仅使用纵向应用在景观上允许视频

I have a UIWebView included in a UIViewController which is a descendant of UINavigationController. It looks like this:

我有一个UIViewController中包含的UIWebView，它是UINavigationController的后代。它看起来像这样：

The app is portrait only. When I play the video I want the user to be able to rotate the device and see the video in landscape mode. I use this code to allow it:

该应用程序仅限肖像。当我播放视频时，我希望用户能够旋转设备并以横向模式观看视频。我使用这段代码来允许它：

- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
{
    id presentedViewController = [self topMostController];
    NSString *className = presentedViewController ? NSStringFromClass([presentedViewController class]) : nil;

    if ([className isEqualToString:@"MPInlineVideoFullscreenViewController"] ||
        [className isEqualToString:@"MPMoviePlayerViewController"] ||
        [className isEqualToString:@"AVFullScreenViewController"]) {
        return UIInterfaceOrientationMaskAllButUpsideDown;
    }

    return UIInterfaceOrientationMaskPortrait;
}

- (UIViewController *)topMostController {
    UIViewController *topController = [UIApplication sharedApplication].keyWindow.rootViewController;

    while (topController.presentedViewController) {
        topController = topController.presentedViewController;
    }

    return topController;
}

And then in my UINavigationController (so when the video finishes the view is not presented in landscape but only in portrait):

然后在我的UINavigationController中（所以当视频结束时，视图不是以横向呈现，而是仅以纵向呈现）：

- (BOOL)shouldAutorotate
{
    return NO;
}

- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return UIInterfaceOrientationPortrait;
}

Everything works perfectly:

一切都很完美：

But then the video is done playing (or the user taps ‘Done’) and the screens return to the underlying view, this is what happens:

但是视频完成播放（或者用户点击“完成”）并且屏幕返回基础视图，这就是发生的情况：

As you can see, the navigation bar slips under the status bar. Additionally, I get a lot of auto-layout errors in the logs: http://pastebin.com/09xHzmgJ

如您所见，导航栏在状态栏下滑动。另外，我在日志中遇到了很多自动布局错误：http：//pastebin.com/09xHzmgJ

Any idea about how to solve this?

有关如何解决这个问题的任何想法？

8 个解决方案

#1

I temporarily solved (through a hack) with the following code in the viewDidLoad of my controller. I have to specify that the code is specifically made for my case: since I explicitly disallow landscape orientation of my UINavigationController (see code above), the usual notification “UIDeviceOrientationDidChange” is not called when the playback finished and the window goes back to portrait. However, I hope there is a better option and this is a bug of the SDK, since it does not appear on iOS 7 and given the amount of auto-layout errors I get related to the video player (on which I have no control).

我在控制器的viewDidLoad中使用以下代码暂时解决（通过hack）。我必须指定代码专门针对我的情况：因为我明确禁止我的UINavigationController的横向方向（参见上面的代码），当回放结束并且窗口返回到肖像时，通常不会调用通知“UIDeviceOrientationDidChange”。但是，我希望有一个更好的选择，这是SDK的一个错误，因为它没有出现在iOS 7上，并且我得到了与视频播放器相关的自动布局错误（我无法控制） 。

- (void)viewDidLoad
{
    [super viewDidLoad];

    // […]

     /* 
     Hack to fix navigation bar position/height on iOS 8 after closing fullscreen video

     Observe for “UIWindowDidRotateNotification” since “UIDeviceOrientationDidChangeNotification” is not called in the present conditions
     Check if the notification key (“UIWindowOldOrientationUserInfoKey”) in userInfo is either 3 or 4, which means the old orientation was landscape
     If so, correct the frame of the navigation bar to the proper size.

     */
    [[NSNotificationCenter defaultCenter] addObserverForName:@"UIWindowDidRotateNotification" object:nil queue:nil usingBlock:^(NSNotification *note) {
        if ([note.userInfo[@"UIWindowOldOrientationUserInfoKey"] intValue] >= 3) {
            self.navigationController.navigationBar.frame = (CGRect){0, 0, self.view.frame.size.width, 64};
        }
    }];
}

And then…

接着…

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self forKeyPath:@"UIWindowDidRotateNotification"];
}

#2

I encountered exactly the same issue and used the same code as @entropid did. However the accepted solution did not work for me.

我遇到了完全相同的问题，并使用了与@entropid相同的代码。然而，接受的解决方案对我不起作用。

It took me hours to come up with the following one-line fix that made things working for me:

花了我几个小时来提出以下一线修复，使我的工作有用：

- (void)viewWillLayoutSubviews {
    [[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone];
}

#3

I faced this problem yesterday, where @entropid answer worked for iOS 9 and below, but for iOS 10 it didn't (since iOS 10 did actually hide the status bar, where on iOS 9 and below it was just the UINavigationBar that changed its frame without hiding the status bar and, thus, it overlapped that bar).

