Question

我正在使用MPMoviePlayerController，我需要检测按下下一个/上一个按钮。我尝试了几件事，但似乎都没有。

以下是我的尝试：

远程控制事件

-(void) viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    [self becomeFirstResponder];
}  
-(void) viewWillDisappear:(BOOL)animated
{
    [[UIApplication sharedApplication] endReceivingRemoteControlEvents];
    [self resignFirstResponder];
    [super viewWillDisappear:animated];
}  
-(BOOL)canBecomeFirstResponder
{
    return YES;
}  
-(void)remoteControlReceivedWithEvent:(UIEvent *)receivedEvent
{
    // stuff
}

问题是永远不会调用remoteControlReceivedWithEvent方法。我已经读过，这在iOS版本高于6时无效 - 我正在使用iOS 7

通知

我尝试使用MPMoviePlayerPlaybackStateDidChangeNotification并检查MPMoviePlaybackStateSeekingForward或MPMoviePlaybackStateSeekingBackward - 不幸的是，这些播放状态是在拖动播放栏时设置的，而不是在按下下一个/上一个按钮时设置的。

有什么想法吗？

Answer 1

抱歉，我不太了解你的问题，但是如果你想在控制中心使用你的应用程序中的控件，你可以使用：

      // You need cath the singleton
MPRemoteCommandCenter *myRemote = [MPRemoteCommandCenter sharedCommandCenter];
//And add the selector you can fire depends on the button, a couple of examples:
[myRemote.playCommand addTarget:self action:@selector(myPlayMethods)];
[myRemote.nextTrackCommand addTarget:self action:@selector(myNextTrackMethods)];

Answer 2

尝试注册以下事件：

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

    // Turn on remote control event delivery
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

    // Set itself as the first responder
    [self becomeFirstResponder];
}

另请勿设置kAudioSessionProperty_OverrideCategoryMixWithOthers属性

Answer 3

您是否尝试过MPMoviePlayerNowPlayingMovieDidChangeNotification？如果这不起作用，那么我建议转移到较低级别的API，即AVPlayer。它可以在视频播放时以及其他方式对所有操作进行细粒度控制。

Answer 4

您需要注册才能处理moviePlayerLoadStateChanged的通知。当您按下next / prev按钮时，将调用moviePlayerLoadStateChanged并且loadState将为MPMovieLoadStateUnknown

-(void)registerMyStuff {
    [[NSNotificationCenter defaultCenter] addObserver:self
                            selector:@selector(moviePlayerLoadStateChanged:)
                                    name:MPMoviePlayerLoadStateDidChangeNotification
                                           object:self.mpc];
}

- (void)moviePlayerLoadStateChanged:(NSNotification *)notification
{
    MPMoviePlayerController *moviePlayer = notification.object;
    MPMovieLoadState loadState = moviePlayer.loadState;

    if(loadState == MPMovieLoadStateUnknown)
    {
        // this is where the next/prev buttons notify
        // there is no video in this state so load one
        // just reload the default movie

        NSLog(@"MPMovieLoadStateUnknown");
        self.mpc.contentURL = self.fileURL;
        [self.mpc prepareToPlay];

        return;
    }
    else if(loadState & MPMovieLoadStatePlayable)
    {
        NSLog(@"MPMovieLoadStatePlayable");
    }
    else if(loadState & MPMovieLoadStatePlaythroughOK)
    {
        NSLog(@"MPMovieLoadStatePlaythroughOK");
    } else if(loadState & MPMovieLoadStateStalled)
    {
        NSLog(@"MPMovieLoadStateStalled");
    }
}

Answer 5

您更改MPMoviePlayerController overlayView就像更改UIImagePickerController overlayView一样，以实现您需要的功能。

MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc]
    initWithContentURL:someUrl];

moviePlayer.movieControlMode = MPMovieControlModeHidden;
[moviePlayer play];

NSArray *windows = [[UIApplication sharedApplication] windows];

if ([windows count] > 1) {

     UIWindow *moviePlayerWindow = [[UIApplication sharedApplication] keyWindow];
     [moviePlayerWindow addSubview:yourCustomOverlayView];
}

MPMoviePlayerController - 检测按下Next / Prev按钮

5 个答案: