·iOS系统中的音频播放方式·AVAudioPlayer、AVPlayer、系统声音、音频队列
·AVAudioPlayer·使用简单方便，但只能播放本地音频，不支持流媒体播放
·AVPlayer·iOS4.0以后，可以使用AVPlayer播放本地音频和支持流媒体播放，但提供接口较少，处理音频不够灵活·音频队列
·音频队列主要处理流媒体播放，提供了强大且灵活的API接口（C函数的接口），但处理起来也较为复杂
·播放系统声音·音频数据可分为压缩和非压缩的存储类型。压缩的音频文件虽然文件体积较小（相对于非压缩的），但需要耗费处理器的性能进行解压和解码。
·如果音频文件体积较小，压缩后的音频文件，也不会节省较大的磁盘空间。像这一类小型非压缩的文件可以注册成为系统声音·格式为：caf/wav/aiff格式，且时长小于30s
- (void)viewDidLoad {
[super viewDidLoad];
//1.plist文件Required background modes
//App plays audio or streams audio/video using AirPlay
//2.设置后台播放
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
//1取得本地音频文件路径
NSString*filePath = [[NSBundle mainBundle] pathForResource:@"安静" ofType:@"mp3"];
NSURL*url = [NSURLfileURLWithPath:filePath];
//创建全局播放器 AVAudioPlayer 只能播放本地音频文件
_audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
//2播放流媒体音乐，AVPlayer都支持
//获得网络链接
NSString *str = @"http://ra01.sycdn.kuwo.cn/resource/n3/32/56/3260586875.mp3";
NSURL*url1 = [NSURLURLWithString:str];
_player= [[AVPlayeralloc]initWithURL:url1];
}
//1播放本地音乐
- (IBAction)playLocalMusic:(id)sender {
if(_audioPlayer.isPlaying){
[_audioPlayerpause];
}else{
[_audioPlayerplay];
}
}
//2播放流媒体音乐
- (IBAction)playMusic:(id)sender {
if(_isPlay) {
[_playerpause];
}else{
[_playerplay];
}
_isPlay = !_isPlay;
}
//3播放系统声音
- (IBAction)playSystemSound:(id)sender {
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"44th Street Medium.caf" ofType:nil];
NSURL*url = [NSURLfileURLWithPath:filePath];
UInt32 systemSoundID =10;
//注册系统声音
AudioServicesCreateSystemSoundID((__bridge CFURLRef)(url), &systemSoundID);
//根据id播放系统声音
AudioServicesPlaySystemSound(systemSoundID);
//设置手机振动
AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
}
//设置锁屏时界面显示的播放信息
-(void)_initUI{
/* MPMediaItemPropertyAlbumTitle
// MPMediaItemPropertyAlbumTrackCount
// MPMediaItemPropertyAlbumTrackNumber
// MPMediaItemPropertyArtist
// MPMediaItemPropertyArtwork
// MPMediaItemPropertyComposer
// MPMediaItemPropertyDiscCount
// MPMediaItemPropertyDiscNumber
// MPMediaItemPropertyGenre
// MPMediaItemPropertyPersistentID
// MPMediaItemPropertyPlaybackDuration
// MPMediaItemPropertyTitle*/
MPMediaItemArtwork *artWork = [[MPMediaItemArtwork alloc ] initWithImage:[UIImage imageNamed:@"mp3.jpg"]];
NSDictionary *dic = @{
MPMediaItemPropertyAlbumTitle:@"兄弟你变了",
MPMediaItemPropertyArtist:@"庞龙",
MPMediaItemPropertyArtwork: artWork
};
[[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:dic];
}
-(BOOL )canBecomeFirstResponder{
return YES;
}
-(void)viewWillAppear:(BOOL)animated{
[superviewWillAppear:animated];
[self becomeFirstResponder];
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self_initUI];
}
-(void)viewWillDisappear:(BOOL)animated{
[superviewWillDisappear:animated];
[self resignFirstResponder];
[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
}
//设置远程监控
-(void)remoteControlReceivedWithEvent:(UIEvent *)event{
if (event.type == UIEventTypeRemoteControl) {
switch(event.subtype) {
case UIEventSubtypeRemoteControlPlay:
[_audioPlayerplay];
NSLog(@"播放");
break;
case UIEventSubtypeRemoteControlPause:
[_audioPlayerpause];
NSLog(@"暂停");
break;
case UIEventSubtypeRemoteControlNextTrack:
NSLog(@"下一首");
break;
case UIEventSubtypeRemoteControlPreviousTrack:
NSLog(@"上一首");
break;
default:
break;
}
}
}