//
//  ViewController.m
//  音乐
//
//  Created by ma c on 16/5/11.
//  Copyright © 2016年 xubaoaichiyu. All rights reserved.
//

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


@interface ViewController ()<AVAudioPlayerDelegate>
//播放本地音乐
@property (nonatomic, strong) AVAudioPlayer * player;

//播放时间的滑块
@property (weak, nonatomic) IBOutlet UISlider *timeSlider;

//定时器
@property (nonatomic, strong) CADisplayLink * link;

@end

@implementation ViewController

#pragma mark - <getters and setters>

- (CADisplayLink *)link{
    
    if (!_link) {
        _link = [CADisplayLink displayLinkWithTarget:self selector:@selector(change)];
    }
    return _link;
}

- (AVAudioPlayer *)player{
    if (!_player) {
        
        NSURL * url = [[NSBundle mainBundle]URLForResource:@"CX" withExtension:@"mp3"];
        
        NSError * error;
        
        //实例化播放
        _player = [[AVAudioPlayer alloc]initWithContentsOfURL:url error:&error];
        
        //设置代理
        _player.delegate = self;
        
        if (error) {
            NSLog(@"初始化失败");
        }else{
            
            //准备开始播放 缓冲数据
            [_player prepareToPlay];
            
            //是否允许快播
            _player.enableRate = YES;
            
            //设置播放次数 -1为无限
            //0:播放一次 1:播放两次 ......
            _player.numberOfLoops = 0;
            
            //slider最大值
            self.timeSlider.maximumValue = _player.duration;
            
        }
    }
    return  _player;
}

#pragma mark - <life cycle>
- (void)viewDidLoad {
    
    [super viewDidLoad];
    
    //iOS9处理中断
    AVAudioSession * session = [AVAudioSession sharedInstance];
    
    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(Interruption:) name:AVAudioSessionInterruptionNotification object:session];
    
}

#pragma mark - <AVAudioPlayerDelegate>

//播放完成
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag{
    
}

//error
- (void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer *)player error:(NSError *)error{
    
}

//iOS8 开始中断
- (void)audioPlayerBeginInterruption:(AVAudioPlayer *)player{
    
}

//iOS8 结束中断
- (void)audioPlayerEndInterruption:(AVAudioPlayer *)player{
    
}

#pragma mark - <event handle>

//改变slider进度的方法
- (void)change{
    
    //获取当前时间 重置播放进度
    self.timeSlider.value = self.player.currentTime;
}

//iOS9中断处理方法
- (void)Interruption:(NSNotification *)noti{
    if (noti.userInfo.allKeys.count == 2) {
        NSLog(@"结束中断");
    }else{
        NSLog(@"开始中断");
    }
}

//播放
- (IBAction)play:(id)sender {
    
    if (![self.player isPlaying]) {
        
        //添加定时器到runloop中
        [self.link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
        
        [self.player play];
    }
    
}

//暂停
- (IBAction)pause:(id)sender {
    
    if ([self.player isPlaying]) {
        [self.player pause];
        
        //暂停link
        [self.link invalidate];
        self.link = nil;
    }
    
}

//停止
- (IBAction)stop:(id)sender {
    
    [self.player stop];
    
    //清空内存
    self.player = nil;
    
    //停止link
    [self.link invalidate];
    self.link = nil;

}

//按下slieder 开始拖拽
- (IBA