1.在UIViewController裡加上:
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayback error:nil];
[session setActive:YES error:nil];
2.在 info.plist 中加上「required background modes」Key , Value 選 App plays audio
3.若想要在螢幕鎖定或是多工列(按兩下Home)控制聲音播放的話，加上
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
關閉加上
[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
[self resignFirstResponder];設定canBecaomFirstResponder為Yes
- (BOOL)canBecomeFirstResponder {
NSLog(@"canBecomeFirstResponder"); return YES;}
4. 加控制的事件偵測
-(void)remoteControlReceivedWithEvent:(UIEvent *)receivedEvent{
if (receivedEvent.type == UIEventTypeRemoteControl) {
switch (receivedEvent.subtype) {
case UIEventSubtypeRemoteControlTogglePlayPause: //開始or暫停
break;
case UIEventSubtypeRemoteControlPreviousTrack: //上一首
break;
case UIEventSubtypeRemoteControlNextTrack: //下一頁
break;
case UIEventSubtypeRemoteControlBeginSeekingBackward: //長按後退鍵
break;
case UIEventSubtypeRemoteControlEndSeekingBackward: //長按後退鍵結束
break;
//還有其他事件等你自已發掘
default:
break;
}
}
}
5.可以加上以下這段，改變播放器的曲目資訊與專輯圖片
使用前請先 import MediaPlayer/MediaPlayer.h
- (void)configNowPlayingInfoCenter {
Class playingInfoCenter = NSClassFromString(@"MPNowPlayingInfoCenter");
if (playingInfoCenter) {
MPNowPlayingInfoCenter *center = [MPNowPlayingInfoCenter defaultCenter];
// 當前播放歌曲的圖片 MPMediaItemArtwork *artwork = [[MPMediaItemArtwork alloc] initWithImage:[UIImage imageNamed:@"Album.png"]];
NSDictionary*songInfo = [NSDictionary dictionaryWithObjectsAndKeys:@"專輯名稱", MPMediaItemPropertyArtist, @"專輯標題", MPMediaItemPropertyTitle,
artwork, MPMediaItemPropertyArtwork,
@"專輯介紹", MPMediaItemPropertyAlbumTitle,
nil];
center.nowPlayingInfo = songInfo;
}
}
6.如果在Cocos2d裡想實現以上的功能，若有用到SimpleAudioEngine，請把以下程式碼插在步驟1.的程式碼之前，目的是讓SimpleAudioEngine暫停，不讓音效的資源佔住。
[SimpleAudioEngine end];
以上，就可以很輕鬆的把這個功能加到應用程式裡面了。
