IOS-音乐

一、音乐的播放

音乐播放用到一个叫做AVAudioPlayer的类, 能够用于播放本地音频文件

AVAudioPlayer常用方法

加载音乐文件

- (id)initWithContentsOfURL:(NSURL *)url error:(NSError **)outError;

- (id)initWithData:(NSData *)data error:(NSError **)outError;

准备播放（缓冲，提高播放的流畅性）

- (BOOL)prepareToPlay;

播放（异步播放）

- (BOOL)play;

暂停

- (void)pause;

停止

- (void)stop;

是否正在播放

@property(readonly, getter=isPlaying) BOOL playing;

时长

@property(readonly) NSTimeInterval duration;

当前的播放位置

@property NSTimeInterval currentTime;

播放次数（-1代表无限循环播放，其他代表播放numberOfLoops+1次）

@property NSInteger numberOfLoops;

音量

@property float volume;

是否允许更改速率

@property BOOL enableRate;

播放速率（1是正常速率，0.5是一般速率，2是双倍速率）

@property float rate;

有多少个声道

@property(readonly) NSUInteger numberOfChannels;

 1 //
 2 //  AVAudioPlayerTool.h
 3 //  IOS_0318_AVAudioPlayer
 4 //
 5 //  Created by ma c on 16/3/18.
 6 //  Copyright © 2016年 博文科技. All rights reserved.
 7 //  播放本地音乐/音效
 8
 9 #import <Foundation/Foundation.h>
10
11 @interface AVAudioPlayerTool : NSObject
12
13 + (BOOL)playerMusic:(NSString *)fileName;
14 + (void)pauseMusic:(NSString *)fileName;
15 + (void)stopMusic:(NSString *)fileName;
16
17 @end
18
19 @interface CustomSoundsID : NSObject
20
21 ///播放音效
22 + (void)playerSound:(NSString *)fileName;
23 ///销魂音效
24 + (void)disposeSound:(NSString *)fileName;
25
26
27 @end

  1 //
  2 //  AVAudioPlayerTool.m
  3 //  IOS_0318_AVAudioPlayer
  4 //
  5 //  Created by ma c on 16/3/18.
  6 //  Copyright © 2016年 博文科技. All rights reserved.
  7 //
  8
  9 #import "AVAudioPlayerTool.h"
 10 #import <AVFoundation/AVFoundation.h>
 11
 12 @implementation AVAudioPlayerTool
 13 ///存放所有音乐文件
 14 static NSMutableDictionary *_musicPlayers;
 15
 16 + (NSMutableDictionary *)musicPlayers
 17 {
 18     if(!_musicPlayers){
 19         _musicPlayers = [NSMutableDictionary dictionary];
 20
 21     }
 22     return _musicPlayers;
 23 }
 24 ///播放音乐
 25 + (BOOL)playerMusic:(NSString *)fileName
 26 {
 27     //判断fileName是否为空
 28     if(!fileName) return NO;
 29
 30     //1.取出对应的播放器
 31     AVAudioPlayer *player = [self musicPlayers][fileName];
 32
 33     //2.如果播放器不存在，就初始化
 34     if (!player) {
 35
 36         NSURL *url = [[NSBundle mainBundle] URLForResource:fileName withExtension:nil];
 37         //判断url是否存在
 38         if (!url)  return NO;
 39         //创建播放器（一个AVAudioPlayer只能播放一个URL）
 40         player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
 41
 42         //缓冲
 43         if (![player prepareToPlay]) return NO;
 44
 45         //存入字典
 46         [self musicPlayers][fileName] = player;
 47
 48     }
 49
 50     //3.播放
 51     if (!player.isPlaying) {
 52         [player play];
 53     }
 54     return YES;
 55 }
 56 ///暂停音乐
 57 + (void)pauseMusic:(NSString *)fileName
 58 {
 59     //判断fileName是否为空
 60     if(!fileName) return;
 61
 62     //1.取出对应的播放器
 63     AVAudioPlayer *player = [self musicPlayers][fileName];
 64
 65     //2.暂停
 66     if (player.isPlaying) {
 67         [player pause];
 68     }
 69
 70 }
 71 ///停止音乐
 72 + (void)stopMusic:(NSString *)fileName
 73 {
 74     //判断fileName是否为空
 75     if(!fileName) return;
 76
 77     //1.取出对应的播放器
 78     AVAudioPlayer *player = [self musicPlayers][fileName];
 79
 80     //2.暂停
 81     [player stop];
 82
 83
 84     //3.将播放器从字典中移除
 85     [[self musicPlayers] removeObjectForKey:fileName];
 86 }
 87
 88
 89 @end
 90
 91
 92 @implementation CustomSoundsID
 93
 94 ///存放所有音效
 95 static NSMutableDictionary *_soundIDs;
 96
 97 + (NSMutableDictionary *)soundIDs
 98 {
 99     if (!_soundIDs) {
100         _soundIDs = [NSMutableDictionary dictionary];
101     }
102     return _soundIDs;
103 }
104
105
106 ///播放音效
107 + (void)playerSound:(NSString *)fileName
108 {
109     if (!fileName)  return;
110
111     //1.取出对应的音效ID
112     SystemSoundID soundID = [[self soundIDs][fileName] unsignedIntValue];
113
114     //2.初始化
115     if (!soundID) {
116         NSURL *url = [[NSBundle mainBundle] URLForResource:fileName withExtension:nil];
117
118         if (!url)  return;
119         AudioServicesCreateSystemSoundID((__bridge CFURLRef _Nonnull)(url), &soundID);
120
121         //存入字典
122         [self soundIDs][fileName] = @(soundID);
123     }
124     //3.播放
125     AudioServicesPlayAlertSound(soundID);
126 }
127 ///销魂音效
128 + (void)disposeSound:(NSString *)fileName
129 {
130     if (!fileName)  return;
131
132     //1.取出对应的音效ID
133     SystemSoundID soundID = [[self soundIDs][fileName] unsignedIntValue];
134
135     //2.销毁
136     if (soundID) {
137         AudioServicesDisposeSystemSoundID(soundID);
138         [[self soundIDs] removeObjectForKey:fileName];
139     }
140 }
141
142
143
144 @end