遇到个需求需要涉及到视频播放,那么没办法,先找资料开始进一步了解下这个不熟悉的东西.一个是MP,一个
是AV,MP是封装好的,用起来非常简单,但是自定义样式就基本不可能了。AVPlayer存在于AVFundation中,更接近
于底层,所以灵活性更强大,废话不多说,咱们先简单写个Demo看下他的工作原理,然后模仿网易新闻写个界面出
来,这里用到了一个封装的框架,如果不熟悉内部原理的同学可以先看看我写的第一个Demo,基本所有逻辑都有。
这里容我啰嗦一句:
开发中,单纯的使用AVPlayer类是无法播放视频的,需要将视频层添加到AVPLayerLayer层,这样视频才能显示出
来,Layer的定义方式有两种,一种是下面这种直接使用PlayerLayer,还有一个就是自己做一个View,然后把他自身的Layer改成playerLayer
第一种方式:
self.playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player]; self.playerLayer.videoGravity = AVLayerVideoGravityResizeAspect; self.playerLayer.frame = self.view.bounds; [self.view.layer addSublayer:self.playerLayer];
//修改当前view的 layer的 class +(Class)layerClass { //AVPlayerLayer return [AVPlayerLayer class]; }
只能上传2M的东东,这视频一帧一帧消耗太快了,都不敢多录了,各位大爷将就着看吧。。。。。。
不要来打我,不然我让我表哥打死你
先简单介绍下AVPlayer的用法
很多朋友应该和我一样,一开始接触视频的时候都不知道用什么东东来写,如果是大神
就直接下载Demo吧。小白来介绍下,我也第一次用
第一:初始化播放器
// 初始化播放器item self.playerItem = [[AVPlayerItem alloc] initWithURL:[NSURL URLWithString:@"http://flv2.bn.netease.com/videolib3/1608/30/zPuaL7429/SD/zPuaL7429-mobile.mp4"]]; self.player = [[AVPlayer alloc] initWithPlayerItem:self.playerItem]; // 初始化播放器的Layer self.playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player]; // layer的frame self.playerLayer.frame = self.backView.bounds; // layer的填充属性 和UIImageView的填充属性类似 // AVLayerVideoGravityResizeAspect 等比例拉伸,会留白 // AVLayerVideoGravityResizeAspectFill // 等比例拉伸,会裁剪 // AVLayerVideoGravityResize // 保持原有大小拉伸 self.playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill; // 把Layer加到底部View上 [self.backView.layer insertSublayer:self.playerLayer atIndex:0];
// 监听播放器状态变化 [self.playerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil]; // 监听缓存进去,就是大家所看到的一开始进去底部灰色的View会迅速加载 [self.playerItem addObserver:self forKeyPath:@"loadedTimeRanges" options:NSKeyValueObservingOptionNew context:nil]; //旋转屏幕通知 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onDeviceOrientationChange) name:UIDeviceOrientationDidChangeNotification object:nil ];
// 监听播放器的变化属性 - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context { if ([keyPath isEqualToString:@"status"]) { AVPlayerItemStatus statues = [change[NSKeyValueChangeNewKey] integerValue]; switch (statues) { // 监听到这个属性的时候,理论上视频就可以进行播放了 case AVPlayerItemStatusReadyToPlay: // 最大值直接用sec,以前都是 // CMTimeMake(帧数(slider.value * timeScale), 帧/sec) self.slider.maximumValue = CMTimeGetSeconds(self.playerItem.duration); [self initTimer]; // 启动定时器 5秒自动隐藏 if (!self.autoDismissTimer) { self.autoDismissTimer = [NSTimer timerWithTimeInterval:8.0 target:self selector:@selector(autoDismissView:) userInfo:nil repeats:YES]; [[NSRunLoop currentRunLoop] addTimer:self.autoDismissTimer forMode:NSDefaultRunLoopMode]; } break; case AVPlayerItemStatusUnknown: break; // 这个就是不能播放喽,加载失败了 case AVPlayerItemStatusFailed: // 这时可以通过`self.player.error.description`属性来找出具体的原因 break; default: break; } } else if ([keyPath isEqualToString:@"loadedTimeRanges"]) // 监听缓存进度的属性 { // 计算缓存进度 NSTimeInterval timeInterval = [self availableDuration]; // 获取总长度 CMTime duration = self.playerItem.duration; CGFloat durationTime = CMTimeGetSeconds(duration); // 监听到了给进度条赋值 [self.progressView setProgress:timeInterval / durationTime animated:NO]; } }
AVPlayerItemStatusReadyToPlay
AVPlayerItemStatusFailed
这两个属性还比较好理解,是个人都知道,但是这个是什么鬼
AVPlayerItemStatusUnknown
内部是这么解释的
Indicates that the status of the player item is not yet known because it has not tried to load new media resources
for playback.
