IOS开发之AVPlayer | 易学教程

// ViewController.m

// 03-AVPlayer

// Created by 鹿微微鹿 on 16/5/6.

//AVPlayer

#import "ViewController.h"

#import <AVFoundation/AVFoundation.h>

@interface ViewController (){

//播放器

AVPlayer *_player;

}

@property (weak, nonatomic) IBOutlet UISlider *sliderProgress;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

//1.创建播放源对象

NSString *path = [[NSBundle mainBundle]pathForResource:@"MovieTest.mp4" ofType:nil];

AVPlayerItem *playerItem = [[AVPlayerItem alloc]initWithURL:[NSURL fileURLWithPath:path]];

//2.创建播放器对象

_player = [[AVPlayer alloc]initWithPlayerItem:playerItem];

//3.播放

[_player play];

//4.暂停

//[_player pause];

//5.自动检测播放进度

//参数1:间隔时间

//参数2:block执行的队列

//参数3:每隔参数1调用的block在这个block中可以获取当前帧数和播放速度

//在block中警告的解决方法

__weak AVPlayer *tplayer =_player;

__weak UISlider *tslider = _sliderProgress;

[_player addPeriodicTimeObserverForInterval:CMTimeMake(1,10)

queue:dispatch_get_main_queue() usingBlock:^(CMTime time) {

//拿到总的帧数

CMTime totalTime = tplayer.currentItem.duration;

//总的时间

float total = totalTime.value * 1.0f / totalTime.timescale;

//当前时间

float current = time.value*1.0f/time.timescale;

//设置进度条

tslider.value = current /total;

}];

//设置音量

_player.volume = 0.5;

//设置播放速度范围是0.5-2.0默认是1

_player.rate = 1.0;

//使用消息中心区检测播放结束的时刻

//AVPlayerItemDidPlayToEndTimeNotification

[[NSNotificationCenter defaultCenter]

addObserver:self selector:@selector(endPlay) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];

//9.切换播放源

// [_player replaceCurrentItemWithPlayerItem:nil];

}

#pragma mark - 消息中心

- (void)endPlay{

NSLog(@"结束播放");

self.sliderProgress.value = 0;

NSString *path = [[NSBundle mainBundle]

pathForResource:@"亡灵序曲.mp3" ofType:nil];

AVPlayerItem *item = [[AVPlayerItem alloc]

initWithURL:[NSURL fileURLWithPath:path]];

//1.切换到下一首歌曲

[_player replaceCurrentItemWithPlayerItem:item];

//切换后要手动播放

[_player play];

}

#pragma mark - 按钮点击

//播放

- (IBAction)plsy:(id)sender {

[_player play];

}

//暂停

- (IBAction)pause:(id)sender {

[_player pause];

}

#pragma mark - 拖动进度条的时候音乐进度改变

- (IBAction)sliderChangeValue:(UISlider *)sender {

//CMTime是一个结构体

//value 媒体文件总的帧数

//timeScale 每一秒播放的帧数

//时间 = value / timeScale

//定位到第二秒

//[_player seekToTime:CMTimeMake(2,1)];

//定位到第十秒

//[_player seekToTime:CMTimeMake(10,1)];

//根据进度进行定位

//总时间 = 总的帧数/播放速度

//slider的进度的位置:(总的帧数*slider.value)/播放速度

//1.获取当前播放媒体总的帧数

//a.获取播放源

AVPlayerItem *current = _player.currentItem;

//b.获取到总帧数

//总帧数

CMTimeValue total = current.duration.value;

//播放速度

CMTimeScale speed = current.duration.timescale;

//设置进度

[_player seekToTime:CMTimeMake(total * sender.value,speed )];

}

#pragma mark - 步进器改变速度

- (IBAction)changeSpeed:(UIStepper *)sender {

_player.rate = sender.value;

}

@end

来源：oschina

链接：https://my.oschina.net/u/2683146/blog/671218

标签

avplayer