IOS学习笔记（五）音频视频

IOS支持的音频格式AAC,ALAC,IMA4,linear,MP3，caf（苹果推荐格式），在使用音频时需要引入AVFoundation.framework,然后使用

AVAudioPlayer类：

AVAudioPlayer *audioplayer;

NSString *filePath = [[NSBundle mainBundle]pathForResource:@"没那么简单" ofType:@"mp3"];
    NSURL *url = [[NSURL alloc]initFileURLWithPath:filePath];
    audioplayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
    audioplayer.volume = 0.5;
    [audioplayer prepareToPlay];
    audioplayer.numberOfLoops = -1;
    audioplayer.delegate = self;

还可以同过MediaPlayer.framework里的MPMusicPlayerController类来播放ipod库中自带的音乐，使用时要先使用

MPMediaPickerController从库中选择歌曲。

MPMusicPlayerController *musicPlayer;

UIDevice *device = [UIDevice currentDevice];
    NSString *model = [device model];
    NSLog(@"%@",[device model]);
    if([model isEqualToString:@"iPhone Simulator"] == NO)
    {
        MPMediaPickerController *pickController = [[MPMediaPickerController alloc] initWithMediaTypes:MPMediaTypeMusic];
        [pickController setDelegate:self];
        pickController.prompt = @"选取歌曲";//在navgationController中页可以通过设置prompt属性增加一个提示标题，当设置prompt属性后，navgationbar上会多出一行区域用于显示prompt。prompt：提示
        [pickController setAllowsPickingMultipleItems:YES];
        
        [self presentModalViewController:pickController animated:YES];
    }

 视频部分主要是用MediaPlayer.framework的MPMoviePlayerViewController类来播放，这里要说一下MPMoviePlayerViewController和MPMoviePlayerController的区别，苹果起初用MPMoviePlayerController播放视频，但是MPMoviePlayerController只能进行全屏播放，很不方便，后来苹果就加入了MPMoviePlayerViewController。但是这个累的API相当简单，只有一个MPMoviePlayerController类的moviePlayer属性。但是现在已经可以通过设置moviePlayer的view属性来进行窗口播放了

[moviePlayer.moviePlayer viewsetFrame:CGRectMake(10, 10, 300, 300)];

 NSString * filePath = [[NSBundle mainBundle] pathForResource:@"tta" ofType:@"mp4"];
    NSURL * url = [NSURL fileURLWithPath:filePath];
    moviePlayer = [[MPMoviePlayerViewController alloc] initWithContentURL:url];
    [moviePlayer.moviePlayer setShouldAutoplay:NO];
    [moviePlayer.moviePlayer setControlStyle:MPMovieControlStyleNone];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(doFinished:) name:MPMoviePlayerPlaybackDidFinishNotification object:nil];