播放音乐

作品链接：
http://www.jianshu.com/users/1e0f5e6f73f6/top_articles

1.导入框架

#import <AVFoundation/AVFoundation.h>

2.初始化字典

static NSMutableDictionary *_players;
+ (void)initialize
{
    _players = [NSMutableDictionary dictionary];
}

3.点击事件的处理

// 开始播放
- (IBAction)start {
    [PHAudioTool playMusicWithSoundName:@"播放文件名称"];
}
//暂停播放
- (IBAction)pause {
    [PHAudioTool pauseMusicWithSoundName:@"播放文件名称"];
}
//停止播放
- (IBAction)stop {
    [PHAudioTool stopMusicWithSoundName:@"播放文件名称"];
}

4.播放音乐

+ (void)playMusicWithSoundName:(NSString *)fileName
{
    // 1.创建空播放器
    AVAudioPlayer *player = nil;
    // 2.从字典中取出播放器
    player = _players[fileName];
    // 3.判断字典是否为空
    if (player == nil) {
        // 4.生成对应的音乐文件
        NSURL *fileUrl = [[NSBundle mainBundle] URLForResource:fileName withExtension:nil];
        // 5.创建对应的播放器
        player = [[AVAudioPlayer alloc] initWithContentsOfURL:fileUrl error:nil];
        // 6.保存到字典中
        [_players setObject:player forKey:fileName];
        // 7.准备播放
        [player prepareToPlay];
    }
    // 8.开始播放
    [player play];
}

5.暂停音乐

+ (void)pauseMusicWithSoundName:(NSString *)fileName
{
    // 1.从字典中取出播放器
    AVAudioPlayer *player = _players[fileName];
    // 2.暂停音乐
    if (player) {
        [player pause];
    }
}

6.停止音乐

+ (void)stopMusicWithSoundName:(NSString *)fileName
{
    // 1.从字典中取出播放器
    AVAudioPlayer *player = _players[fileName];
    // 2.停止音乐
    if (player) {
        [player stop];
        [_players removeObjectForKey:fileName];
        player = nil;
    }

```
 注意：AVAudioPlayer播放值适用于本地文件
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