检测耳机按钮按

Question

我需要利用耳机按钮按下我的应用程序以外的多媒体。这是迄今为止我所拥有的功能，它不起作用。当我按下耳机按钮，我的应用程序没有响应，而不是音乐播放...

- (BOOL)canBecomeFirstResponder { 

return YES; 
} 

- (void)viewDidAppear:(BOOL)animated { 

[[UIApplication sharedApplication] beginReceivingRemoteControlEvents]; 
if ([self canBecomeFirstResponder]) { 
    [self becomeFirstResponder]; 
    NSLog(@"became first responder"); 
} 

} 

- (void)remoteControlReceivedWithEvent:(UIEvent *)theEvent 
{ 
if (theEvent.type == UIEventTypeRemoteControl) { 
    switch(theEvent.subtype) { 
     case UIEventSubtypeRemoteControlTogglePlayPause: 
      NSLog(@"Hello"); 

     case UIEventSubtypeRemoteControlPlay: 
      NSLog(@"Hello 2"); 
      break; 
     case UIEventSubtypeRemoteControlPause: 
      NSLog(@"Hello 3"); 
      break; 
     case UIEventSubtypeRemoteControlStop: 
      NSLog(@"Hello 4"); 
      break; 
     default: 
      return; 
    } 
} 
} 

Answer 1

@ user1724494代码您使用的应用程序在后台运行，只有当，因为事件是我们可以在一个远程事件作品只能在后台操作中处理。

请参考苹果文档http://developer.apple.com/library/ios/#documentation/EventHandling/Conceptual/EventHandlingiPhoneOS/Introduction/Introduction.html