我昨天遇到了这个问题，其中@entropid的答案适用于iOS 9及以下，但对于iOS 10它没有（因为iOS 10确实隐藏了状态栏，在iOS 9及以下它只是改变了它的UINavigationBar帧没有隐藏状态栏，因此，它与该栏重叠）。

Also, subscribing to MPMoviePlayerControllerDidExitFullScreen notification didn't work either, sometimes it simply wasn't called (in my particular case, it was because it was a video from a UIWebView, which used a different class of player which looks similar to MPMoviePlayerController).

此外，订阅MPMoviePlayerControllerDidExitFullScreen通知也不起作用，有时它根本没有被调用（在我的特定情况下，这是因为它是来自UIWebView的视频，它使用了类似于MPMoviePlayerController的不同类别的播放器）。

So I solved it using a solution like the one @StanislavPankevich suggested, but I subscribed to notifications when a UIWindow has become hidden (which can be in several cases, like when a video has finished, but also when a UIActivityViewController dismisses and other cases) instead of viewWillLayoutSubviews. For my particular case (a subclass of UINavigationController), methods like viewDidAppear, viewWillAppear, etc. simply weren't being called.

所以我使用类似@StanislavPankevich建议的解决方案来解决它，但是当UIWindow被隐藏时我订阅了通知（在几种情况下，例如视频完成时，以及UIActivityViewController解散和其他情况时）而不是viewWillLayoutSubviews。对于我的特定情况（UINavigationController的子类），viewDidAppear，viewWillAppear等方法根本就没有被调用。

viewDidLoad

viewDidLoad中

- (void)viewDidLoad {
    [super viewDidLoad];

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(videoDidExitFullscreen:)
                                                 name:UIWindowDidBecomeHiddenNotification
                                               object:nil];

    // Some other logic...
}

dealloc

的dealloc

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

And finally, videoDidExitFullscreen

最后，videoDidExitFullscreen

- (void)videoDidExitFullscreen:(NSNotification *)notification {
    // You would want to check here if the window dismissed was actually a video one or not.

    [[UIApplication sharedApplication] setStatusBarHidden:NO
                                            withAnimation:UIStatusBarAnimationFade];

}

I used UIStatusBarAnimationFade because it looks a lot smoother than UIStatusBarAnimationNone, at least from a user perspective.

我使用了UIStatusBarAnimationFade，因为它看起来比UIStatusBarAnimationNone更平滑，至少从用户的角度来看。

#4

Swift version:

Swift版本：

//AppDelegate:
    func application(application: UIApplication, supportedInterfaceOrientationsForWindow window: UIWindow?) -> Int {

        var presentedVC = application.keyWindow?.rootViewController
        while let pVC = presentedVC?.presentedViewController
        {
            presentedVC = pVC
        }
        if let pVC = presentedVC
        {
            if contains(["MPInlineVideoFullscreenViewController", "MPMoviePlayerViewController", "AVFullScreenViewController"], pVC.nameOfClass)
            {
                return Int(UIInterfaceOrientationMask.AllButUpsideDown.rawValue)
            }
        }

        return Int(UIInterfaceOrientationMask.Portrait.rawValue)
    }

//Extension:
public extension NSObject{
    public class var nameOfClass: String{
        return NSStringFromClass(self).componentsSeparatedByString(".").last!
    }

    public var nameOfClass: String{
        return NSStringFromClass(self.dynamicType).componentsSeparatedByString(".").last!
    }
}

//View controller:
    override func supportedInterfaceOrientations() -> Int {
        return Int(UIInterfaceOrientationMask.Portrait.rawValue)
    }

    override func preferredInterfaceOrientationForPresentation() -> UIInterfaceOrientation {
        return UIInterfaceOrientation.Portrait
    }

    override func shouldAutorotate() -> Bool {
        return false
    }

    override func viewWillLayoutSubviews() {
        UIApplication.sharedApplication().setStatusBarHidden(false, withAnimation: UIStatusBarAnimation.None)
    }

#5

It's very simple, as it says @Stanislav Pankevich, but in

这很简单，正如@Stanislav Pankevich所说，但是在

swift 3 version

swift 3版

override func viewWillLayoutSubviews() {
    super.viewWillLayoutSubviews();
    UIApplication.shared.isStatusBarHidden = false
}

#6

I was having the same issue and using @entropid solution I was able to fix the navigation bar problem. But my view remains below the nav bar which I fix using "sizeToFit".

