[英]Lock Screen iPod Controls Not Working With Spotify Music Player
我將Spotify播放器添加到了我的應用中,該播放器還使用MPMusicPlayerController播放音樂。 從Spotify播放音樂並且鎖定屏幕時,當用戶在鎖定的屏幕上按下這些按鈕時,不會收到播放/暫停和FFW / RWD的遠程控制事件。
如果正在從MPMusicPlayerController播放音樂,則可以基於以下代碼接收遠程控制事件:
-(void) ViewDidLoad {
...
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
...
}
和
- (BOOL) canBecomeFirstResponder
{
return YES;
}
- (void) remoteControlReceivedWithEvent: (UIEvent*) event
{
// see [event subtype] for details
if (event.type == UIEventTypeRemoteControl) {
// We may be receiving an event from the lockscreen
switch (event.subtype) {
case UIEventSubtypeRemoteControlTogglePlayPause:
case UIEventSubtypeRemoteControlPlay:
case UIEventSubtypeRemoteControlPause:
// User pressed play or pause from lockscreen
[self playOrPauseMusic:nil];
break;
case UIEventSubtypeRemoteControlNextTrack:
// User pressed FFW from lockscreen
[self fastForwardMusic:nil];
break;
case UIEventSubtypeRemoteControlPreviousTrack:
// User pressed rewind from lockscreen
[self rewindMusic:nil];
break;
default:
break;
}
}
}
當應用程序進入后台時,iPod控件是可見的,但是當我按下暫停鍵時,它們不會響應。 相反,當我按暫停鍵時,iPod控件消失了。 當流音頻(例如Spotify)從鎖定屏幕在后台播放時,需要什么附加功能才能檢測播放/暫停和FFW / RWD?
我相信我過去曾遇到過這種情況。 如果我沒記錯的話,我在
-(void)remoteControlReceivedWithEvent:(UIEvent *) event { ... }
以及
- (BOOL) canBecomeFirstResponder { return YES; }
到應用程序委托(這也是我的音頻控制器所在的位置)。 我遇到了一個問題,在我想捕獲UIEventTypeRemoteControl
通知的時間內,UIViewControllers還沒有UIEventTypeRemoteControl
。
試試看,看看是否有幫助。
經過進一步調查,我發現當我的應用程序進入后台並且接收到遙控器事件時,如果包含以下代碼,則iPod控件不會消失。
// Set up info center to display album artwork within ipod controls (needed for spotify)
MPMediaItemArtwork *ipodControlArtwork = [[MPMediaItemArtwork alloc]initWithImage:artworkImage];
[MPNowPlayingInfoCenter defaultCenter].nowPlayingInfo = [NSDictionary dictionaryWithObjectsAndKeys:nowPlayingTitle, MPMediaItemPropertyTitle,
nowPlayingArtist, MPMediaItemPropertyArtist, ipodControlArtwork, MPMediaItemPropertyArtwork, [NSNumber numberWithDouble:0.0], MPNowPlayingInfoPropertyPlaybackRate, nil];
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