ios - 在 Collection View 的 cellForItemAtIndexPath 方法中更改框架

Question

我是 IOS 新手。

我用过 Collection View 。我在其中使用原型(prototype)单元格。我没有在我的应用中使用自动布局。

我需要在 cellForItemAtIndexPath 中更改按钮和 View 的框架。但是当我第一次滚动移动到下一个单元格时，它没有反射(reflect)第一次。我只能看到没有任何按钮或 View 的空白。我检查了所有的框架是否正确更新。我仍然看不到任何东西。

不过，如果我再次转到上一个电话并返回，它会正常显示。

请在下面找到 cellForItemAtIndexPath 的代码

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{    
     Feed *feed;
    NSMutableAttributedString * string;

    feed = [arrTop objectAtIndex:indexPath.row];

    ShuffleCell *myCell = [collectionView
                         dequeueReusableCellWithReuseIdentifier:@"ShuffleCell"
                         forIndexPath:indexPath];

    myCell.index = indexPath;


    myCell.delegate = self;


   // Below frame changes are not working


        myCell.vwBack.frame = collect.frame;
        myCell.imgShare.frame = CGRectMake(myCell.imgShare.frame.origin.x, myCell.imgShare.frame.origin.y, self.view.frame.size.width,self.view.frame.size.width );
        myCell.lblText.center = CGPointMake(myCell.imgShare.frame.size.width / 2, myCell.imgShare.frame.size.height / 2);
        myCell.lblText.frame = CGRectMake(20
                                          , myCell.imgShare.frame.origin.y + 20, self.view.frame.size.width - 20,self.view.frame.size.width -20);

        int totHeight = (collect.frame.size.height - self.view.frame.size.width);
        myCell.vwBtn.frame = CGRectMake(myCell.vwBtn.frame.origin.x, collect.frame.size.height -totHeight, myCell.vwBtn.frame.size.width, totHeight);
        [myCell.vwBtn setFrame:CGRectMake(myCell.vwBtn.frame.origin.x, collect.frame.size.height -totHeight, myCell.vwBtn.frame.size.width, totHeight)];
        myCell.btnFavoriteBack.frame = CGRectMake(myCell.btnFavoriteBack.frame.origin.x, 0, myCell.btnFavoriteBack.frame.size.width, totHeight/3);
        [myCell.btnFavoriteBack setFrame:CGRectMake(myCell.btnFavoriteBack.frame.origin.x, 0, myCell.btnFavoriteBack.frame.size.width, totHeight/3)];
        myCell.btnShare.frame = CGRectMake(myCell.btnShare.frame.origin.x, (totHeight/3), myCell.btnShare.frame.size.width, totHeight/3);
        myCell.btnReport.frame = CGRectMake(myCell.btnReport.frame.origin.x, (totHeight/3)*2, myCell.btnReport.frame.size.width, totHeight/3);
        myCell.vwLikeBtn.frame = CGRectMake(self.view.frame.size.width - 82, (totHeight/3 - 32)/2, 82,32);

        NSLog(@"Y :- %f",myCell.vwBtn.frame.size.height);





    return myCell;

我还附上了相同的屏幕截图。

感谢您的帮助。

Answer 1

添加此行应该可以解决问题。让单元格的 subview 将它们的框架转换为约束。

cell.label.translatesAutoresizingMaskIntoConstraints = YES;