cellForItemAtIndexPath：[NSIndexPath indexPathForItem：3 inSection：0]返回带有UIProgressView的随机项目

Question

我正在使用自定义的UICollectionViewCell编码UICollectionView，以允许更新进度。但是当我打电话给cellForItemAtIndexPath:[NSIndexPath indexPathForItem:3 inSection:0]时，返回的单元格可以是随机的。

    [self.collectionView registerNib:[UINib nibWithNibName:@"CollectionViewCell" bundle:nil] forCellWithReuseIdentifier:CollectionViewCellId];
//    [self.collectionView registerClass:[CollectionViewCell class] forCellWithReuseIdentifier:CollectionViewCellId];
self.collectionView.delegate = self;
self.collectionView.dataSource = self;

timer = [NSTimer scheduledTimerWithTimeInterval:0.1 repeats:YES block:^(NSTimer * _Nonnull timer) {
    percentage += 0.1;
    CollectionViewCell *item = (CollectionViewCell*)[self.collectionView cellForItemAtIndexPath:[NSIndexPath indexPathForItem:3 inSection:0]];
    if (item) {
        //            if (self.collectionView.reloaded) {
        [item.progressView setProgress:percentage];

        //                [self.collectionView reloadData];
        //            }
        if (reloaded) {
            reloaded = NO;
            [self reloadDataAndWait:^{
                reloaded = YES;
            }];
        }

    }
}] ;

代码项目是附加文件。 https://github.com/muhku/FreeStreamer/files/2247985/CollectionView.zip