AVAudioPlayer播放并实现了后台播放和远程控制

//  ViewController.h

#import <UIKit/UIKit.h>

#import <AVFoundation/AVFoundation.h> 

@class AVAudioPlayer;

@interface PlayViewController : UIViewController<AVAudioPlayerDelegate>

@property(nonatomic, strong) AVAudioPlayer *player;

+ (PlayViewController *)defaultPlayVC; //将该播放页面定义成单例

@end

//  ViewController.m

#import "PlayViewController.h"

@interface PlayViewController ()

@property (retain, nonatomic) IBOutlet UIButton *suspendBtn;  //暂停按钮

@property (retain, nonatomic) IBOutlet UIButton *formerBtn;   //上一首按钮

@property (retain, nonatomic) IBOutlet UIButton *nextBtn; //下一首按钮

@property (retain, nonatomic) IBOutlet UISlider *slider;  //滑块

@property (retain, nonatomic) NSArray *musicUrlArray; //音乐网址数组

@property (retain, nonatomic) NSArray *musicAllTimeArray; //音乐时间数组

@property (retain, nonatomic) NSTimer *timer;  //计时器

@property (assign, nonatomic) int currentIndex; //当前音频下标

@end

@implementation PlayViewController

#pragma mark 单例初始化方法

+ (PlayViewController *)defaultPlayVC {

    static PlayViewController *playVC = nil;

    static dispatch_once_t onceToken;

    dispatch_once(&onceToken, ^{

        playVC = [[PlayViewController alloc] init];

    });

    return playVC;

}

- (void)viewDidLoad {

    [super viewDidLoad];

    self.currentIndex = 0;

    self.musicUrlArray = [NSArray arrayWithObjects:@"http://fdfs.xmcdn.com/group10/M08/D4/2E/wKgDaVZ9EYaQ-j48AFIOaAXL-wM019.mp3",

                          @"http://fdfs.xmcdn.com/group13/M09/D4/17/wKgDXVZ6fR2wR1E8AFuO_VClRZA066.mp3",

                          @"http://fdfs.xmcdn.com/group16/M0A/D5/16/wKgDbFZ89SqyFGWGAHoEKd7yPsw709.mp3",

                          @"http://fdfs.xmcdn.com/group8/M01/D4/34/wKgDYFZ6y1nR6QpZAEDVy7rUTTc247.mp3",

                          @"http://fdfs.xmcdn.com/group9/M00/D4/EF/wKgDZlZ7aLGCQEEDAHMsQsurq_Y170.mp3",

                          @"http://fdfs.xmcdn.com/group12/M07/D4/C4/wKgDW1Z70rWxoDA7ABAp1lwS5nI990.mp3", nil];

    self.musicAllTimeArray = [NSArray arrayWithObjects:@(1344.36), @(1500.04), @(1999.06), @(1062.22), @(1886.96), @(264.76), nil];

    //滑块

    self.slider.minimumValue = 0;

    [self.slider addTarget:self action:@selector(changValue:) forControlEvents:UIControlEventValueChanged];  //添加滑动事件

    [self.slider setThumbImage:[UIImage imageNamed:@"playProcessDot_n"]forState:UIControlStateNormal];

    //播放音频之前先要设置AVAudioSession模式 是它可以后台播放

    //并且要在plist文件中 添加required background modes这个key项，并选择"App plays audio or streams audio/video using AirPlay"这个value项。

    AVAudioSession *session = [AVAudioSession sharedInstance];

    [session setCategory:AVAudioSessionCategoryPlayback error:nil];

    [session setActive:YES error:nil];

    [self playerCurrentMusic];

}

-(void)playerCurrentMusic {

    //创建串行队列 (放入线程中,免得页面假死)

    dispatch_queue_t serialQueue = dispatch_queue_create("com.audio.www", DISPATCH_QUEUE_SERIAL);

    dispatch_async(serialQueue, ^{

        NSString *url = self.musicUrlArray[self.currentIndex];

        NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]];

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

        self.player.delegate = self;

        [self.player prepareToPlay];

        [self.player play];

        //滑块

        CGFloat allTime = [self.musicAllTimeArray[self.currentIndex] floatValue];

        self.slider.maximumValue = allTime;

        //计时器只能在主线程中

        dispatch_async(dispatch_get_main_queue(), ^{

            self.timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(reloadAction) userInfo:nil repeats:YES];

        });

    });

