我们如何在ios中处理前景中的耳机播放/暂停按钮事件

Question

我要求在前台处理耳机播放/暂停按钮事件.我怎么能使用下面的代码在后台处理相同的场景

if ([[UIApplication sharedApplication] respondsToSelector:@selector(beginReceivingRemoteControlEvents)]){
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:NULL];
    [self becomeFirstResponder];
    NSLog(@"Responds!");
}

如果可能,请帮助解释或示例代码.我做了很多研究但没有帮助.

Answer 1

还有另一种通过耳机实现播放器控制的方法.使用MPRemoteCommandCentertooglePlayPauseCommand. Apple文档

[[MPRemoteCommandCenter sharedCommandCenter].togglePlayPauseCommand addTarget:self action:@selector(onTooglePlayPause)];

Answer 2

您必须检查此标准:

1. 编辑info.plist以规定您在后台和前台执行音频(UIBackgroundModes).

2. 实现此功能:

   - (void)remoteControlReceivedWithEvent:(UIEvent *)theEvent 
   {
     if (theEvent.type == UIEventTypeRemoteControl)
     {
       switch(theEvent.subtype) {
       case UIEventSubtypeRemoteControlTogglePlayPause:
               //Insert code
               break;
           case UIEventSubtypeRemoteControlPlay:
               //Insert code
               break;
           case UIEventSubtypeRemoteControlPause:
               // Insert code
               break;
           case UIEventSubtypeRemoteControlStop:
               //Insert code.
               break;
           default:
               return;
       }
     }
   }
   

...显然,将"// insert code"替换为应用程序中相关的任何功能.

3>最后,为了调用上面的函数,将其插入到viewDidAppear事件中:

[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    if ([self canBecomeFirstResponder]) {
        [self becomeFirstResponder];
    }

另请看这个链接:http: //www.sagorin.org/2011/11/29/ios-playing-audio-in-background-audio/