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;

 

 

//
//  AVAudioPlayerTool.h
//  IOS_0318_AVAudioPlayer
//
//  Created by ma c on 16/3/18.
//  Copyright © 2016年 博文科技. All rights reserved.
//  播放本地音乐/音效

#import <Foundation/Foundation.h>

@interface AVAudioPlayerTool : NSObject

+ (BOOL)playerMusic:(NSString *)fileName;
+ (void)pauseMusic:(NSString *)fileName;
+ (void)stopMusic:(NSString *)fileName;

@end

@interface CustomSoundsID : NSObject

///播放音效
+ (void)playerSound:(NSString *)fileName;
///销魂音效
+ (void)disposeSound:(NSString *)fileName;


@end

//
//  AVAudioPlayerTool.m
//  IOS_0318_AVAudioPlayer
//
//  Created by ma c on 16/3/18.
//  Copyright © 2016年 博文科技. All rights reserved.
//

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

@implementation AVAudioPlayerTool
///存放所有音乐文件
static NSMutableDictionary *_musicPlayers;

+ (NSMutableDictionary *)musicPlayers
{
    if(!_musicPlayers){
        _musicPlayers = [NSMutableDictionary dictionary];
        
    }
    return _musicPlayers;
}
///播放音乐
+ (BOOL)playerMusic:(NSString *)fileName
{
    //判断fileName是否为空
    if(!fileName) return NO;
    
    //1.取出对应的播放器
    AVAudioPlayer *player = [self musicPlayers][fileName];
    
    //2.如果播放器不存在，就初始化
    if (!player) {
        
        NSURL *url = [[NSBundle mainBundle] URLForResource:fileName withExtension:nil];
        //判断url是否存在
        if (!url)  return NO;
        //创建播放器（一个AVAudioPlayer只能播放一个URL）
        player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
        
        //缓冲
        if (![player prepareToPlay]) return NO;
        
        //存入字典
        [self musicPlayers][fileName] = player;

    }
    
    //3.播放
    if (!player.isPlaying) {
        [player play];
    }
    return YES;
}
///暂停音乐
+ (void)pauseMusic:(NSString *)fileName
{
    //判断fileName是否为空
    if(!fileName) return;
    
    //1.取出对应的播放器
    AVAudioPlayer *player = [self musicPlayers][fileName];
    
    //2.暂停
    if (player.isPlaying) {
        [player pause];
    }
    
}
///停止音乐
+ (void)stopMusic:(NSString *)fileName
{
    //判断fileName是否为空
    if(!fileName) return;
    
    //1.取出对应的播放器
    AVAudioPlayer *player = [self musicPlayers][fileName];
    
    //2.暂停
    [player stop];
    
    
    //3.将播放器从字典中移除
    [[self musicPlayers] removeObjectForKey:fileName];
}


@end


@implementation CustomSoundsID

///存放所有音效
static NSMutableDictionary *_soundIDs;

+ (NSMutableDictionary *)soundIDs
{
    if (!_soundIDs) {
        _soundIDs = [NSMutableDictionary dictionary];
    }
    return _soundIDs;
}


///播放音效
+ (void)playerSound:(NSString *)fileName
{
    if (!fileName)  return;
    
    //1.取出对应的音效ID
    SystemSoundID soundID = [[self soundIDs][fileName] unsignedIntValue];
    
    //2.初始化
    if (!soundID) {
        NSURL *url = [[NSBundle mainBundle] URLForResource:fileName withExtension:nil];
        
        if (!url)  return;
        AudioServicesCreateSystemSoundID((__bridge CFURLRef _Nonnull)(url), &soundID);
        
        //存入字典
        [self soundIDs][fileName] = @(soundID);
    }
    //3.播放
    AudioServicesPlayAlertSound(soundID);
}
///销魂音效
+ (void)disposeSound:(NSString *)fileName
{
    if (!fileName)  return;
    
    //1.取出对应的音效ID
    SystemSoundID soundID = [[self soundIDs][fileName] unsignedIntValue];
    
    //2.销毁
    if (soundID) {
        AudioServicesDisposeSystemSoundID(soundID);
        [[self soundIDs] removeObjectForKey:fileName];
    }
}



@end