更新UISlider值视频播放器

Question

我正在使用VIMVideoPlayer播放视频，我正在尝试更新UISlider的值，以便它反映播放器的当前时间。但是，这根本不会更新该值。

UISlider的最小值为0，最大值为1，当前值为0.

委托方法是：

-(void) videoPlayerView:(VIMVideoPlayerView *)videoPlayerView didFailWithError:(NSError *)error {

}

-(void) videoPlayerViewDidReachEnd:(VIMVideoPlayerView *)videoPlayerView {
    [self.playerSlider setValue:0.0 animated:YES];
}

-(void) videoPlayerViewIsReadyToPlayVideo:(VIMVideoPlayerView *)videoPlayerView {

}
- (void)videoPlayerView:(VIMVideoPlayerView *)videoPlayerView timeDidChange:(CMTime)cmTime {

    float time = CMTimeGetSeconds(videoPlayerView.player.player.currentTime);
    float dur = CMTimeGetSeconds(videoPlayerView.player.player.currentItem.duration);
    float progress = time/dur;
    NSLog(@"here : %f", progress);
    if (progress > 0.0) {
        [self.playerSlider setValue:progress animated:YES];
    }

}

- (void)videoPlayerView:(VIMVideoPlayerView *)videoPlayerView loadedTimeRangeDidChange:(float)duration {

}