iOS开发-音乐播放(AVAudioPlayer)
现在的手机的基本上没有人不停音乐的，我们无法想象在一个没有声音的世界里我们会过的怎么样，国内现在的主流的主流网易云音乐，QQ音乐，酷狗，虾米，天天基本上霸占了所有的用户群体，不过并没有妨碍大家对音乐的追求，乐流算是突围成功了，据说卖给QQ啦，有兴趣的可以看下。我们做不了那么高大上的就先做个简单的，最核心的就是播放，暂停，切歌，其他的基本上围绕这个修修补补锦上添花的，比如说歌曲名称，专辑，谁听了这首歌。。。铺垫的多了，直接看效果吧，三个按钮一个进度条:
初始化按钮:
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self
.playButton=[[UIButton alloc]initWithFrame:CGRectMake(40, 100, 60, 30)];
[
self
.playButton setTitle:@
"播放"
forState:UIControlStateNormal];
[
self
.playButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[
self
.playButton.titleLabel setFont:[UIFont systemFontOfSize:14]];
self
.playButton.layer.borderColor=[UIColor blackColor].CGColor;
self
.playButton.layer.borderWidth=1.0;
self
.playButton.layer.cornerRadius=5.0;
[
self
.playButton addTarget:
self
action:
@selector
(playMusic:) forControlEvents:UIControlEventTouchUpInside];
[
self
.view addSubview:
self
.playButton];
self
.pauseButton=[[UIButton alloc]initWithFrame:CGRectMake(140, 100, 60, 30)];
[
self
.pauseButton setTitle:@
"暂停"
forState:UIControlStateNormal];
[
self
.pauseButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[
self
.pauseButton.titleLabel setFont:[UIFont systemFontOfSize:14]];
self
.pauseButton.layer.borderColor=[UIColor blackColor].CGColor;
self
.pauseButton.layer.borderWidth=1.0;
self
.pauseButton.layer.cornerRadius=5.0;
[
self
.pauseButton addTarget:
self
action:
@selector
(pauseMusic:) forControlEvents:UIControlEventTouchUpInside];
[
self
.view addSubview:
self
.pauseButton];
self
.switchButton=[[UIButton alloc]initWithFrame:CGRectMake(240, 100, 60, 30)];
[
self
.switchButton setTitle:@
"切歌"
forState:UIControlStateNormal];
[
self
.switchButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[
self
.switchButton.titleLabel setFont:[UIFont systemFontOfSize:14]];
self
.switchButton.layer.borderColor=[UIColor blackColor].CGColor;
self
.switchButton.layer.borderWidth=1.0;
self
.switchButton.layer.cornerRadius=5.0;
[
self
.switchButton addTarget:
self
action:
@selector
(switchMusic:) forControlEvents:UIControlEventTouchUpInside];
[
self
.view addSubview:
self
.switchButton];
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初始化进度条:
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self
.progressView=[[UIProgressView alloc]initWithFrame:CGRectMake(40, 180, 200, 50)];
[
self
.view addSubview:
self
.progressView];
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AVAudioPlayer可以看成一个简易播放器，支持多种音频格式，能够进行进度、音量、播放速度等控制，已经满足了基本需求，接下来是播放音乐的代码:
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if
(
self
.audioPlayer.isPlaying) {
[
self
.audioPlayer pause];
}
else
{
[
self
loadMusicByAsset:[[AVURLAsset alloc] initWithURL:[[
NSBundle
mainBundle] URLForResource:@
"我最亲爱的"
withExtension:@
"mp3"
] options:
nil
]];
[
self
.audioPlayer play];
}
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实例化AVAudioPlayer:
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-(
void
)loadMusicByAsset:(AVURLAsset*)avUrlAsset {
if
([[
NSFileManager
defaultManager] fileExistsAtPath:avUrlAsset.URL.path]){
NSError
*error=
nil
;
self
.audioPlayer= [[AVAudioPlayer alloc] initWithContentsOfURL:avUrlAsset.URL error:&error];
self
.audioPlayer.delegate=
self
;
//准备buffer，减少播放延时的时间
[
self
.audioPlayer prepareToPlay];
[
self
.audioPlayer setVolume:1];
//设置音量大小
self
.audioPlayer.numberOfLoops =0;
//设置播放次数，0为播放一次，负数为循环播放
if
(error) {
NSLog
(@
"初始化错误:%@"
,error.localizedDescription);
}
}
}
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上面是通过AVURLAsset实例化的，还可以直接通过名称实例化:
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-(
void
)loadMusic:(
NSString
*)name {
NSString
*musicFilePath = [[
NSBundle
mainBundle] pathForResource:name ofType:@
"mp3"
];
//创建音乐文件路径
if
([[
NSFileManager
defaultManager] fileExistsAtPath:musicFilePath]){
NSURL
*musicURL = [[
NSURL
alloc] initFileURLWithPath:musicFilePath];
NSError
*error=
nil
;
self
.audioPlayer= [[AVAudioPlayer alloc] initWithContentsOfURL:musicURL error:&error];
self
.audioPlayer.delegate=
self
;
//准备buffer，减少播放延时的时间
[
self
.audioPlayer prepareToPlay];
[
self
.audioPlayer setVolume:1];
//设置音量大小
self
.audioPlayer.numberOfLoops =0;
//设置播放次数，0为播放一次，负数为循环播放
if
(error) {
NSLog
(@
"初始化错误:%@"
,error.localizedDescription);
}
}
}
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暂停音乐，这里为了方便单独写了一个按钮，大多数情况下，播放是暂停都是同一个按钮，仅供参考:
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-(
void
)pauseMusic:(UIButton *)sender{
if
(
self
.audioPlayer.isPlaying) {
[
self
.audioPlayer pause];
}
}
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切歌就是通常大家点的上一曲下一曲，很好理解:
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-(
void
)switchMusic:(UIButton *)sender{
[
self
.audioPlayer stop];
[
self
loadMusicByAsset:[[AVURLAsset alloc] initWithURL:[[
NSBundle
mainBundle] URLForResource:@
"我需要一美元"
withExtension:@
"mp3"
] options:
nil
]];
[
self
.audioPlayer play];
}
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通过timer实时更新进度条:
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self
.timer = [
NSTimer
scheduledTimerWithTimeInterval:0.1 target:
self
selector:
@selector
(changeProgress)
userInfo:
nil
repeats:
YES
];
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进度更新:
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-(
void
)changeProgress{
if
(
self
.audioPlayer.isPlaying) {
self
.progressView.progress =
self
.audioPlayer.currentTime/
self
.audioPlayer.duration;
}
}
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效果如下:
音乐播放完成之后可以在AVAudioPlayerDelegate的代理方法里面根据业务场景执行自己安排:
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-(
void
)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(
BOOL
)flag{
// [self.timer invalidate];直接销毁，之后不可用，慎重考虑
// [self.timer setFireDate:[NSDate date]]; //继续
// [self.timer setFireDate:[NSDate distantPast]];//开启
[
self
.timer setFireDate:[
NSDate
distantFuture]];
//暂停
}
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本文转自Fly_Elephant博客园博客，原文链接：http://www.cnblogs.com/xiaofeixiang/p/4540286.html，如需转载请自行联系原作者
