Question

我的应用只是肖像，但我想让用户在通过UIWebview观看全屏视频时旋转到横向。我做了一些研究，发现我应该将我的班级添加为这些通知的观察者：

UIMoviePlayerControllerDidEnterFullscreenNotification UIMoviePlayerControllerWillExitFullscreenNotification

我像这样的观察者添加和删除类：

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayerDidEnterFullScreen:) name:@"UIMoviePlayerControllerDidEnterFullscreenNotification" object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayerWillExitFullScreen:) name:@"UIMoviePlayerControllerWillExitFullscreenNotification" object:nil];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];

    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"UIMoviePlayerControllerDidEnterFullscreenNotification" object:nil];

    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"UIMoviePlayerControllerWillExitFullscreenNotification" object:nil];
}

- (void)moviePlayerDidEnterFullScreen:(NSNotification *)notification
{
    self.videoPlayingFullScreen = YES;
}

- (void)moviePlayerWillExitFullScreen:(NSNotification *)notification
{
    self.videoPlayingFullScreen = NO;
}

- (NSUInteger)supportedInterfaceOrientations
{
    if (self.videoPlayingFullScreen)
    {
        return UIInterfaceOrientationMaskAllButUpsideDown;
    }

    return UIInterfaceOrientationMaskPortrait;
}

我的问题是：我从未收到过“UIMoviePlayerControllerWillExitFullscreenNotification”。我无法使用UIMoviePlayerControllerDidExitFullscreenNotification，因为如果用户完成了横向观看全屏视频并按下“完成”，则前一个视图控制器也应以横向方式显示为横向。

还有另一种方法可以检测用户“确实”进入全屏并且“将”退出全屏吗？或者有什么我想念的东西？

修改我的应用仅适用于iOS 7.

Answer 1

您未获得UIMoviePlayerControllerWillExitFullscreenNotification回调的原因是因为您在viewWillDisappear:上以观察者身份移除了自己

Answer 2

由于这些回调没有记录，我使用Javascript事件（如H2CO3建议here）来确定视频何时开始，结束或暂停。

顺便说一下，我正在使用YouTube播放器。

首先，我设置UIWebview并将我的ViewController设置为委托。

接下来，我将HTML文件加载到UIWebview中。

<强>的index.html

<html>
    <body bgcolor=#8C1717 style="margin:0px;">
        <div id="ytplayer"></div>
        <script type="text/javascript">
            var tag = document.createElement('script');
            tag.src = "https://www.youtube.com/player_api";

            var firstScriptTag = document.getElementsByTagName('script')[0];
            firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

            var player;
            function onYouTubeIframeAPIReady()
            {
                player = new YT.Player('ytplayer',
                                       {
                                       height: 'videoHeight',
                                       width: 'videoWidth',
                                       videoId: 'videoID',
                                       playerVars: { 'showinfo':0, 'rel':0 },
                                       events: { 'onStateChange': onPlayerStateChange }
                                       });
            }

            function playerDidBeginPlaying()
            {
                document.location.href = "fake://video-began";
            }

            function playerDidEndPlaying()
            {
                document.location.href = "fake://video-ended";
            }

            var done = false;
            function onPlayerStateChange(event)
            {
                if (event.data == YT.PlayerState.PLAYING && !done)
                {
                    done = true;
                    playerDidBeginPlaying();
                }
                else if (event.data == YT.PlayerState.ENDED)
                {
                    playerDidEndPlaying();
                }
                else if (event.data == YT.PlayerState.PAUSED)
                {
                    playerDidEndPlaying();
                }
            }
        </script>
    </body>
</html>

在ViewController内部

    NSError *error = NULL;

    NSString *path = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html"];
    NSString *html = [[NSString alloc] initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:&error];

    if (error)
    {
#ifdef DEBUG
        NSLog(@"[YouTube Webview] Error: %@", [error description]);
#endif
    }

    [self.webView loadHTMLString:html baseURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] bundlePath]]];

然后，我实施了方法webView:shouldStartLoadWithRequest:navigationType:，以便在事件发生时得到通知。

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    if ([[[request URL] absoluteString] hasPrefix:@"fake://video-began"])
    {
        self.videoPlayingFullScreen = YES;

        return NO;
    }
    else if ([[[request URL] absoluteString] hasPrefix:@"fake://video-ended"])
    {
        self.videoPlayingFullScreen = NO;

        return NO;
    }

    return YES;
}

未收到UIMoviePlayerControllerWillExitFullscreenNotification

2 个答案: