iPhone开发之AVAudioPlayer 音频播放

首先，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

//

// AppDelegate.m

// YinPinShiPin

//

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

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

//

#import "AppDelegate.h"

#import "FirstVC.h"

@implementation AppDelegate

- (void)dealloc

{

[_window release];

[super dealloc];

}

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

{

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

// Override point for customization after application launch.

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

self.window.rootViewController = firstVC;

[firstVC release];

self.window.backgroundColor = [UIColor whiteColor];

[self.window makeKeyAndVisible];

return YES;

}

然后在FirstVC.h中导入AVFoundation框架

//

// FirstVC.h

// YinPinShiPin

//

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

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

//

#import <UIKit/UIKit.h>

//要想使用封装好的音频类,导入框,导入类头文件,缺一不可;

#import <AVFoundation/AVFoundation.h>

@interface FirstVC : UIViewController<AVAudioPlayerDelegate>

{

AVAudioPlayer *avAudioPlayer; //播放器player

UIProgressView *progressV; //播放进度

UISlider *volumeSlider; //声音控制

NSTimer *timer; //监控音频播放进度

}

@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

- (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];

//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

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

}

相应的自定义方法代码如下

//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;

}

最后别忘了释放内存

- (void)dealloc

{

[avAudioPlayer release];

[progressV release];

[volumeSlider release];

[timer release];

[super dealloc];

}

当然,你也可以再定义一个UISlider来控制播放进度.