iOS音頻控件不能與單身人士一起工作

我試圖用一個班級來管理全球AVAudioPlayer實例，但我無法讓鎖屏控制出現。該類的子類UIResponder，但無論我嘗試鎖定屏幕控件都不會出現。iOS音頻控件不能與單身人士一起工作

客戶端類使用- (void)setUrl:(NSURL *)url withTitle:(NSString *)title加載音頻和playAudio播放。我在這裏做錯了什麼？

我有後臺執行權限設置爲音頻&汽車玩，即使在模擬器>重置內容和設置後，這是失敗。

- (void)playAudio { 
    [self.audioPlayer play]; 
    [self updateNowPlayingInfo]; 
} 

- (void)stopAudio { 
    [self.audioPlayer stop]; 
    [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:nil]; 
} 

- (void)pauseAudio { 
    [self.audioPlayer pause]; 
    [self updateNowPlayingInfo]; 
} 

- (void)setupAudioSession { 
    AVAudioSession *audioSession = [AVAudioSession sharedInstance]; 
    NSError *setCategoryError = nil; 
    [audioSession setCategory:AVAudioSessionCategoryPlayback error:&setCategoryError]; 
    NSError *activationError = nil; 
    [audioSession setActive:YES error:&activationError]; 
} 

- (void)setupAudioControls { 
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents]; 
    [self becomeFirstResponder]; 
    [self updateNowPlayingInfo]; 
} 

- (BOOL)canBecomeFirstResponder { 
    return YES; 
} 

- (void)remoteControlReceivedWithEvent:(UIEvent *)receivedEvent { 
    if (receivedEvent.type == UIEventTypeRemoteControl) { 
     switch (receivedEvent.subtype) { 
      case UIEventSubtypeRemoteControlTogglePlayPause: 
       NSLog(@"Play pause"); 
       if (self.audioPlayer.isPlaying) { 
        [self.audioPlayer pause]; 
       } 
       else { 
        [self.audioPlayer play]; 
       } 
       break; 

      case UIEventSubtypeRemoteControlPreviousTrack: 
       break; 

      case UIEventSubtypeRemoteControlNextTrack: 
       break; 

      default: 
       break; 
     } 

     [self updateNowPlayingInfo]; 
    } 
} 

- (void)updateNowPlayingInfo { 
    NSMutableDictionary *albumInfo = [[NSMutableDictionary alloc] init]; 
    albumInfo[MPMediaItemPropertyTitle] = self.title; 
    albumInfo[MPMediaItemPropertyArtist] = @"Fidelity"; 
    albumInfo[MPMediaItemPropertyAlbumTitle] = self.title; 
    albumInfo[MPMediaItemPropertyPlaybackDuration] = @(self.audioPlayer.duration); 
    albumInfo[MPNowPlayingInfoPropertyElapsedPlaybackTime] = @(self.audioPlayer.currentTime); 
    [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:albumInfo]; 
} 

- (void)setUrl:(NSURL *)url withTitle:(NSString *)title { 
    self.title = title; 
    self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil]; 
    [self setupAudioSession]; 
    [self setupAudioControls]; 
}

來源

2015-02-11 Stefan Kendall

如果我不得不猜測，在'setupAudioControls'之後還有其他'becomeFirstResponder's。如果這個「UIResponder」不是應用程序發送到後臺時的第一響應者，我覺得這樣做不起作用。 – 2015-02-11 19:22:39

出於好奇，你認爲即使你不播放音頻，這個代碼也能工作嗎？我的理解是，截取遙控器事件只有在你開始播放音頻時纔有效，但我不清楚應該如何與鎖屏遙控器進行交互。 – Palpatim 2015-02-11 20:37:30

@Palpatim你可能是對的。我假設音樂還沒有開始，鎖屏播放按鈕可以啓動音樂。這可能是錯誤的。 – 2015-02-13 03:01:37

你-(void)setupAudioControls應該叫右後要去背景。在我的應用程序中：

... 
    [[NSNotificationCenter defaultCenter] addObserver:self 
              selector:@selector(appDidEnterBackground:) 
               name:UIApplicationDidEnterBackgroundNotification 
              object:nil]; 
... 

- (void)appDidEnterBackground:(NSNotification *)notification { 
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents]; 
    [self becomeFirstResponder]; 

    [self updateMediaInfo]; 
}

來源

2015-02-11 20:27:31 orkenstein

iOS音頻控件不能與單身人士一起工作

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