addPeriodicTimeObserverForInterval调用额外的时间
我有一个AVPlayer与4秒的video（ NSTimeInterval duration = CMTimeGetSeconds(self.playerItem.asset.duration) = 4）。
我想更新UI的变化：
self.periodicTimeObserver = [self.player addPeriodicTimeObserverForInterval:CMTimeMake(1, 1) queue:dispatch_get_main_queue() usingBlock:^(CMTime time) { [weakSelf currentTimeDidChange:CMTimeGetSeconds(time)]; }];
但由于某些原因，我得到了额外的UI调用：
- (void)currentTimeDidChange:(NSTimeInterval)currentTime { NSLog(@"timePassed %f, total: %f", currentTime, self.duration); }
日志：
2015-07-23 13:47:07.412 timePassed 0.000000, total: 4.000000 2015-07-23 13:47:07.448 timePassed 0.002814, total: 4.000000 2015-07-23 13:47:07.450 timePassed 0.005481, total: 4.000000 2015-07-23 13:47:08.447 timePassed 1.001473, total: 4.000000 2015-07-23 13:47:09.446 timePassed 2.001612, total: 4.000000 2015-07-23 13:47:10.446 timePassed 3.002021, total: 4.000000 2015-07-23 13:47:11.446 timePassed 4.002139, total: 4.000000 2015-07-23 13:47:12.445 timePassed 5.001977, total: 4.000000 2015-07-23 13:47:12.492 timePassed 5.046618, total: 4.000000
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你需要确保你没有多次调用periodicTimeObserver，所以这样写代码
if (self.periodicTimeObserver == nil){ self.periodicTimeObserver = [self.player addPeriodicTimeObserverForInterval:CMTimeMake(1, 1) queue:dispatch_get_main_queue() usingBlock:^(CMTime time) { [weakSelf currentTimeDidChange:CMTimeGetSeconds(time)]; }]; }
那么只要您的video完成播放删除观察员
[player removeTimeObserver:self.periodicTimeObserver]; self.periodicTimeObserver = nil;
我也有不一致的地方。 所以我不是依靠块给出的值，而是依赖于playerItem本身的值：
self.periodicTimeObserver = [self.player addPeriodicTimeObserverForInterval:CMTimeMake(1, 1) queue:nil usingBlock:^(__unused CMTime time) { [weakSelf currentTimeDidChange:CMTimeGetSeconds(self.playerItem.currentTime)]; }];