iOS 8 - 在关闭全屏 AVPlayerViewController 时将方向更改回纵向

Question

我的应用程序是一个纵向应用程序，但我有一个 View Controller 正在使用 AVPlayerViewController 显示实时流。

为了允许该播放器的全屏 View 横向显示，我在 AppDelegate.swift 中编写了这个方法:

func application(application: UIApplication, supportedInterfaceOrientationsForWindow window: UIWindow?) -> Int {
    var orientation =  UIInterfaceOrientationMask.Portrait

    if let presentedController = window?.rootViewController?.presentedViewController? {

        if presentedController.isKindOfClass( NSClassFromString("AVFullScreenViewController").self ) {
            orientation = .AllButUpsideDown
        } else if let navController = presentedController as? UINavigationController {
            if navController.topViewController.isKindOfClass( NSClassFromString("AVFullScreenViewController").self ) {
               orientation = .AllButUpsideDown
            }
        }
    }

    return  Int(orientation.rawValue)
}

这就是我调用初始化 AVPlayer 的方式:

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "showLiveStream" {

        SVProgressHUD.show()
        var queue: dispatch_queue_t = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)

        dispatch_async(queue, {
            let streamURL = NSURL(string: liveStreamURL)
            let playerItem = AVPlayerItem(URL: streamURL)
            let player = AVPlayer(playerItem: playerItem)

            dispatch_async(dispatch_get_main_queue(), {
                SVProgressHUD.dismiss()
                var playerViewController = segue.destinationViewController as AVPlayerViewController
                playerViewController.player = player
            })
        })
    }
}

问题:当我打开播放器的全屏 View ，然后更改为横向 View ，然后单击“完成”关闭全屏 View 时，我的应用程序保持横向。但我希望它再次旋转为纵向。我该怎么做？

Answer 1

与其实现application(_:supportedInterfaceOrientationsForWindow:)，不如尝试在每个 View Controller 上实现supportedInterfaceOrientations()。例如:

override func supportedInterfaceOrientations() -> Int {
    return Int(UIInterfaceOrientationMask.Portrait.rawValue)
}

这将确保 View Controller 不能横向显示，因此当关闭视频播放器时，它会直接回到纵向窗口。

更新 Objective-C:

- (NSUInteger)supportedInterfaceOrientations { 
    return UIInterfaceOrientationMaskPortrait; 
}