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 AppDelegate12 13 - (void)dealloc14 {15     [_window release];16     [super dealloc];17 }18 19 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions20 {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player17     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:self49                                                      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)stop13 {14     avAudioPlayer.currentTime = 0;  //当前播放时间设置为015     [avAudioPlayer stop];16 }17 //播放进度条18 - (void)playProgress19 {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 *)sender25 {26     avAudioPlayer.volume = sender.on;27 }28 29 //播放音量控制30 - (void)volumeChange31 {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)flag37 {38     [timer invalidate]; //NSTimer暂停   invalidate  使...无效;39 }

最后别忘了释放内存

1 - (void)dealloc2 {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