iOS音頻功能開發（一）整理

要給工程中添加音頻,首先要導入音頻的架構 AVFoundation.framework

然後建立一個類繼承于UIViewController, 我這裡就叫FirstVC.

首先在 AppDelegate.m中初始化根視圖  demo位址------>點選打開連結

1 //
 2 //  AppDelegate.m
 3 //  YinPinShiPin
 4 //
 5 //  Created by chulijian on 14-11-8.
 6 //  Copyright (c) 2014年 company. All rights reserved.
 7 //
 8 
 9 #import "AppDelegate.h"
10 #import "FirstVC.h"
11 @implementation AppDelegate
12 
13 
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;
27     
28     self.window.backgroundColor = [UIColor whiteColor];
29     [self.window makeKeyAndVisible];
30     return YES;
31 }      

然後在FirstVC.h中導入AVFoundation架構  

1 //
 2 //  FirstVC.h
 3 //  YinPinShiPin
 4 //
 5 //  Created by chulijian on 14-11-8.       
6 //  Copyright (c) 2014年 company. All rights reserved.      
        
 7 //       

8 //      

9 //      

#import <UIKit/UIKit.h>      

10      

11 //要想使用封裝好的音頻類,導入框,導入類頭檔案,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;      //播放進度18           

UISlider *volumeSlider;         //聲音控制19           

NSTimer *timer;                 //監控音頻播放進度20      

}      

21      

22 @end      

然後在FirstVC.m裡的viewDidLoad方法裡填寫代碼   你需要導入一個音頻才可以播放 像添加圖檔一樣,直接拖到工程裡就可以了

1 - (void)viewDidLoad
 2 {
 3     [super viewDidLoad];
 4     // Do any additional setup after loading the view.
 5     //初始化三個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     //從budle路徑下讀取音頻檔案　　輕音樂 - 薩克斯回家 這個檔案名是你的歌曲名字,mp3是你的音頻格式
25     NSString *string = [[NSBundle mainBundle] pathForResource:@"輕音樂 - 薩克斯回家" ofType:@"mp3"];
26     //把音頻檔案轉換成url格式
27     NSURL *url = [NSURL fileURLWithPath:string];
28     //初始化音頻類 并且添加播放檔案
29     avAudioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
30     //設定代理
31     avAudioPlayer.delegate = self;
32     
33     //設定初始音量大小
34    // avAudioPlayer.volume = 1;
35     
36     //設定音樂播放次數  -1為一直循環
37     avAudioPlayer.numberOfLoops = -1;
38     
39     //預播放
40     [avAudioPlayer prepareToPlay];
41     
42     //初始化一個播放進度條
43     progressV = [[UIProgressView alloc] initWithFrame:CGRectMake(20, 50, 200, 20)];
44     [self.view addSubview:progressV];
46     
47     //用NSTimer來監控音頻播放進度
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     //設定最小音量
56     volumeSlider.minimumValue = 0.0f;
57     //設定最大音量
58     volumeSlider.maximumValue = 10.0f;
59     //初始化音量為多少
60     volumeSlider.value = 5.0f;
61     
62     [self.view addSubview:volumeSlider];
64 
65     //聲音開關控件(靜音)
66     UISwitch *swith = [[UISwitch alloc] initWithFrame:CGRectMake(100, 20, 60, 40)];
67     [swith addTarget:self action:@selector(onOrOff:) forControlEvents:UIControlEventValueChanged];
68     //預設狀态為打開
69     swith.on = YES;
70     [self.view addSubview:swith];
72 }      

相應的自定義方法代碼如下

1     //播放
 2 - (void)play
 3 {  
 4     [avAudioPlayer play];
 5 }
 6     //暫停
 7 - (void)pause
 8 {
 9     [avAudioPlayer pause];
10 }
11     //停止
12 - (void)stop
13 {
14     avAudioPlayer.currentTime = 0;  //目前播放時間設定為0
15     [avAudioPlayer stop];
16 }
17 //播放進度條
18 - (void)playProgress
19 {
20     //通過音頻播放時長的百分比,給progressview進行指派;
21     progressV.progress = avAudioPlayer.currentTime/avAudioPlayer.duration;
22 }
23 //聲音開關(是否靜音)
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 //播放完成時調用的方法  (代理裡的方法),需要設定代理才可以調用
36 - (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
37 {
38     [timer invalidate]; //NSTimer暫停   invalidate  使...無效;
39 }      

demo稍後會整理上傳

當然,你也可以再定義一個UISlider來控制播放進度.