以编程方式将UICollectionViewCell宽度设置为UICollectionView宽度 [英] Set UICollectionViewCell width programmatically to UICollectionView width

问题描述

在集合视图中，我们如何根据整个集合视图设置宽度和高度的像元大小。它将设置小到大的设备（例如：如果集合视图的总宽度= 375.0000，我们将其分为3.因此它将为所有大型和小型设备设置。）

In the collection view how do we set the cell size of width and height based on the overall collection view. it will set for small to large devices (for example : if the collection view overall width = 375.0000 and we divide into 3. so it will set for the all the large and small devices).

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {

    NSLog(@"SETTING SIZE FOR ITEM AT INDEX %d", (int)indexPath.row);
    CGSize mElementSize = CGSizeMake(125, 125);
    return mElementSize;
}

推荐答案

在代码中设置UICollectionViewDelegateFlowLayout方法

Set UICollectionViewDelegateFlowLayout method in your code

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
{ 
    return CGSize(width:(collectionView.bounds.size.width/numberOfCellInRow), height:270)
} 

并且还在单元格的awakeFromNib（）方法中添加这两行，以根据单元格大小更新单元格的约束。

And also add this two line in your cell's awakeFromNib() method for update your cell's constraint according to cell size.

override func awakeFromNib()
{ 
    self.contentView.autoresizingMask.insert(.flexibleHeight)
    self.contentView.autoresizingMask.insert(.flexibleWidth)
}

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