ios音频播放，回调播放结束与开始

音频播放使用的是AVFoundation框架的AVPlayer，使用通知监听播放结束，使用系统的addPeriodicTimeObserverForInterval监听播放进度，当播放进度开始时开始回调，主要是解决监听播放开始不准确的问题，在使用结束时调用dm_removeNoticAndObsever方法，把通知和kvo清除

代码如下

//

//  DM_SoundManager.h

//  Video2

//

//  Created by 魏友臣 on 2019/1/21.

//  Copyright © 2019 魏友臣. All rights reserved.

//

#import

#import

@class DM_SoundManager;

@protocolDM_SoundManagerDelagete

/**

 播放结束

 */

- (void)dm_soundManagerDidEnd:(DM_SoundManager*)DM_SoundManager;

/**

 播放进度 0.1s

 */

- (void)dm_soundManager:(DM_SoundManager*)DM_SoundManager plyerProgress:(double)progress;

@end

@interfaceDM_SoundManager :NSObject

@property(nonatomic,weak)iddelegate;

-(instancetype)initWithUrl:(NSURL*)url delegate:(id)delegate;

- (void)dm_removeNoticAndObsever;

@end

//

//  DM_SoundManager.m

//  Video2

//

//  Created by 魏友臣 on 2019/1/21.

//  Copyright © 2019 魏友臣. All rights reserved.

//

#import "DM_SoundManager.h"

@implementationDM_SoundManager

{

    AVPlayer*_soundPlay;

    id_timeObserver;

    BOOLisClear;

}

-(instancetype)initWithUrl:(NSURL*)url delegate:(id)delegate{

    if(self= [superinit]) {

        [selfsetPlayerUrl:urldelegate:delegate];

    }

    return self;

}

- (void)setPlayerUrl:(NSURL*)url delegate:(id)delegate{

    self.delegate= delegate;

    _soundPlay = [[AVPlayer alloc]initWithURL:url];

    [_soundPlay play];

    isClear=NO;

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playbackFinished) name:AVPlayerItemDidPlayToEndTimeNotification object:_soundPlay.currentItem];

    __weak typeof(self)ws = self;

    _timeObserver = [_soundPlay addPeriodicTimeObserverForInterval:CMTimeMake(1,10) queue:dispatch_get_main_queue() usingBlock:^(CMTime time) {

        doublesec =CMTimeGetSeconds(time);

        if(sec>0) {

            if(ws.delegate&&@selector(dm_soundManager:plyerProgress:)) {

                [ws.delegate dm_soundManager:ws plyerProgress:sec];

            }

        }

    }];

}

- (void)playbackFinished

{

    if(self.delegate&&@selector(dm_soundManagerDidEnd:)) {

        [self.delegate dm_soundManagerDidEnd:self];

    }

}

- (void)dm_removeNoticAndObsever

{

    if(isClear==NO) {

        [[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemDidPlayToEndTimeNotification object:nil];

        [_soundPlay removeTimeObserver:_timeObserver];

        [_soundPlaypause];

        isClear=YES;

    }

}

@end