fk u 我英语不好,看不懂啊,估计是playerItem这个视频资源对象挂了,识别不了,暂时不知道怎么处理
来个官方的说话,显得我比较牛B
// 调用plaer的对象进行UI更新 - (void)initTimer { // player的定时器 __weak typeof(self)weakSelf = self; // 每秒更新一次UI Slider [self.player addPeriodicTimeObserverForInterval:CMTimeMake(1, 1) queue:dispatch_get_main_queue() usingBlock:^(CMTime time) { // 当前时间 CGFloat nowTime = CMTimeGetSeconds(weakSelf.playerItem.currentTime); // 总时间 CGFloat duration = CMTimeGetSeconds(weakSelf.playerItem.duration); // sec 转换成时间点 weakSelf.nowLabel.text = [weakSelf convertToTime:nowTime]; weakSelf.remainLabel.text = [weakSelf convertToTime:(duration - nowTime)]; // 不是拖拽中的话更新UI if (!weakSelf.isDragSlider) { weakSelf.slider.value = CMTimeGetSeconds(weakSelf.playerItem.currentTime); } }]; }
// sec 转换成指定的格式 - (NSString *)convertToTime:(CGFloat)time { // 初始化格式对象 NSDateFormatter *fotmmatter = [[NSDateFormatter alloc] init]; // 根据是否大于1H,进行格式赋值 if (time >= 3600) { [fotmmatter setDateFormat:@"HH:mm:ss"]; } else { [fotmmatter setDateFormat:@"mm:ss"]; } // 秒数转换成NSDate类型 NSDate *date = [NSDate dateWithTimeIntervalSince1970:time]; // date转字符串 return [fotmmatter stringFromDate:date]; }
// 启动定时器 5秒自动隐藏 // 咱们这种初始化定时器的方式需要自己手动加到runloop上 // scheduledTimerWithTimeInterval用这个的时候就不需要手动加到runloop中 if (!self.autoDismissTimer) { self.autoDismissTimer = [NSTimer timerWithTimeInterval:8.0 target:self selector:@selector(autoDismissView:) userInfo:nil repeats:YES]; [[NSRunLoop currentRunLoop] addTimer:self.autoDismissTimer forMode:NSDefaultRunLoopMode]; }
#pragma mark - 自动隐藏bottom和top - (void)autoDismissView:(NSTimer *)timer { // player的属性rate /* indicates the current rate of playback; 0.0 means "stopped", 1.0 means "play at the natural rate of the current item" */ if (self.player.rate == 0) { // 暂停状态就不隐藏 } else if (self.player.rate == 1) { if (self.bottomView.alpha == 1) { [UIView animateWithDuration:1.0 animations:^{ self.bottomView.alpha = 0; self.topView.alpha = 0; }]; } } }
其实切换的时候就是把只之前的Layer移除,然后重新布局,加到KeyWindow中去
// 全屏显示 -(void)toFullScreenWithInterfaceOrientation:(UIInterfaceOrientation )interfaceOrientation{ // 先移除之前的 [self.backView removeFromSuperview]; // 初始化 self.backView.transform = CGAffineTransformIdentity; if (interfaceOrientation==UIInterfaceOrientationLandscapeLeft) { self.backView.transform = CGAffineTransformMakeRotation(-M_PI_2); }else if(interfaceOrientation==UIInterfaceOrientationLandscapeRight){ self.backView.transform = CGAffineTransformMakeRotation(M_PI_2); } // BackView的frame能全屏 self.backView.frame = CGRectMake(0, 0, kScreenWidth, kScreenHeight); // layer的方向宽和高对调 self.playerLayer.frame = CGRectMake(0, 0, kScreenHeight, kScreenWidth); // remark 约束 [self.bottomView mas_remakeConstraints:^(MASConstraintMaker *make) { make.height.mas_equalTo(50); make.top.mas_equalTo(kScreenWidth-50); make.left.equalTo(self.backView).with.offset(0); make.width.mas_equalTo(kScreenHeight); }]; [self.topView mas_remakeConstraints:^(MASConstraintMaker *make) { make.height.mas_equalTo(50); make.left.equalTo(self.backView).with.offset(0); make.width.mas_equalTo(kScreenHeight); }]; [self.closeButton mas_remakeConstraints:^(MASConstraintMaker *make) { make.left.equalTo(self.backView).with.offset(5); make.height.mas_equalTo(30); make.width.mas_equalTo(30); make.top.equalTo(self.backView).with.offset(10); }]; [self.titleLabel mas_remakeConstraints:^(MASConstraintMaker *make) { make.left.equalTo(self.topView).with.offset(45); make.right.equalTo(self.topView).with.offset(-45); make.center.equalTo(self.topView); make.top.equalTo(self.topView).with.offset(0); }]; [self.nowLabel mas_remakeConstraints:^(MASConstraintMaker *make) { make.left.equalTo(self.slider.mas_left).with.offset(0); make.top.equalTo(self.slider.mas_bottom).with.offset(0); make.size.mas_equalTo(CGSizeMake(100, 20)); }]; [self.remainLabel mas_remakeConstraints:^(MASConstraintMaker *make) { make.right.equalTo(self.slider.mas_right).with.offset(0); make.top.equalTo(self.slider.mas_bottom).with.offset(0); make.size.mas_equalTo(CGSizeMake(100, 20)); }]; // 加到window上面 [[UIApplication sharedApplication].keyWindow addSubview:self.backView]; } // 缩小到cell -(void)toCell{ // 先移除 [self.backView removeFromSuperview]; __weak typeof(self)weakSelf = self; [UIView animateWithDuration:0.5f animations:^{ weakSelf.backView.transform = CGAffineTransformIdentity; weakSelf.backView.frame = CGRectMake(0, 80, kScreenWidth, kScreenHeight / 2.5); weakSelf.playerLayer.frame = weakSelf.backView.bounds; // 再添加到View上 [weakSelf.view addSubview:weakSelf.backView]; // remark约束 [self.bottomView mas_remakeConstraints:^(MASConstraintMaker *make) { make.left.equalTo(weakSelf.backView).with.offset(0); make.right.equalTo(weakSelf.backView).with.offset(0); make.height.mas_equalTo(50); make.bottom.equalTo(weakSelf.backView).with.offset(0); }]; [self.topView mas_remakeConstraints:^(MASConstraintMaker *make) { make.left.equalTo(weakSelf.backView).with.offset(0); make.right.equalTo(weakSelf.backView).with.offset(0); make.height.mas_equalTo(50); make.top.equalTo(weakSelf.backView).with.offset(0); }]; [self.closeButton mas_makeConstraints:^(MASConstraintMaker *make) { make.left.equalTo(weakSelf.backView).with.offset(5); make.centerY.equalTo(weakSelf.topView); make.size.mas_equalTo(CGSizeMake(30, 30)); }]; }completion:^(BOOL finished) { }]; }
下面咱们试着写个网易播放视频的Demo,在tableView中使用下,效果图已经在最上面了
这里无非多了几个属性
@property (nonatomic,strong) NSIndexPath *currentIndexPath; // 当前播放的cell
@property (nonatomic,assign) BOOL isSmallScreen; // 是否放置在window上
@property(nonatomic,strong) ViedoTableViewCell *currentCell; // 当前cell
