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。
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];
第二种方式:
//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。。。。。。
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];
第二:给播放器加监听以及屏幕旋转的通知
// 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 *)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 resourcesfor playback.
// 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;
这是JD的加载动画View以及重写的MJHeader文件
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;
}
}
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