/ p>

不做的示例：

ViewController

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];

[controllerOutsideHierarchy presentViewController:thirdController animated:NO completion:nil];

希望这有帮助！

Answer 3

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);
}

Answer 4

您必须在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]，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 !!!!!! 添加以下方法：

#pragma mark
#pragma mark ----- Orientation Control For iOS 6/7 -----

-(NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;
}

-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    return (toInterfaceOrientation == UIInterfaceOrientationLandscapeRight||toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft);
}

现在我将我的vc设置为支持横向模式，最后但同样重要的是，确保您的项目部署信息选择您想要的方向。

Answer 5

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
}

要以横向模式显示视图控制器，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以使其正常运行（对于推送视图控制器不起作用）

Answer 6

 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationMaskLandscape);
}

-(BOOL)shouldAutorotate
{
    return YES;
}

-(NSUInteger)supportedInterfaceOrientations
{
    return (UIInterfaceOrientationMaskLandscape);
}

试试这个......