iOS开发之AVAudioPlayer 音频播放

要给工程中添加音频,首先要导入音频的框架 AVFoundation.framework

然后新建一个类继承于UIViewController, 我这里就叫FirstVC.
首先在 AppDelegate.m中初始化根视图

 1 //

 2 //  AppDelegate.m

 3 //  YinPinShiPin

 4 //

 5 //  Created by VincentXue on 12-9-3.

 6 //  Copyright (c) 2012年 VincentXue. All rights reserved.

 7 //

 8 

 9 #import "AppDelegate.h"

10 #import "FirstVC.h"

11 @implementation AppDelegate

12 

13 - (void)dealloc

14 {

15     [_window release];

16     [super dealloc];

17 }

18 

19 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

20 {

21     self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];

22     // Override point for customization after application launch.

23     

24     FirstVC *firstVC = [[FirstVC alloc] init];

25     self.window.rootViewController = firstVC;

26     [firstVC release];

27     

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

29     [self.window makeKeyAndVisible];

30     return YES;

31 }

然后在FirstVC.h中导入AVFoundation框架  

 1 //

 2 //  FirstVC.h

 3 //  YinPinShiPin

 4 //

 5 //  Created by VincentXue on 12-9-3.

 6 //  Copyright (c) 2012年 VincentXue. All rights reserved.

 7 //

 8 

 9 #import <UIKit/UIKit.h>

10 

11 //要想使用封装好的音频类,导入框,导入类头文件,缺一不可;

12 #import <AVFoundation/AVFoundation.h>

13 

14 @interface FirstVC : UIViewController<AVAudioPlayerDelegate>

15 {

16     AVAudioPlayer *avAudioPlayer;   //播放器player

17     UIProgressView *progressV;      //播放进度

18     UISlider *volumeSlider;         //声音控制

19     NSTimer *timer;                 //监控音频播放进度

20 }

21 

22 @end

然后在FirstVC.m里的viewDidLoad方法里填写代码   你需要导入一个音频才可以播放 像添加图片一样,直接拖到工程里就可以了

 1 - (void)viewDidLoad

 2 {

 3     [super viewDidLoad];

 4     // Do any additional setup after loading the view.

 5     //初始化三个button

 6     UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

 7     [button setFrame:CGRectMake(100, 100, 60, 40)];

 8     [button setTitle:@"Play" forState:UIControlStateNormal];

 9     [button addTarget:self action:@selector(play) forControlEvents:UIControlEventTouchUpInside];

10     [self.view addSubview:button];

11     

12     UIButton *button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];

13     [button1 setFrame:CGRectMake(100, 150, 60, 40)];

14     [button1 setTitle:@"pause" forState:UIControlStateNormal];

15     [button1 addTarget:self action:@selector(pause) forControlEvents:UIControlEventTouchUpInside];

16     [self.view addSubview:button1];

17     

18     UIButton *button2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];

19     [button2 setFrame:CGRectMake(100, 200, 60, 40)];

20     [button2 setTitle:@"stop" forState:UIControlStateNormal];

21     [button2 addTarget:self action:@selector(stop) forControlEvents:UIControlEventTouchUpInside];

22     [self.view addSubview:button2];

23     

24     //从budle路径下读取音频文件　　轻音乐 - 萨克斯回家 这个文件名是你的歌曲名字,mp3是你的音频格式

25     NSString *string = [[NSBundle mainBundle] pathForResource:@"轻音乐 - 萨克斯回家" ofType:@"mp3"];

26     //把音频文件转换成url格式

27     NSURL *url = [NSURL fileURLWithPath:string];

28     //初始化音频类 并且添加播放文件

29     avAudioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];

30     //设置代理

31     avAudioPlayer.delegate = self;

32     

33     //设置初始音量大小

34    // avAudioPlayer.volume = 1;

35     

36     //设置音乐播放次数  -1为一直循环

37     avAudioPlayer.numberOfLoops = -1;

38     

39     //预播放

40     [avAudioPlayer prepareToPlay];

41     

42     //初始化一个播放进度条

43     progressV = [[UIProgressView alloc] initWithFrame:CGRectMake(20, 50, 200, 20)];

44     [self.view addSubview:progressV];

45     [progressV release];

46     

47     //用NSTimer来监控音频播放进度

48     timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self

49                                                      selector:@selector(playProgress)

50                                                      userInfo:nil repeats:YES];

51     //初始化音量控制

52     volumeSlider = [[UISlider alloc] initWithFrame:CGRectMake(20, 70, 200, 20)];

53     [volumeSlider addTarget:self action:@selector(volumeChange)

54                        forControlEvents:UIControlEventValueChanged];

55     //设置最小音量

56     volumeSlider.minimumValue = 0.0f;

57     //设置最大音量

58     volumeSlider.maximumValue = 10.0f;

59     //初始化音量为多少

60     volumeSlider.value = 5.0f;

61     

62     [self.view addSubview:volumeSlider];

63     [volumeSlider release];

64 

65     //声音开关控件(静音)

66     UISwitch *swith = [[UISwitch alloc] initWithFrame:CGRectMake(100, 20, 60, 40)];

67     [swith addTarget:self action:@selector(onOrOff:) forControlEvents:UIControlEventValueChanged];

68     //默认状态为打开

69     swith.on = YES;

70     [self.view addSubview:swith];

71     [swith  release];

72 }

相应的自定义方法代码如下

 1     //播放

 2 - (void)play

 3 {  

 4     [avAudioPlayer play];

 5 }

 6     //暂停

 7 - (void)pause

 8 {

 9     [avAudioPlayer pause];

10 }

11     //停止

12 - (void)stop

13 {

14     avAudioPlayer.currentTime = 0;  //当前播放时间设置为0

15     [avAudioPlayer stop];

16 }

17 //播放进度条

18 - (void)playProgress

19 {

20     //通过音频播放时长的百分比,给progressview进行赋值;

21     progressV.progress = avAudioPlayer.currentTime/avAudioPlayer.duration;

22 }

23 //声音开关(是否静音)

24 - (void)onOrOff:(UISwitch *)sender

25 {

26     avAudioPlayer.volume = sender.on;

27 }

28 

29 //播放音量控制

30 - (void)volumeChange

31 {

32    avAudioPlayer.volume = volumeSlider.value;

33 }

34 

35 //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

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

37 {

38     [timer invalidate]; //NSTimer暂停   invalidate  使...无效;

39 }

最后别忘了释放内存

1 - (void)dealloc

2 {

3     [avAudioPlayer release];

4     [progressV release];

5     [volumeSlider release];

6     [timer release];

7     [super dealloc];

8 }

当然,你也可以再定义一个UISlider来控制播放进度.

最后运行起来的就是这个样子