【问题标题】:how to make dynamic width of the UICollectionViewCell如何使 UICollectionViewCell 的动态宽度
【发布时间】:2016-08-30 09:35:31
【问题描述】:

我想动态设置UICollectionViewCell 的宽度。 我在 swift 中找到了一些代码,我想要 Objective-C 中的代码。

let flowLayout = collectionViewLayout as! UICollectionViewFlowLayout
    if indexPath.item % 3 == 0 {
        let cellWidth = (CGRectGetWidth(collectionView.frame) - (flowLayout.sectionInset.left + flowLayout.sectionInset.right))
        return CGSize(width: cellWidth, height: cellWidth / 2)
    } else {
        let cellWidth = (CGRectGetWidth(collectionView.frame) - (flowLayout.sectionInset.left + flowLayout.sectionInset.right) - flowLayout.minimumInteritemSpacing) / 2
        return CGSize(width: cellWidth, height: cellWidth)
    }

【问题讨论】:

    标签: ios objective-c uicollectionview


    【解决方案1】:

    这是最简单的解决方案。

    你的 UIViewController 应该实现 UICollectionViewDelegateFlowLayout。那么下面的功能需要在你的 UIviewController 上实现。

     func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    
        let width = self.collectionView.frame.size.width / 2;
    
    
        return CGSize(width: width, height: 230)
    
    }
    

    此外,您可以调整情节提要上每个单元格的间距值。单击 collectionView 然后查看尺寸检查器。

    【讨论】:

      【解决方案2】:

      你可以试试这个……

      - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
      
          UICollectionViewFlowLayout *flowLayout = (UICollectionViewFlowLayout*) collectionView.collectionViewLayout;
      
          if (indexPath.item % 3 == 0) {
              float cellWidth = (CGRectGetWidth(collectionView.frame) - (flowLayout.sectionInset.left + flowLayout.sectionInset.right));
              return CGSizeMake(cellWidth, cellWidth / 2);
          } else {
              float cellWidth = (CGRectGetWidth(collectionView.frame) - (flowLayout.sectionInset.left + flowLayout.sectionInset.right) - flowLayout.minimumInteritemSpacing) / 2;
              return CGSizeMake(cellWidth, cellWidth);
          }
      }
      

      【讨论】:

        【解决方案3】:

        将单元格的宽度设置为容器视图的百分比,例如:

        cell.frame = CGRectMake(x, y, self.view.frame.size.width * 20 / 100, height);
        

        或者你可以使用 CollectionView Delegates

        - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
            return CGSizeMake(self.view.frame.size.width*20/100, 192.f);
        }
        

        【讨论】:

          【解决方案4】:

          如果集合视图单元格有文本,你只需要在场景中引用一些没有宽度限制的标签,然后每次在项目大小时,只需将你的文本分配给它,然后调用

          目标 C:

          NSString *text = [arrayOfItems objectAtIndex:indexPath.item];
          _outletoflbl.text = text;
          return CGSizeMake(_outletoflbl.intrinsicContentSize.width + 60, 40);
          

          斯威夫特:

          let text = arrayOfItems[indexPath.item]
          _outletoflbl.text = text
          return CGRect(width:_outletoflbl.intrinsicContentSize.width + 60, height: 40)
          

          关键是_outletoflbl,分配它的标签文本以获得最合适的字体宽度和您从界面生成器分配的其他属性!

          检查结果:

          【讨论】:

            【解决方案5】:

            斯威夫特 2.2

            override func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
                var flowLayout = (collectionView.collectionViewLayout as! UICollectionViewFlowLayout)
                if indexPath.item % 3 == 0 {
                    var cellWidth: Float = (CGRectGetWidth(collectionView.frame) - (flowLayout.sectionInset.left + flowLayout.sectionInset.right))
                    return CGSizeMake(cellWidth, cellWidth / 2)
                }
                else {
                    var cellWidth: Float = (CGRectGetWidth(collectionView.frame) - (flowLayout.sectionInset.left + flowLayout.sectionInset.right) - flowLayout.minimumInteritemSpacing) / 2
                    return CGSizeMake(cellWidth, cellWidth)
                }
            }
            

            Swift 3.0

            override func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
                var flowLayout: UICollectionViewFlowLayout? = (collectionView.collectionViewLayout as? UICollectionViewFlowLayout)
                if indexPath.item % 3 == 0 {
                    var cellWidth: Float? = (collectionView.frame.width - (flowLayout?.sectionInset?.left + flowLayout?.sectionInset?.right))
                    return CGSize(width: CGFloat(cellWidth), height: CGFloat(cellWidth / 2))
                }
                else {
                    var cellWidth: Float? = (collectionView.frame.width - (flowLayout?.sectionInset?.left + flowLayout?.sectionInset?.right) - flowLayout?.minimumInteritemSpacing) / 2
                    return CGSize(width: CGFloat(cellWidth), height: CGFloat(cellWidth))
                }
            }
            

            【讨论】:

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