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2.PNG
主要代码如下:
//后台播放音频设置,需要在Capabilities->Background Modes中勾选Audio,Airplay,and Picture in Picture
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setActive:YES error:nil];
[session setCategory:AVAudioSessionCategoryPlayback error:nil];
//开始接受远程控制
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
//结束远程控制,需要的时候关闭
// [[UIApplication sharedApplication] endReceivingRemoteControlEvents];
//处理后台传递给我们的信息，用于音乐，在AppDelegate.m中重写
- (void)remoteControlReceivedWithEvent:(UIEvent *)event{
//处理后台传递给我们的控制信息，用于音乐
if (event.type == UIEventTypeRemoteControl) {
NSLog(@"%ld",event.subtype);
[[NSNotificationCenter defaultCenter] postNotificationName:@"songControlNotification" object:self userInfo:@{@"subtype":@(event.subtype)}];
/*
subtype中的枚举便是点击这些控制键后传递给我们的消息，我们可以根据这些消息在app内做逻辑处理。枚举如下，其中只有100之后的在音频控制中对我们有效：
typedef NS_ENUM(NSInteger, UIEventSubtype) {
// available in iPhone OS 3.0
UIEventSubtypeNone = 0,
// for UIEventTypeMotion, available in iPhone OS 3.0
UIEventSubtypeMotionShake = 1,
//这之后的是我们需要关注的枚举信息
// for UIEventTypeRemoteControl, available in iOS 4.0
//点击播放按钮或者耳机线控中间那个按钮
UIEventSubtypeRemoteControlPlay = 100,
//点击暂停按钮
UIEventSubtypeRemoteControlPause = 101,
//点击停止按钮
UIEventSubtypeRemoteControlStop = 102,
//点击播放与暂停开关按钮(iphone抽屉中使用这个)
UIEventSubtypeRemoteControlTogglePlayPause = 103,
//点击下一曲按钮或者耳机中间按钮两下
UIEventSubtypeRemoteControlNextTrack = 104,
//点击上一曲按钮或者耳机中间按钮三下
UIEventSubtypeRemoteControlPreviousTrack = 105,
//快退开始 点击耳机中间按钮三下不放开
UIEventSubtypeRemoteControlBeginSeekingBackward = 106,
//快退结束 耳机快退控制松开后
UIEventSubtypeRemoteControlEndSeekingBackward = 107,
//开始快进 耳机中间按钮两下不放开
UIEventSubtypeRemoteControlBeginSeekingForward = 108,
//快进结束 耳机快进操作松开后
UIEventSubtypeRemoteControlEndSeekingForward = 109,
};
*/
}
}
//监听锁屏状态 lock=1则为锁屏状态
uint64_t locked;
__block int token = 0;
notify_register_dispatch("com.apple.springboard.lockstate",&token,dispatch_get_main_queue(),^(int t){
});
notify_get_state(token, &locked);
//监听屏幕点亮状态 screenLight=1则为变暗关闭状态
uint64_t screenLight;
__block int lightToken = 0;
notify_register_dispatch("com.apple.springboard.hasBlankedScreen",&lightToken,dispatch_get_main_queue(),^(int t){
});
notify_get_state(lightToken, &screenLight);
// NSLog(@"screenLight=%llu locked=%llu",screenLight,locked);
if (screenLight == 1|| locked == 0) {
return;
}
//锁屏信息
[self showLockScreenTotaltime:totalSeconds andCurrentTime:playSeconds];
//锁屏控制音乐播放事件的通知
- (void)addNotification{
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(songPlayControl:) name:@"songControlNotification" object:nil];
}
- (void)songPlayControl:(NSNotification *)noti{
NSNumber* subtype = noti.userInfo[@"subtype"];
int type = [subtype intValue];
switch (type) {
case UIEventSubtypeRemoteControlNextTrack:
[self nextSongBtnClick];
break;
case UIEventSubtypeRemoteControlPreviousTrack:
[self previousSongBtnClick];
break;
case UIEventSubtypeRemoteControlPause:
[self playBtnClick:_playBtn];
break;
case UIEventSubtypeRemoteControlPlay:
[self playBtnClick:_playBtn];
break;
default:
break;
}
}
#pragma mark --- 锁屏歌曲信息
- (void)showLockScreenTotaltime:(float)totalTime andCurrentTime:(float)currentTime{
NSMutableDictionary * songDict = [[NSMutableDictionary alloc] init];
SongModel * songModel = self.songArray[_playIndex];
//设置歌曲题目
[songDict setObject:songModel.songName forKey:MPMediaItemPropertyTitle];
//设置歌手名
[songDict setObject:songModel.singerName forKey:MPMediaItemPropertyArtist];
//设置专辑名
[songDict setObject:songModel.songName forKey:MPMediaItemPropertyAlbumTitle];
//设置歌曲时长
[songDict setObject:[NSNumber numberWithDouble:totalTime] forKey:MPMediaItemPropertyPlaybackDuration];
//设置已经播放时长
[songDict setObject:[NSNumber numberWithDouble:currentTime] forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];
if (!_lrcImageView) {
_lrcImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width - 100,self.view.frame.size.width - 100 + 50)];
}
[_lrcImageView addSubview:self.lockScreenTableView];
_lrcImageView.image = _songImage.image;
//获取添加了歌词数据的背景图
UIGraphicsBeginImageContextWithOptions(_lrcImageView.frame.size, NO, 0.0);
CGContextRef context = UIGraphicsGetCurrentContext();
[_lrcImageView.layer renderInContext:context];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//设置显示的图片
[songDict setObject:[[MPMediaItemArtwork alloc] initWithImage:img]
forKey:MPMediaItemPropertyArtwork];
//更新字典
[[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:songDict];
}
demo和最新相关知识可以去我的这篇文章里查看： iOS 音乐播放器之锁屏效果+歌词解析
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