一个简单的混音播放器，处理中断

简单的来说其实就是创建多个播放器，分别设置播放器的声道，音量，速率，已达到混音的效果，难度不大，简单的封装一下。

文件目录如下

AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    AVAudioSession * session = [AVAudioSession sharedInstance];
    NSError * error;
    
    if (![session setCategory:AVAudioSessionCategoryPlayback error:&error]) {
        NSLog(@"Category Error : %@", [error localizedDescription]);
    }
    if (![session setActive:YES error:&error]) {
        NSLog(@"Category Error : %@", [error localizedDescription]);
    }
    
    
    
    // Override point for customization after application launch.
    return YES;
}

　　

封装的类

//
//  SiPlayerController.h
//  Player
//
//  Created by Silence on 16/1/26.
//  Copyright © 2016年 Silence. All rights reserved.
//

#import <Foundation/Foundation.h>


@protocol SiPlayerControllerDelegate <NSObject>

- (void)playbackStop;

- (void)playbackBegan;

@end



@interface SiPlayerController : NSObject

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


@property (nonatomic, weak) id <SiPlayerControllerDelegate> delegate;


//方法
- (void)play;

- (void)stop;

//播放速率
- (void)adjustRate:(float)rate;

//对player环绕声设置，取值范围（-1.0极左 ~ 1.0极有右，0.0中间）
- (void)adjustPan:(float)pan forPlayerAtIndex:(NSUInteger)index;

//音量大小设置
- (void)adjustVolume:(float)volume forPlayerAtIndex:(NSUInteger)index;

@end

　　

//
//  SiPlayerController.m
//  Player
//
//  Created by Silence on 16/1/26.
//  Copyright © 2016年 Silence. All rights reserved.
//

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

@interface SiPlayerController()

@property (nonatomic) BOOL playing;
@property (nonatomic, strong) NSArray * playersArray;



@end


@implementation SiPlayerController

- (instancetype)init
{
    self = [super init];
    if (self) {
        AVAudioPlayer * play1 = [self playForFile:@"1"];
        AVAudioPlayer * play2 = [self playForFile:@"2"];
        _playersArray = @[play1, play2];
        
        
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleInterruption:) name:AVAudioSessionInterruptionNotification object:[AVAudioSession sharedInstance]];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleRouteChanged:) name:AVAudioSessionRouteChangeNotification object:[AVAudioSession sharedInstance]];
        
        
        
    }
    return self;
}

- (void)dealloc{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}


- (void)handleRouteChanged:(NSNotification *)notification{
    NSDictionary * dict = notification.userInfo;
    AVAudioSessionRouteChangeReason reason = [dict[AVAudioSessionRouteChangeReasonKey] unsignedIntegerValue];
    
    if (reason == AVAudioSessionRouteChangeReasonOldDeviceUnavailable) {
        
        AVAudioSessionRouteDescription * previousRoute = dict[AVAudioSessionRouteChangePreviousRouteKey];
        
        AVAudioSessionPortDescription * previousOutput = previousRoute.outputs[0];
        
        NSString * portType = previousOutput.portType;
        
        
        if ([portType isEqualToString:AVAudioSessionPortHeadphones]) {
            [self stop];
            [self.delegate playbackStop];
        }
    }
}



- (void)handleInterruption:(NSNotification *)notification{
    NSDictionary * dict = notification.userInfo;
    AVAudioSessionInterruptionType type = [dict[AVAudioSessionInterruptionTypeKey] unsignedIntegerValue];
    
    if (type == AVAudioSessionInterruptionTypeBegan) {
        //处理中断开始
        [self stop];
        if (self.delegate) {
            [self.delegate playbackStop];
        }
    }else{
        //处理中断结束
        AVAudioSessionInterruptionOptions options = [dict[AVAudioSessionInterruptionTypeKey] unsignedIntegerValue];
        
        if (options == AVAudioSessionInterruptionOptionShouldResume) {
            [self play];
            if (self.delegate) {
                [self.delegate playbackBegan];
            }
        }
    }
}


- (AVAudioPlayer *)playForFile:(NSString *)name{
    
    NSURL * url = [[NSBundle mainBundle] URLForResource:name withExtension:@"mp3"];
    NSError * error;
    AVAudioPlayer * player = [[AVAudioPlayer alloc]initWithContentsOfURL:url error:&error];
    
    if (player) {
        //循环计数为-1
        player.numberOfLoops = -1;
        //可以对播放熟虑进行设置
        player.enableRate = YES;
        [player prepareToPlay];
    }else{
        NSLog(@"Create Player Error: %@", [error localizedDescription]);
    }
    return player;
}


- (void)play{
    if (!self.playing) {
        NSTimeInterval delayTime = [self.playersArray[0] deviceCurrentTime] + 0.01;
        for (AVAudioPlayer * player in self.playersArray) {
            [player playAtTime:delayTime];
        }
        self.playing = YES;
    }
}

- (void)stop{
    if (self.playing) {
        for (AVAudioPlayer * player in self.playersArray) {
            [player stop];
            player.currentTime = 0.0f;
        }
        self.playing = NO;
    }
}

- (void)adjustRate:(float)rate{
    for (AVAudioPlayer * player in self.playersArray) {
        player.rate = rate;
    }
}

- (BOOL)isValidIndex:(NSUInteger)index{
    return index == 0 || index < self.playersArray.count;
}

- (void)adjustPan:(float)pan forPlayerAtIndex:(NSUInteger)index{
    if ([self isValidIndex:index]) {
        AVAudioPlayer * player = self.playersArray[index];
        player.pan = pan;
    }
}

- (void)adjustVolume:(float)volume forPlayerAtIndex:(NSUInteger)index{
    if ([self isValidIndex:index]) {
        AVAudioPlayer * player = self.playersArray[index];
        player.volume = volume;
    }
}



@end

　　

ViewController

//
//  ViewController.m
//  Player
//
//  Created by Silence on 16/1/26.
//  Copyright © 2016年 Silence. All rights reserved.
//

#import "ViewController.h"
#import "SiPlayerController.h"

@interface ViewController ()

@property (nonatomic, strong)SiPlayerController * player;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    _player = [[SiPlayerController alloc]init];
    
    // Do any additional setup after loading the view, typically from a nib.
}



- (IBAction)playerOnePan:(UISlider *)sender {
    [_player adjustPan:sender.value forPlayerAtIndex:0];
    
}



- (IBAction)playerTwoPan:(UISlider *)sender {
    [_player adjustPan:sender.value forPlayerAtIndex:1];
}



- (IBAction)playerOneVolume:(UISlider *)sender {
    [_player adjustVolume:sender.value forPlayerAtIndex:0];
}



- (IBAction)playerTwoVolume:(UISlider *)sender {
    [_player adjustVolume:sender.value forPlayerAtIndex:1];
}


- (IBAction)playButtonDidClick:(id)sender {
    
    [_player play];
}


- (IBAction)stopButtonDidClick:(id)sender {
    [_player stop];
}

- (IBAction)changeRate:(UISlider *)sender {
    [_player adjustRate:sender.value];
}



- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

　　

StoryBoard

在Info.Plist中添加

 

这样一个简单的播放器就实现了，同时能处理一些中断的事件