#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
@interface ViewController ()
{
AVPlayer *player;
AVPlayerItem *playerItem;
UIProgressView * progressView;
UISlider *_slider;
//推断slider是否按下，
BOOL isOpen;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self createUI];
//进行初始化创建
NSURL *url = [NSURL fileURLWithPath:@"/Users/qianfeng01/Downloads/千锋Swift视频教程-1.Swift语言介绍.mp4"];
playerItem = [[AVPlayerItem alloc]initWithURL:url];
//创建player
player = [[AVPlayer alloc]initWithPlayerItem:playerItem];
//生成layer层
AVPlayerLayer *layer = [AVPlayerLayer playerLayerWithPlayer:player];
//设置坐标
layer.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
//把layer层假如到self.view.layer中
[self.view.layer addSublayer:layer];
//进行播放
[player play];
/**以上是主要的播放界面。可是没有前进后退**/
//观察是否播放，KVO进行观察，观察playerItem.status
[playerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];
//观察缓存如今的进度，KVO进行观察，观察loadedTimeRanges
[playerItem addObserver:self forKeyPath:@"loadedTimeRanges" options:NSKeyValueObservingOptionNew context:nil];
}
//观察是否播放
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
if ([keyPath isEqualToString:@"status"]) {
if (playerItem.status == AVPlayerStatusReadyToPlay) {
NSLog(@"開始播放");
//须要開始获取数据，包含播放的总时长。播放的缓存，播放的当时时间
[self loadData];
}else{
NSLog(@"播放失败");
}
}else{
//kvo触发的另外一个属性
NSArray *array = [playerItem loadedTimeRanges];
//获取范围i
CMTimeRange range = [array.firstObject CMTimeRangeValue];
//从哪儿開始的
CGFloat start = CMTimeGetSeconds(range.start);
//缓存了多少
CGFloat duration = CMTimeGetSeconds(range.duration);
//一共缓存了多少
CGFloat allCache = start+duration;
NSLog(@"缓存了多少数据：%f",allCache);
//设置缓存的百分比
CMTime allTime = [playerItem duration];
//转换
CGFloat time = CMTimeGetSeconds(allTime);
CGFloat y = allCache/time;
NSLog(@"缓存百分比：--------%f",y);
progressView.progress = y;
}
}
#pragma mark -- 获取播放数据
- (void)loadData{
__weak AVPlayerItem *xx = playerItem;
__weak UISlider *cc = _slider;
//第一个參数是每隔多长时间调用一次。在这里设置的是每隔1秒调用一次
[player addPeriodicTimeObserverForInterval:CMTimeMake(1, 1) queue:NULL usingBlock:^(CMTime time) {
//当前播放时间
CGFloat current = xx.currentTime.value/xx.currentTime.timescale;
//获取总时长
CMTime time1 = xx.duration;
float x = CMTimeGetSeconds(time1);
NSLog(@"当前播放的秒数------- %f --------%f",current,x);
//设置滑动条进度
float v = current/x;
//推断slider是否按下，按下去就先别赋值
if (!isOpen) {
cc.value = v;
}
}];
}
#pragma mark --- 创建UI
- (void)createUI{
progressView = [[UIProgressView alloc]initWithProgressViewStyle:UIProgressViewStyleBar];
progressView.frame = CGRectMake(0, 460, self.view.frame.size.width, 20);
[self.view addSubview:progressView];
_slider = [[UISlider alloc]initWithFrame:CGRectMake(0, 480, self.view.frame.size.width, 20)];
[self.view addSubview:_slider];
//加入点击事件
[_slider addTarget:self action:@selector(sliderClick:) forControlEvents:UIControlEventTouchUpInside];
//抬起来的事件
[_slider addTarget:self action:@selector(sliderClickUp:) forControlEvents:UIControlEventTouchUpInside];
}
//加入点击事件
- (void)sliderClick:(UISlider *)slider{
NSLog(@"加入点击事件");
isOpen = YES;
}
//抬起来的事件
- (void)sliderClickUp:(UISlider *)slider{
NSLog(@"抬起来的事件");
isOpen = NO;
//从这里開始播放
CGFloat g = slider.value;
//获取总时长
CMTime time1 = playerItem.duration;
float x = CMTimeGetSeconds(time1);
//进行播放
[player seekToTime:CMTimeMake(x * g,1)];
//播放
[player play];
}
@end