将UIProgressBar添加到UITableViewCell

Question

在播放音频剪辑时，我需要在UIProgressBar中显示UITableviewCell。

我试着运行一个NSTimer，然后尝试更新进度视图，但它不起作用。这是我的密码。请告诉我这种方法有什么问题。

运行计时器

self.timer = [NSTimer scheduledTimerWithTimeInterval:0.25
                                          target:self
                                        selector:@selector(updatePlayProgress)
                                        userInfo:nil
                                         repeats:YES];

在TableviewCell中更新UIProgressView

- (void)updatePlayProgress {
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];

    NSLog(@"Duration %f", appDelegate.moviePlayer.duration);
    NSLog(@"Current time %f", appDelegate.moviePlayer.currentPlaybackTime);

    float timeLeft = appDelegate.moviePlayer.currentPlaybackTime/appDelegate.moviePlayer.duration;

    // upate the UIProgress
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:playingIndex inSection:0];
    FeedCell *cell = (FeedCell*)[self tableView:self.tblView cellForRowAtIndexPath:indexPath];

    NSLog(@"Time left %f", timeLeft);

    cell.progressPlay.progress = 0.5;

    [cell.progressPlay setNeedsDisplay];
}

CellForRowAtIndexPath

fCell.progressPlay.alpha = 0.5;
fCell.progressPlay.tintColor = navigationBarColor;
[fCell.progressPlay setTransform:CGAffineTransformMakeScale(fCell.frame.size.width, fCell.frame.size.height)];

[fCell.progressPlay setHidden:NO];

return fCell;

输出应该类似于

​

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Answer 1

在将近两天后，终于发现了这个问题:( :(错误在这一行中)

错误

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:playingIndex inSection:0];
FeedCell *cell = (FeedCell*)[self tableView:self.tblView cellForRowAtIndexPath:indexPath];

校正

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:playingIndex inSection:0];
FeedCell *cell = (FeedCell*)[self.tblView cellForRowAtIndexPath:indexPath]; 

Answer 2

当您调用[self.tblView reloadData]时，您将进度条设置为0.0，在下面的fCell.progressPlay.progress = 0.0行中。删除对reloadData的调用。