分析1:全屏小屏切换的时候回到指定的cell,那么先点击播放记录位置
1.第一种cell播放:Layer是加载到cell上的背景图片区域的 滚动的时候要记录当前cell
2.第二种全屏播放:Layer是加载到Window上的 frame全屏
3.第三种小窗播放:它其实就是全屏播放的一个特例,也是加载到Window上的,frame自定义
其实不同状态的切换无非就是Layer所在View的位置不停切换
下面这个方法就是记录当前播放的cell下标
#pragma mark - 播放器播放 - (void)startPlayVideo:(UIButton *)sender { // 获取当前的indexpath self.currentIndexPath = [NSIndexPath indexPathForRow:sender.tag inSection:0]; // iOS 7 和 8 以上获取cell的方式不同 if ([UIDevice currentDevice].systemVersion.floatValue>=8||[UIDevice currentDevice].systemVersion.floatValue<7) { self.currentCell = (ViedoTableViewCell *)sender.superview.superview; }else{//ios7系统 UITableViewCell上多了一个层级UITableViewCellScrollView self.currentCell = (ViedoTableViewCell *)sender.superview.superview.subviews; } ViedoModel *model = [self.viedoLists objectAtIndex:sender.tag]; // 小窗口的时候点击播放另一个 先移除掉 if (self.isSmallScreen) { [self releaseWMPlayer]; self.isSmallScreen = NO; } // 当有上一个在播放的时候 点击 就先release if (self.wmPlayer) { [self releaseWMPlayer]; self.wmPlayer = [[WMPlayer alloc]initWithFrame:self.currentCell.mainImageView.bounds]; self.wmPlayer.delegate = self; self.wmPlayer.closeBtnStyle = CloseBtnStyleClose; self.wmPlayer.URLString = model.mp4URL; self.wmPlayer.titleLabel.text = model.title; // [wmPlayer play]; }else{ // 当没有一个在播放的时候 self.wmPlayer = [[WMPlayer alloc]initWithFrame:self.currentCell.mainImageView.bounds]; self.wmPlayer.delegate = self; self.wmPlayer.closeBtnStyle = CloseBtnStyleClose; self.wmPlayer.titleLabel.text = model.title; self.wmPlayer.URLString = model.mp4URL; } // 把播放器加到当前cell的imageView上面 [self.currentCell.mainImageView addSubview:self.wmPlayer]; [self.currentCell.mainImageView bringSubviewToFront:self.wmPlayer]; [self.currentCell.playButton.superview sendSubviewToBack:self.currentCell.playButton]; [self.tableView reloadData]; }
分析2:上下滚动的时候根据坐标切换cell显示还是小窗显示
#pragma mark scrollView delegate - (void)scrollViewDidScroll:(UIScrollView *)scrollView { if(scrollView ==self.tableView){ if (self.wmPlayer==nil) { return; } if (self.wmPlayer.superview) { // 当前cell在tableView中的frame // (lldb) po rectInTableView // (origin = (x = 0, y = 0), size = (width = 375, height = 300)) CGRect rectInTableView = [self.tableView rectForRowAtIndexPath:self.currentIndexPath]; // 把当前的frame从tableView转换到屏幕View上面去 // (lldb) po rectInSuperview // (origin = (x = 0, y = 61), size = (width = 375, height = 300)) CGRect rectInSuperview = [self.tableView convertRect:rectInTableView toView:[self.tableView superview]]; NSLog(@"Y轴变化:%lf,currentCell:%lf",rectInSuperview.origin.y,self.currentCell.mainImageView.frame.size.height); // 当网上移出屏幕的时候或者往下移出屏幕的时候,根据逻辑是否加载到小窗上来 if (rectInSuperview.origin.y<-self.currentCell.mainImageView.frame.size.height ||rectInSuperview.origin.y>kScreenHeight-kNavbarHeight-kTabBarHeight) {//往上拖动 // 如果已经小屏幕显示了,就不做任何操作 if ([[UIApplication sharedApplication].keyWindow.subviews containsObject:self.wmPlayer]&&self.isSmallScreen) { self.isSmallScreen = YES; }else{ //放widow上,小屏显示 这里的逻辑和展示到全屏是一样的道理,只是位置和frame自己定义就好了,想放哪就放哪 [self toSmallScreen]; } }else{ // 如果已经在cell里面了,那么就不做任何操作 if ([self.currentCell.mainImageView.subviews containsObject:self.wmPlayer]) { }else{ // 如果进入屏幕,而且未在cell上,那么动画回currentCell [self toCell]; } } } } }
// 滚动的时候小屏幕,放window上显示 -(void)toSmallScreen{ //放widow上 [self.wmPlayer removeFromSuperview]; __weak typeof(self)weakSelf = self; [UIView animateWithDuration:0.5f animations:^{ weakSelf.wmPlayer.transform = CGAffineTransformIdentity; // 设置window上的位置 weakSelf.wmPlayer.frame = CGRectMake(kScreenWidth/2,kScreenHeight-kTabBarHeight + 40 -(kScreenWidth/2)*0.75, kScreenWidth/2, (kScreenWidth/2)*0.75); weakSelf.wmPlayer.playerLayer.frame = weakSelf.wmPlayer.bounds; // 下面就是更新布局的代码,此处省略了,需要的去下载Demo看看
分析3:用MJRefresh做个JD的加载动画(随便做的,大家随便感受下)
MKJRefreshHeader * header = [MKJRefreshHeader headerWithRefreshingTarget:self refreshingAction:@selector(refreshData)]; header.stateLabel.hidden = YES; header.lastUpdatedTimeLabel.hidden = YES; header.mj_h = 80; self.tableView.mj_header = header;
这里简单的写个重写的方法示例,具体需要看的大家去下载Demo
- (void)setState:(MJRefreshState)state { MJRefreshCheckState // 根据状态做事情 // 刷新完毕 if (state == MJRefreshStateIdle) { if (oldState == MJRefreshStateRefreshing) { self.arrowView.transform = CGAffineTransformIdentity; [UIView animateWithDuration:MJRefreshSlowAnimationDuration animations:^{ self.loadingView1.alpha = 0.0; } completion:^(BOOL finished) { // 如果执行完动画发现不是idle状态,就直接返回,进入其他状态 if (self.state != MJRefreshStateIdle) return; self.loadingView1.alpha = 1.0; [self.loadingView1 endRefresing]; self.arrowView.hidden = NO; }]; } else { // 拉倒即将刷新的时候,又往回缩,不进行刷新 [self.loadingView1 endRefresingDown]; self.arrowView.hidden = NO; [UIView animateWithDuration:MJRefreshFastAnimationDuration animations:^{ self.arrowView.transform = CGAffineTransformIdentity; }]; } } else if (state == MJRefreshStatePulling) { // 继续往下拉的时候 [self.loadingView1 refreing]; NSLog(@"连接点"); self.arrowView.hidden = NO; [UIView animateWithDuration:MJRefreshFastAnimationDuration animations:^{ self.arrowView.transform = CGAffineTransformMakeRotation(0.000001 - M_PI); }]; } else if (state == MJRefreshStateRefreshing) { // 刷新 self.loadingView1.alpha = 1.0; // 防止refreshing -> idle的动画完毕动作没有被执行 [self.loadingView1 refreing]; self.arrowView.hidden = YES; } }
篇幅有点多了,感觉没必要什么都写出来,需要的同学去研究下Demo吧,感谢看到这
里的小伙伴,你们都是好人,好人一生平安啊,要不再点个赞???!!!
简单Demo示例地址:点击打开简单Demo链接
类似网易视频播放最终Demo地址:点击打开网易Demo链接
小白写的东东,希望能帮到大家,大神的话可以给点意见,有问题留言哦
iOS开发之AVPlayer的精彩使用--->网易新闻视频播放界面的另类实现
原文:http://blog.csdn.net/deft_mkjing/article/details/52396224