IOS使用AVAudioPlayer播放mp3歌曲文件并监听来电打断

本实例实现了AVAudioPlayer播放mp3歌曲文件，实现了播放、暂停、继续操作，音乐音量控制、播放进度显示，同时监听来电打断事件

一、控件初始化

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    //初始化三个button
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [button setFrame:CGRectMake(100, 100, 60, 40)];
    [button setTitle:@"Play" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(play) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];

    UIButton *button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [button1 setFrame:CGRectMake(100, 150, 60, 40)];
    [button1 setTitle:@"pause" forState:UIControlStateNormal];
    [button1 addTarget:self action:@selector(pause) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button1];

    UIButton *button2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [button2 setFrame:CGRectMake(100, 200, 60, 40)];
    [button2 setTitle:@"stop" forState:UIControlStateNormal];
    [button2 addTarget:self action:@selector(stop) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button2];

    NSString *string = [[NSBundle mainBundle] pathForResource:@"陶钰玉 - 深夜地下铁" ofType:@"mp3"];
    //把音频文件转换成url格式
    NSURL *url = [NSURL fileURLWithPath:string];
    //初始化音频类 并且添加播放文件
    avAudioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
    //设置代理
    avAudioPlayer.delegate = self;

    //设置初始音量大小
    // avAudioPlayer.volume = 1;

    //设置音乐播放次数  -1为一直循环
    avAudioPlayer.numberOfLoops = -1;

    //预播放
    [avAudioPlayer prepareToPlay];

    //初始化一个播放进度条
    progressV = [[UIProgressView alloc] initWithFrame:CGRectMake(20, 50, 200, 20)];
    [self.view addSubview:progressV];
    //[progressV release];

    //用NSTimer来监控音频播放进度
    timer = [NSTimer scheduledTimerWithTimeInterval:0.1
                                                    target:self
                                                    selector:@selector(playProgress)                                                     userInfo:nil
                                                    repeats:YES];
    //初始化音量控制
    volumeSlider = [[UISlider alloc] initWithFrame:CGRectMake(20, 70, 200, 20)];
    [volumeSlider addTarget:self action:@selector(volumeChange)
                           forControlEvents:UIControlEventValueChanged];
    //设置最小音量
    volumeSlider.minimumValue = 0.0f;
    //设置最大音量
    volumeSlider.maximumValue = 10.0f;
    //初始化音量为多少
    volumeSlider.value = 5.0f;

    [self.view addSubview:volumeSlider];
    //[volumeSlider release];

    //声音开关控件(静音)
    UISwitch *swith = [[UISwitch alloc] initWithFrame:CGRectMake(100, 20, 60, 40)];
    [swith addTarget:self action:@selector(onOrOff:) forControlEvents:UIControlEventValueChanged];
    //默认状态为打开
    swith.on = YES;
    [self.view addSubview:swith];
    //[swith  release];
}

播放控制

//播放
- (void)play
{
    [avAudioPlayer play];
}
//暂停
- (void)pause
{
     [avAudioPlayer pause];
}
//停止
- (void)stop
{
     avAudioPlayer.currentTime = 0;  //当前播放时间设置为0
     [avAudioPlayer stop];
}
//播放进度条
- (void)playProgress
{
     //通过音频播放时长的百分比,给progressview进行赋值;
     progressV.progress = avAudioPlayer.currentTime/avAudioPlayer.duration;
}
//声音开关(是否静音)
- (void)onOrOff:(UISwitch *)sender
{
     avAudioPlayer.volume = sender.on;
}

//播放音量控制
- (void)volumeChange
{
    avAudioPlayer.volume = volumeSlider.value;
}

//播放完成时调用的方法  (代理里的方法),需要设置代理才可以调用
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
{
    [timer invalidate]; //NSTimer暂停   invalidate  使...无效;
}

二、调用播放器并监听来电打断事件

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.

    AVAudioSession *session = [AVAudioSession sharedInstance];
    [session setActive:YES error:nil];
    [session setCategory:AVAudioSessionCategoryPlayback error:nil];
     firstVC = [[FirstVC alloc] init];
     self.window.rootViewController = firstVC;
    [firstVC viewDidLoad];
    [firstVC play];

     self.window.backgroundColor = [UIColor whiteColor];
     [self.window makeKeyAndVisible];

    AudioSessionInitialize(NULL, NULL, interruptionListenner, (__bridge void*)self);

     return YES;
}

void interruptionListenner(void* inClientData, UInt32 inInterruptionState)
{
    ZTAppDelegate* pTHIS = (__bridge ZTAppDelegate*)inClientData;
    if (pTHIS) {
        NSLog(@"interruptionListenner %lu", inInterruptionState);
        if (kAudioSessionBeginInterruption == inInterruptionState) {
            NSLog(@"Begin interruption");
            [pTHIS.self.firstVC pause];
        }
        else
        {
            NSLog(@"Begin end interruption");
            [pTHIS.self.firstVC play];
            NSLog(@"End end interruption");
        }

    }
}

代码是参考网上现有质料并稍加改动

源码下载地址：http://pan.baidu.com/s/1eP29x