demo中提供CCLockView可以直接使用来实现锁屏播放

技术:MPNowPlayingInfoCenter

1:MPNowPlayingInfoCenter简介

MPNowPlayingInfoCenter provides an interface for setting the current now 
MPNowPlayingInfoCenter提供了一个用于设置当前值的借口
// playing information for the application. This information will be displayed 
显示播放程序的信息
// wherever now playing information typically appears, such as the lock screen
锁屏时正在播放的信息的位置
// and app switcher. The now playing info dictionary contains a group of 
可以获得APP正在播放的相关信息
// metadata properties for a now playing item. The list of property constants
正在播放的原数据属性列表
// is available in <MediaPlayer/MPMediaItem.h>. The properties which are 
这些属性是在<MediaPlayer/MPMediaItem.h>中可用

2:支持的属性

3:使用方法:

3.1:引用头文件

#import <MediaPlayer/MediaPlayer.h>
#import <MediaPlayer/MPNowPlayingInfoCenter.h>
#import <AVFoundation/AVFoundation.h>

3.2: 设置锁屏信息显示

- (void)setLockScreenDisplay
{
    NSMutableDictionary *info = [NSMutableDictionary dictionary];
    [info setObject:_roomName forKey:MPMediaItemPropertyTitle];//标题
//    [info setObject:@"作者" forKey:MPMediaItemPropertyArtist];//作者
//    [info setObject:@"专辑作者" forKey:MPMediaItemPropertyAlbumArtist];//专辑作者
    [info setObject:[[MPMediaItemArtwork alloc]initWithImage:[UIImage imageNamed:@"LockIcon"]] forKey:MPMediaItemPropertyArtwork];//显示的图片
    [info setObject:[NSNumber numberWithDouble:_duration] forKey:MPMediaItemPropertyPlaybackDuration];//总时长
    [info setObject:[NSNumber numberWithDouble:0] forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];//当前播放时间
    [info setObject:[NSNumber numberWithFloat:1.0] forKey:MPNowPlayingInfoPropertyPlaybackRate];//播放速率
    [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:info];
}

3.3:设置支持后台播放

- (void)playingBackground
{
    AVAudioSession *session = [AVAudioSession sharedInstance];
    [session setCategory:AVAudioSessionCategoryPlayback error:nil];
    [session setActive:YES error:nil];
}

注意 需要在视频处于播放状态后再设置完锁屏界面和支持后台播放,然后要变成第一响应者,所以调用顺序为

 [self setLockScreenDisplay];//设置锁屏界面视图
        [self playingBackground];//后台支持播放
        [self becomeFirstResponder];
        [[UIApplication sharedApplication]beginReceivingRemoteControlEvents];

3.4:更新当前播放进度

-(void)updateCurrentDurtion:(int)currentDurtion{
    NSMutableDictionary *info = [[[MPNowPlayingInfoCenter defaultCenter]nowPlayingInfo] mutableCopy];
    [info setObject:[NSNumber numberWithDouble:currentDurtion] forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];
    [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:info];
//    NSLog(@"当前播放进度:%lf", currentDurtion);
}

3.5:更新当前回放速率

-(void)updatePlayBackRate:(float)rate{
    NSMutableDictionary *info = [[[MPNowPlayingInfoCenter defaultCenter]nowPlayingInfo] mutableCopy];
    [info setObject:[NSNumber numberWithFloat:rate] forKey:MPNowPlayingInfoPropertyPlaybackRate];
    [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:info];
}

3.6:更新歌词信息

-(void)updateCurrentChat:(NSString *)str{
//    NSLog(@"currentChat:%@", str);
    NSMutableDictionary *info = [[[MPNowPlayingInfoCenter defaultCenter]nowPlayingInfo] mutableCopy];
    [info setObject:str forKey:MPMediaItemPropertyArtist];
    [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:info];
}

3.7:播放暂停方法

- (void)resumeAndPauseWhtherPause:(BOOL)pause
{
    
    NSMutableDictionary *info = [[[MPNowPlayingInfoCenter defaultCenter]nowPlayingInfo] mutableCopy];
    if (pause) {
        [info setObject:[NSNumber numberWithFloat:0.00001] forKey:MPNowPlayingInfoPropertyPlaybackRate];
    }else
    {
        [info setObject:[NSNumber numberWithFloat:1.0] forKey:MPNowPlayingInfoPropertyPlaybackRate];
    }
    [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:info];
}

3.9:锁屏控制

- (void)remoteControlReceivedWithEvent:(UIEvent *)event
{
    if (event.type == UIEventTypeRemoteControl) {
        
        switch (event.subtype) {
            case UIEventSubtypeRemoteControlPlay://播放
                NSLog(@"开始播放");
                break;
            case UIEventSubtypeRemoteControlPause://暂停
                NSLog(@"暂停播放");
                break;
            case UIEventSubtypeRemoteControlStop://停止
                break;
            case UIEventSubtypeRemoteControlTogglePlayPause://切换播放暂停（耳机线控）
                break;
            case UIEventSubtypeRemoteControlNextTrack://下一首
                NSLog(@"下一首");
                break;
            case UIEventSubtypeRemoteControlPreviousTrack://上一首
                NSLog(@"上一首");
                break;
            case UIEventSubtypeRemoteControlBeginSeekingBackward://开始快退
                NSLog(@"开始快退");

                break;
            case UIEventSubtypeRemoteControlEndSeekingBackward://结束快退
                NSLog(@"结束快退");

                break;
            case UIEventSubtypeRemoteControlBeginSeekingForward://开始快进
                NSLog(@"开始快进");
                break;
            case UIEventSubtypeRemoteControlEndSeekingForward://结束快进
                NSLog(@"结束快进");

                break;
            default:
                break;
        }
        
    }
}