IOS开发中AVFoundation中AVAudioPlayer的使用

IOS开发中如何调用音频播放组件

 

1、与音频相关的头文件等都在AVFoundation.h中,所以第一步是添加音频库文件:

#import <AVFoundation/AVFoundation.h>

 

2、先找一段要播放的音频文件,我这里找到是一个mp3文件,然后添加到项目中:

 

3、使用NSBundle获取这个文件并转化成NSData类型:

 NSString *filepath = [[NSBundle mainBundle]pathForResource:@"bbb" ofType:@"mp3"];
 NSData *data = [[NSData data]initWithContentsOfFile:filepath];

 

4、声明一个全局变量的AVAudioPlayer对象player:

@interface ViewController (){
    AVAudioPlayer *player;
}

@end

 

5、初始化全局变量player:

 player = [[AVAudioPlayer alloc]initWithData:data error:nil];

 

6、添加一个开始、暂停播放的按钮:

   UIButton *myBtn = [[UIButton alloc]initWithFrame:CGRectMake(100, 200, 214, 80)];
    myBtn.backgroundColor = [UIColor orangeColor];
    myBtn.layer.cornerRadius = 20;
    myBtn.layer.masksToBounds = YES;
    myBtn.enabled = YES;
    [myBtn setTitle:@"开始播放" forState:UIControlStateNormal];
    [myBtn addTarget:self action:@selector(myBtnAction:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:myBtn];

 

7、编写按钮的方法,点击按钮之后检测player是否在播放,如果在播放,就停止播放,如果未播放,就开始播放,其中停止播放和开始播放调用的是player对象的play方法和pause方法:

-(void)myBtnAction :(UIButton*)sender{
    
    if (player.playing) {
        [player pause];
        [sender setTitle:@"开始按钮" forState:UIControlStateNormal];
    }else{
       [player play];
        [sender setTitle:@"暂停按钮" forState:UIControlStateNormal];
    }
}

 

8、添加一个音量滑块,音量滑块添加一个方法volumeslidervaluechange:,当值改变时触发这个方法:

//    音量滑块
    UISlider *volumeslider = [[UISlider alloc]initWithFrame:CGRectMake(20, 330, 374, 20)];
    volumeslider.value = 0.9;
    [volumeslider addTarget:self action:@selector(volumeslidervaluechange:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:volumeslider];

 

9、实现volumeslidervaluechange:方法,当滑块值改变时,改变音频播放器的音量大小:

-(void)volumeslidervaluechange:(UISlider*)sender{
    player.volume = sender.value;
}

 

模拟运行并点击按钮就可以听到美妙的音乐了:

 

 以下是完整代码:

//
//  ViewController.m
//  ceshi
//
//  Created by mac on 16/5/24.
//  Copyright © 2016年 mzw. All rights reserved.
//

#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>

@interface ViewController (){
    AVAudioPlayer *player;
}

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
//    设置当前view背景色
    self.view.backgroundColor = [UIColor lightGrayColor];
    
    
//    获取项目树中的音频文件
    NSString *filepath = [[NSBundle mainBundle]pathForResource:@"bbb" ofType:@"mp3"];
//    把获取的音频文件转化为nsdata类型
    NSData *data = [[NSData data]initWithContentsOfFile:filepath];
    
//    初始化一个音频播放器
    player = [[AVAudioPlayer alloc]initWithData:data error:nil];

    
//    创建一个button,点击button开始或暂停音频播放器的播放
    UIButton *myBtn = [[UIButton alloc]initWithFrame:CGRectMake(100, 200, 214, 80)];
    myBtn.backgroundColor = [UIColor orangeColor];
    myBtn.layer.cornerRadius = 20;
    myBtn.layer.masksToBounds = YES;
    myBtn.enabled = YES;
    [myBtn setTitle:@"开始播放" forState:UIControlStateNormal];
    [myBtn addTarget:self action:@selector(myBtnAction:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:myBtn];
    
    
    //    音量滑块
    UISlider *volumeslider = [[UISlider alloc]initWithFrame:CGRectMake(20, 330, 374, 20)];
    volumeslider.value = 0.9;
    [volumeslider addTarget:self action:@selector(volumeslidervaluechange:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:volumeslider];
    


}


-(void)myBtnAction :(UIButton*)sender{
//    如果音频播放器处于播放状态,点击后就暂停播放,如果处于未播放状态,就开始播放
    if (player.playing) {
        [player pause];
        [sender setTitle:@"开始按钮" forState:UIControlStateNormal];
    }else{
       [player play];
        [sender setTitle:@"暂停按钮" forState:UIControlStateNormal];
    }
}

-(void)volumeslidervaluechange:(UISlider*)sender{
    player.volume = sender.value;
}


@end

 

 

posted @ 2016-05-24 10:51  jiwangbujiu  阅读(8946)  评论(0编辑  收藏  举报