iPhone/iPad高级应用与手游开发学习笔记：AVAudioPlayer学习(音频播放demo)

AVAudioPlayer是一个属于AVFoundation.framework的类，它的作用类似于一个功能强大的播放器，AVAudioPlayer支持广泛的音频格式。

一，新建一个simple view工程

二，在新建的工程中导入AVFoundation.framework库

三，再storyboard中拖入两个button，一个progress和一个label，如下图所示：

四，ViewController头文件的代码：

#import <UIKit/UIKit.h>

#import <AVFoundation/AVFoundation.h>

@interface FKViewController :UIViewController<AVAudioPlayerDelegate>

@property(strong, nonatomic)IBOutlet UIButton *bn1;

@property(strong, nonatomic)IBOutlet UIButton *bn2;

@property(strong, nonatomic)IBOutlet UILabel *show;

@property(strong, nonatomic)IBOutlet UIProgressView *prog;

-(IBAction)play:(id)sender;

-(IBAction)stop:(id)sender;

@end

五，ViewController实现类:

#import "FKViewController.h"

#import <AVFoundation/AVFoundation.h>

@interface FKViewController ()

@end

@implementation FKViewController

AVAudioPlayer *audioPlayer;

UIImage *playImage;

UIImage *pauseImage;

UIImage *stopImage;

CGFloat durationTime;

NSTimer *timer;

- (void)viewDidLoad

{

    [superviewDidLoad];

    playImage = [UIImageimageNamed:@"play.png"];

    pauseImage = [UIImageimageNamed:@"pause.png"];

    stopImage = [UIImageimageNamed:@"stop.png"];

    //为两个按钮设置图片

    [self.bn1setImage:playImageforState:UIControlStateNormal];

    [self.bn2setImage:stopImageforState:UIControlStateNormal];

    //获取要播放的音频文件的URL

    NSURL *fileURL = [[NSBundlemainBundle] URLForResource:@"star"withExtension:@"mp3"];

    //创建AVAudioPlayer对象

    audioPlayer = [[AVAudioPlayeralloc] initWithContentsOfURL:fileURLerror:nil];

    NSString *msg = [NSStringstringWithFormat:@"音频文件的声道数：%d\n音频文件的持续时间：%g",audioPlayer.numberOfChannels,audioPlayer.duration];

    self.show.text = msg;

    durationTime = audioPlayer.duration;

    //将循环次数设为-1，用于指定该音频文件循环播放

    //audioPlayer.numberOfLoops = -1;

    audioPlayer.delegate =self;

}

-(void) audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag

{

    if(player == audioPlayer && flag) {

        NSLog(@"播放完毕！！");

        [self.bn1setImage:playImageforState:UIControlStateNormal];

    }

}

-(void) audioPlayerBeginInterruption:(AVAudioPlayer *)player

{

    if(player == audioPlayer) {

        NSLog(@"被中断！");

    }

}

-(IBAction)play:(id)sender

{

    //如果当前正在播放

    if(audioPlayer.playing) {

        //暂停播放

        [audioPlayer pause];

        [sender setImage:playImageforState:UIControlStateNormal];

    } else {

        //播放音频

        [audioPlayer play];

        [sender setImage:pauseImageforState:UIControlStateNormal];

    }

    

    //如果timer为nil，执行如下方法

    if(timer == nil) {

        //周期性的执行某个方法

        timer = [NSTimerscheduledTimerWithTimeInterval:0.1target:selfselector:@selector(updateProg)userInfo:nilrepeats:YES];

    }

}

-(IBAction)stop:(id)sender

{

    //定制播放音频

    [audioPlayer stop];

    [timerinvalidate];

    timer = nil;

}

-(void) updateProg

{

    self.prog.progress =audioPlayer.currentTime/durationTime;

}

- (void)didReceiveMemoryWarning

{

    [superdidReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end

六，最后再把用到的图片加上,音乐文件大家可以自己随便找个mp3都可以：

七，最后效果：