ios - AirPlay 外部屏幕返回 (0, 0, 0, 0) 作为边界

Question

我现在正在使用 AirPlay 来显示 AVPlayerLayer。这是我的代码片段:

        let secondScreen = UIScreen.screens()[1]
        secondScreen.overscanCompensation = UIScreenOverscanCompensation(rawValue: 3)!
        let screenBounds = secondScreen.bounds

        self.secondWindow = nil // free window when switching between two AirPlay devices
        self.secondWindow = UIWindow.init(frame: screenBounds)
        self.secondWindow?.screen = secondScreen

        layer.removeFromSuperlayer()
        layer.frame = screenBounds
        layer.videoGravity = AVLayerVideoGravityResizeAspect
        self.externalAirPlayView = nil // free view when switching between two AirPlay devices
        self.externalAirPlayView = UIView(frame: screenBounds)
        self.externalAirPlayView!.layer.addSublayer(layer)
        self.secondWindow?.addSubview(self.externalAirPlayView!)
        self.secondWindow?.makeKeyAndVisible()

这段代码通常工作正常，但有时我得到 (0, 0, 0, 0) 作为外部屏幕的边界。我还在 UIScreenDidConnectNotification 中得到 (0, 0, 0, 0) 。在这两种情况下，AVPlayerLayer 不会显示在 AirPlay 设备上，因为窗口框架设置不正确。

请注意，如果我将 (0, 0, 0, 0) 作为边界，即使一次，我将永远不会再次获得正确的边界，直到我重新启动应用程序或重新初始化当前 View Controller 。重新启动 AirPlay 设备似乎没有帮助。

有没有办法获得外部屏幕的正确边界？

Answer 1

好吧，我终于解决了这个问题。您可以在可用模式属性中找到正确的屏幕尺寸。代码看起来像这样

for screenMode in secondScreen.availableModes {
    if screenMode.size.width != && screenMode.size.height != 0 {
        screenBounds.size = screenMode.size
        break
    }
}