我是 swift 和 Cocoa 的新手，具有 JavaFX 背景。我在 Xcode 6.1 中构建了我的第一个 Mac OS 应用程序，它使用了一个 AVPlayerView。我已将 AVPlayerView 配置为提供全屏按钮。播放视频时，按全屏图标会使播放器进入全屏。我正在寻找一种方法来使退出按钮使 AVPlayerView 返回非全屏。

到目前为止，这是我的代码:

//subclassed AVPlayerView in an attempt to capture keystrokes
class VideoPlayerView: AVPlayerView, NSWindowDelegate {

    var lastPlayValue = true   //used in toggling play on space
    var ifs = false;           //variable holding "is full screen"

    //overrode this to get keystrokes
    override var acceptsFirstResponder: Bool {
        return true
    }

    //thought this would be called when full screen is entered  
    //but it isn't
    func windowDidEnterFullScreen(notification: NSNotification) {
        ifs = true
        println("Entered full screen")
        //attempting to grab keyevents while in full screen
        becomeFirstResponder()
    }

    //thought this would be called when full screen has exited
    //but it isn't
    func windowDidExitFullScreen(notification: NSNotification) {
        ifs = false;
        //attempting to grab key events after full screen exited
        becomeFirstResponder()
        println("Exited Fullscreen")

    }


    //grabs key events.  Works when not in full screen mode
    override func keyUp(theEvent: NSEvent) {

       //handle events here.

    } 
}

我的问题是: 1) 当视频全屏显示时，VideoPlayerView 似乎失去了焦点。 2) 我无法检测到视频已全屏显示(windowDidEnter 方法未触发) 3) 我无法检测到视频已离开全屏(windowDidExit 方法未触发)

另外，由于我正在学习 Cocoa 和 Swift，请让我知道这种方法是否走在正确的轨道上。

感谢任何帮助或指点。

谢谢

新信息: 我已经注册了任何全屏 View 的通知，但从未收到过通知。在仔细检查 AVPlayerView 进入“全屏”后，它似乎模仿了全屏的特征，而不是真正的“全屏”。

最佳答案

我也遇到过 AVPlayerView 的这个问题。如果我像这样启用全屏按钮:

self.playerView.showsFullScreenToggleButton = YES;

然后我点击全屏按钮，视频进入全屏，但是，该应用程序不接受任何按键输入，您无法激活 Mission Montrol、LaunchPad 等。这是非常糟糕的用户体验，我相信如果您向 Mac App Store 提交这样的应用程序，它将被拒绝。我也试图让我的 AVPlayerView 成为第一响应者，但无济于事。

解决方案

因此，我研究了 QuickTime Player 如何在全屏显示视频方面发挥作用。我注意到它在播放器控件上没有全屏按钮。它处理全屏的方式是，当用户单击窗口的全屏控件时，它会重新调整窗口的大小，如果我是正确的 AVPlayerView 或 Apple 使用的任何内容。要实现与此类似的操作，请执行以下操作:

//The window that contains your AVPlayerView set the delegate
 [self.window setDelegate:self];


//So you can respond to these notifications

- (void)windowDidEnterFullScreen:(NSNotification *)notification{
        // wait a bit
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

                if (self.playerView.isReadyForDisplay == YES) {

        //Make sure the playerView is ready for display

        //Set the playerView to the screen's current frame (Very Important!)
         [self.playerView setFrame:[[NSScreen mainScreen] frame]];

        //Do other UI related things here e.g hide elements e.t.c

        }

        });
        }

- (void)windowWillExitFullScreen:(NSNotification *)notification{
//Do other UI related things here e.g show elements e.t.c

}

//If you have a ToolBar in your application do this:

- (NSApplicationPresentationOptions)window:(NSWindow *)window willUseFullScreenPresentationOptions:(NSApplicationPresentationOptions)proposedOptions
{
    return (NSApplicationPresentationFullScreen |
            NSApplicationPresentationHideDock |
            NSApplicationPresentationAutoHideMenuBar |
            NSApplicationPresentationAutoHideToolbar);
}

// To determine if the window is in fullscreen e.g. if the application opened/restored in a fullscreen state the windowDidEnterFullScreen will not be called. So you need to do this:

- (BOOL) isFullScreenMode {
    NSApplicationPresentationOptions opts = [[NSApplication sharedApplication ] presentationOptions];
    if ( opts & NSApplicationPresentationFullScreen) {
        return YES;
    }
    return NO;
}

结论

我希望这能回答您的问题。另外，我认为这是 Apple 方面的错误，所以我明天会提交错误报告。

关于macos - 需要 AVPlayerView 在按下 esc 按钮时退出全屏，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26557636/