序言
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功能其实看着挺简单，实现过程也踩了不少坑。一方面记录一下；另一方面也算是对实现过程的再一次梳理，这样大家看代码也会比较明白。
效果
我们先看看我实现的效果
实现
实现过程分析
整个功能可以分为三部分：
这部分我们单独封装一个视频播放器即可
这部分实现过程比较复杂，一共分成了4部分。灰色遮盖、左右把手滑块、滑块中间上下两条线、图片管理视图
控制器视图逻辑组装和功能实现
这里使用AVPlayer、playerLayer、AVPlayerItem这三个类实现了视频播放功能；由于整个事件都是基于KVO监听的，所以增加了Block代码提供了对外监听使用。
#import "FOFMoviePlayer.h"
@interface FOFMoviePlayer()
{
AVPlayerLooper *_playerLooper;
AVPlayerItem *_playItem;
BOOL _loop;
}
@property(nonatomic,strong)NSURL *url;
@property(nonatomic,strong)AVPlayer *player;
@property(nonatomic,strong)AVPlayerLayer *playerLayer;
@property(nonatomic,strong)AVPlayerItem *playItem;
@property (nonatomic,assign) CMTime duration;
@end
@implementation FOFMoviePlayer
-(instancetype)initWithFrame:(CGRect)frame url:(NSURL *)url superLayer:(CALayer *)superLayer{
self = [super init];
if (self) {
[self initplayers:superLayer];
_playerLayer.frame = frame;
self.url = url;
}
return self;
}
-(instancetype)initWithFrame:(CGRect)frame url:(NSURL *)url superLayer:(CALayer *)superLayer loop:(BOOL)loop{
self = [self initWithFrame:frame url:url superLayer:superLayer];
if (self) {
_loop = loop;
}
return self;
}
- (void)initplayers:(CALayer *)superLayer{
self.player = [[AVPlayer alloc] init];
self.playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player];
self.playerLayer.videoGravity = AVLayerVideoGravityResize;
[superLayer addSublayer:self.playerLayer];
}
- (void)initLoopPlayers:(CALayer *)superLayer{
self.player = [[AVQueuePlayer alloc] init];
self.playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player];
self.playerLayer.videoGravity = AVLayerVideoGravityResize;
[superLayer addSublayer:self.playerLayer];
}
-(void)fof_play{
[self.player play];
}
-(void)fof_pause{
[self.player pause];
}
#pragma mark - Observe
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary*)change context:(void *)context{
if ([keyPath isEqualToString:@"status"]) {
AVPlayerItem *item = (AVPlayerItem *)object;
AVPlayerItemStatus status = [[change objectForKey:@"new"] intValue]; // 获取更改后的状态
if (status == AVPlayerItemStatusReadyToPlay) {
_duration = item.duration;//只有在此状态下才能获取，不能在AVPlayerItem初始化后马上获取
NSLog(@"准备播放");
if (self.blockStatusReadyPlay) {
self.blockStatusReadyPlay(item);
}
} else if (status == AVPlayerItemStatusFailed) {
if (self.blockStatusFailed) {
self.blockStatusFailed();
}
AVPlayerItem *item = (AVPlayerItem *)object;
NSLog(@"%@",item.error);
NSLog(@"AVPlayerStatusFailed");
} else {
self.blockStatusUnknown();
NSLog(@"%@",item.error);
NSLog(@"AVPlayerStatusUnknown");
}
}else if ([keyPath isEqualToString:@"tracking"]){
NSInteger status = [change[@"new"] integerValue];
if (self.blockTracking) {
self.blockTracking(status);
}
if (status) {//正在拖动
[self.player pause];
}else{//停止拖动
}
}else if ([keyPath isEqualToString:@"loadedTimeRanges"]){
NSArray *array = _playItem.loadedTimeRanges;
CMTimeRange timeRange = [array.firstObject CMTimeRangeValue];//本次缓冲时间范围
CGFloat startSeconds = CMTimeGetSeconds(timeRange.start);
CGFloat durationSeconds = CMTimeGetSeconds(timeRange.duration);
NSTimeInterval totalBuffer = startSeconds + durationSeconds;//缓冲总长度
double progress = totalBuffer/CMTimeGetSeconds(_duration);
if (self.blockLoadedTimeRanges) {
self.blockLoadedTimeRanges(progress);
}
NSLog(@"当前缓冲时间：%f",totalBuffer);
}else if ([keyPath isEqualToString:@"playbackBufferEmpty"]){
NSLog(@"缓存不够，不能播放！");
}else if ([keyPath isEqualToString:@"playbackLikelyToKeepUp"]){
if (self.blockPlaybackLikelyToKeepUp) {
self.blockPlaybackLikelyToKeepUp([change[@"new"] boolValue]);
}
}
}
-(void)setUrl:(NSURL *)url{
_url = url;
[self.player replaceCurrentItemWithPlayerItem:self.playItem];
}
-(AVPlayerItem *)playItem{
_playItem = [[AVPlayerItem alloc] initWithURL:_url];
//监听播放器的状态，准备好播放、失败、未知错误
[_playItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];
// 监听缓存的时间
[_playItem addObserver:self forKeyPath:@"loadedTimeRanges" options:NSKeyValueObservingOptionNew context:nil];
// 监听获取当缓存不够，视频加载不出来的情况：
[_playItem addObserver:self forKeyPath:@"playbackBufferEmpty" options:NSKeyValueObservingOptionNew context:nil];
// 用于监听缓存足够播放的状态
[_playItem addObserver:self forKeyPath:@"playbackLikelyToKeepUp" options:NSKeyValueObservingOptionNew context:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(private_playerMovieFinish) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];
return _playItem;
}
- (void)private_playerMovieFinish{
NSLog(@"播放结束");
if (self.blockPlayToEndTime) {
self.blockPlayToEndTime();
}
if (_loop) {//默认提供一个循环播放的功能
[self.player pause];
CMTime time = CMTimeMake(1, 1);
__weak typeof(self)this = self;
[self.player seekToTime:time completionHandler:^(BOOL finished) {
[this.player play];
}];
}
}
-(void)dealloc{
NSLog(@"-----销毁-----");
}
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