addPeriodicTimeObserverForInterval称为额外时间 [英] addPeriodicTimeObserverForInterval called extra time

问题描述

我有一个AVPlayer，具有4秒的视频(NSTimeInterval duration = CMTimeGetSeconds(self.playerItem.asset.duration) = 4).

I have a AVPlayer with 4 sec video (NSTimeInterval duration = CMTimeGetSeconds(self.playerItem.asset.duration) = 4).

我想通过更改来更新用户界面:

I'd like to update UI with changes:

self.periodicTimeObserver = [self.player addPeriodicTimeObserverForInterval:CMTimeMake(1, 1) queue:dispatch_get_main_queue() usingBlock:^(CMTime time) {

    [weakSelf currentTimeDidChange:CMTimeGetSeconds(time)];

}];

但是由于某些原因，我得到了更多的UI调用:

But for some reasons I get extra calls to UI:

- (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

感谢您的帮助

推荐答案

您需要确保您没有多次调用periodTimeObserver，因此请编写此代码

you need to be sure that you are not calling periodicTimeObserver many time so do this write this code

if (self.periodicTimeObserver == nil){
self.periodicTimeObserver = [self.player addPeriodicTimeObserverForInterval:CMTimeMake(1, 1) queue:dispatch_get_main_queue() usingBlock:^(CMTime time) {

    [weakSelf currentTimeDidChange:CMTimeGetSeconds(time)];

}];
}

然后，在您的视频播放完毕后，立即移除观察者

then as soon as your video is finishes playing remove observer

[player removeTimeObserver:self.periodicTimeObserver];
self.periodicTimeObserver = nil;

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