iphone - 使用耳机检测用户输入

Question

我正在尝试检测连接到 iPhone 的耳机上的用户输入（点击）。到目前为止，我只发现了如何使用 AVAudioSession 检测中断。AVAudioSession 正确还是有其他方法？如何？

Answer 1

你要这个：

开始接收远程控制事件

你在你的一个 VC 类中实现了一些东西：

 // If using a nonmixable audio session category, as this app does, you must activate reception of 
//    remote-control events to allow reactivation of the audio session when running in the background.
//    Also, to receive remote-control events, the app must be eligible to become the first responder.
- (void) viewDidAppear: (BOOL) animated {

    [super viewDidAppear: animated];
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    [self becomeFirstResponder];
}

- (BOOL) canBecomeFirstResponder {

    return YES;
}


    // Respond to remote control events

- (void) remoteControlReceivedWithEvent: (UIEvent *) receivedEvent {

    if (receivedEvent.type == UIEventTypeRemoteControl) {

        switch (receivedEvent.subtype) {

            case UIEventSubtypeRemoteControlTogglePlayPause:
                [self playOrStop: nil];
                break;

            default:
                break;
        }
    }
}

请参阅此处的示例代码。

Answer 2

现在更容易了，从 iOS 7 开始。要在按下耳机播放/暂停按钮时执行一个块：

    MPRemoteCommandCenter *commandCenter = [MPRemoteCommandCenter sharedCommandCenter];

    [commandCenter.togglePlayPauseCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {
        NSLog(@"toggle button pressed");
        return MPRemoteCommandHandlerStatusSuccess;
    }];

或者，如果您更喜欢使用方法而不是块：

    [commandCenter.togglePlayPauseCommand addTarget:self action:@selector(toggleButtonAction)];

停止：

    [commandCenter.togglePlayPauseCommand removeTarget:self];

或者：

    [commandCenter.togglePlayPauseCommand removeTarget:self action:@selector(toggleButtonAction)];

您需要将其添加到文件的包含区域：

@import MediaPlayer;