我遇到了同样的问题并使用@entropid解决方案我能够解决导航栏问题。但我的视图仍然在我使用“sizeToFit”修复的导航栏下方。

[[NSNotificationCenter defaultCenter] addObserverForName:@"UIWindowDidRotateNotification" object:nil queue:nil usingBlock:^(NSNotification *note) {
    if ([note.userInfo[@"UIWindowOldOrientationUserInfoKey"] intValue] >= 3) {
        [self.navigationController.navigationBar sizeToFit];
        self.navigationController.navigationBar.frame = (CGRect){0, 0, self.view.frame.size.width, 64};
    }
}];

I haven't tested it properly but its working for me right now

我没有正确测试它，但它现在正在为我工​​作

#7

On iOS 11 accepted solution didn't work for me. Seems that navigation bar stops reflecting for frame changes. But there is a workaround. At first, we need to modify supportedInterfaceOrientationsForWindow method to return UIInterfaceOrientationMaskLandscape for video controllers instead of UIInterfaceOrientationMaskAllButUpsideDown. In my case when I tap on embedded YouTube video, system always opens AVFullScreenViewController, so I removed other checks from original example. Code:

在iOS 11上，接受的解决方案对我不起作用。似乎导航栏停止反映帧更改。但有一个解决方法。首先，我们需要修改supportedInterfaceOrientationsForWindow方法，以返回视频控制器的UIInterfaceOrientationMaskLandscape，而不是UIInterfaceOrientationMaskAllButUpsideDown。在我的情况下，当我点击嵌入的YouTube视频时，系统总是打开AVFullScreenViewController，所以我从原始示例中删除了其他检查。码：

- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
    __kindof UIViewController *presentedViewController = [self topMostController];

    // Allow rotate videos
    NSString *className = presentedViewController ? NSStringFromClass([presentedViewController class]) : nil;
    if ([className isEqualToString:@"AVFullScreenViewController"]) {
        return UIInterfaceOrientationMaskLandscape;
    }

    return UIInterfaceOrientationMaskPortrait;
}

This didn't changes behaviour of AVFullScreenViewController on iOS 10 and less, but fixes navigation bar on iOS 11, so there is no need to update frame (also there is a side-effect on iOS 11 that video rotates from landscape when starts playing, but it's a tradeoff). Next, we need to add check in UIWindowDidBecomeHiddenNotification method:

这并没有改变iOS 10及更低版本的AVFullScreenViewController的行为，但修复了iOS 11上的导航栏，因此无需更新帧（iOS 11上也有一个副作用，视频在开始播放时从横向旋转，但这是一个权衡）。接下来，我们需要在UIWindowDidBecomeHiddenNotification方法中添加check：

- (void)videoDidExitFullscreen {
    if (@available(iOS 11, *)) {
        // Fixes status bar on iPhone X
        [self setNeedsStatusBarAppearanceUpdate];
    } else {
        self.navigationController.navigationBar.frame = CGRectMake(0, 0, self.view.bounds.size.width, statusAndNavBarHeight);
    }
}

Without setNeedsStatusBarAppearanceUpdate text in status bar will not appear on iPhone X, for other devices it's not needed.

如果没有setNeedsStatusBarAppearanceUpdate状态栏中的文本将不会出现在iPhone X上，对于其他设备则不需要。

#8

My answer on this question works great. Here It will play the video inside your WebView normally but if you tilt your phone it will play in Landscape!

我对这个问题的答案很有用。这里它会正常播放你的WebView中的视频，但如果你倾斜你的手机，它将在风景中播放！

Also important to note is if you include youtube.com as the Base URL it will load much quicker.

另外需要注意的是，如果您将youtube.com作为基本URL包含，它将加载得更快。

Make a UIWebView in your storyboard and connect the @property to it, then reference below.

在故事板中创建一个UIWebView并将@property连接到它，然后在下面引用。

    CGFloat width = self.webView.frame.size.height;
    CGFloat height = self.webView.frame.size.width;
    NSString *youTubeVideoCode = @"dQw4w9WgXcQ";
    NSString *embedHTML = @"<iframe width=\"%f\" height=\"%f\" src=\"http://www.youtube.com/embed/%@\" frameborder=\"0\" style=\"margin:-8px;padding:0;\" allowfullscreen></iframe>";
    NSString *html = [NSString stringWithFormat:embedHTML, width, height, youTubeVideoCode];
    self.webView.scrollView.bounces = NO;
    [self.webView loadHTMLString:html baseURL:[NSURL URLWithString:@"http://www.youtube.com"]];