}

#pragma mark -- 每1秒 给进度条赋一次值

-(void)reloadAction {

    if ([self.player isPlaying]) {

        self.slider.value = self.player.currentTime;

    }

}

#pragma mark 点击暂停

- (IBAction)suspendAction:(UIButton *)sender {

    sender.selected = !sender.selected;

    if (sender.selected) {

        [self.player pause]; //暂停

        [sender setTitle:@"播放" forState:UIControlStateSelected];

    } else {

        [self.player play];  //播放

        [sender setTitle:@"暂停" forState:UIControlStateNormal];

    }

}

#pragma mark 点击上一首

- (IBAction)formerAction:(UIButton *)sender {

    [self myPlayFormer]; //播放上一首

}

#pragma mark 点击下一首

- (IBAction)nextAction:(UIButton *)sender {

    [self myPlayNext];  //播放下一首

}

#pragma mark 上一首

-(void)myPlayFormer {

    if (self.currentIndex > 0) {

        [self.player pause];

        self.currentIndex--;

        [self playerCurrentMusic];

    }

}

#pragma mark 下一首

-(void)myPlayNext {

    if (self.currentIndex < self.musicUrlArray.count - 1) {

        [self.player pause];

        self.currentIndex++;

        [self playerCurrentMusic];

    }

}

/*****************   控制台   *****************/

#pragma mark -- 声明App接收远程控制事件

-(void)viewDidAppear:(BOOL)animated {

    [super viewDidAppear:animated];

    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

    [self becomeFirstResponder];

}

#pragma mark -- App结束声明接收远程控制事件

- (void) viewWillDisappear:(BOOL)animated {

    [super viewWillDisappear:animated];

    [[UIApplication sharedApplication] endReceivingRemoteControlEvents];

    [self resignFirstResponder];

}

#pragma mark -- 接受控制台的控制事件

- (void)remoteControlReceivedWithEvent: (UIEvent *) receivedEvent {

    if (receivedEvent.type == UIEventTypeRemoteControl) {

        //判断点击按钮的类型

        switch (receivedEvent.subtype) {

            case UIEventSubtypeRemoteControlPlay:

                [self.player play];  //播放

                break;

            case UIEventSubtypeRemoteControlPause:

                [self.player pause]; //暂停

                break;

            case UIEventSubtypeRemoteControlPreviousTrack:

                [self myPlayFormer]; //播放上一首

                break;

            case UIEventSubtypeRemoteControlNextTrack:

                [self myPlayNext];  //播放下一首

                break;

            default:

                break;

        }

    }

}

#pragma mark 实现后台播放完一首后, 继续播放下一首

- (BOOL)canBecomeFirstResponder {

    return YES;

}

/*****************   AVAudioPlayer 代理   *****************/

#pragma mark -- 后台播放被打断, 继续恢复播放 (比如打电话...)

- (void)audioPlayerEndInterruption:(AVAudioPlayer *)player withOptions:(NSUInteger)flags {

    [self.player play];

}

#pragma mark -- 播放完当前声音后,播放下一首

-(void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag {

    if (self.currentIndex < self.musicUrlArray.count - 1) {

        self.currentIndex++;

        [self playerCurrentMusic];

    }

}

#pragma mark -- 滑块滑动改变播放进度(代理方法)

-(void)changValue:(UISlider *)slider {

    //拖动滑块时, 停止计时器

    [self.timer invalidate];

    self.player.currentTime = slider.value;

    //开始计时器

    self.timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(reloadAction) userInfo:nil repeats:YES];

}

想要实现后台播放（即程序进入后台，音乐继续播放）需要修改plist文件:

1.添加required background modes这个key项，并选择"App plays audio or streams audio/video using AirPlay"这个value项。

2.XCode7.1以上获取网络数据,需要修改plist文件

在Info.plist中添加App Transport Security Settings类型Dictionary。

在App Transport Security Settings下添加Allow Arbitrary Loads类型Boolean,值设为YES

需要在后台实现播放页的各种上一首,下一首...各种功能, 还需要在Appdelegate.m的background方法里:

- (void)applicationDidEnterBackground:(UIApplication *)application {

    //程序进入后台后, 为了让音乐继续播放, 在此方法里创建该代理播放页, 并指定它播放器的代理

    PlayViewController *player = [PlayViewController defaultPlayVC];

    player.player.delegate = player;

}

当前工程Demo地址: http://download.csdn.net/detail/margaret_mo/9412069

巴特西

AVAudioPlayer播放并实现了后台播放和远程控制

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