如何在UICollectionView中每行显示3个单元格? [英] How to display 3 cells per row in UICollectionView?

问题描述

我根据这篇文章使用了自定义流程布局. 这是我的实现:

I used a custom flow layout according to this post. Here is my implementation:

@implementation CustomLayout
-(void)prepareLayout{
[super prepareLayout];
//    [self invalidateLayout];
if(self.collectionView){
    CGSize newItemSize=self.itemSize;

// Number of items per row
    int itemsPerRow=3;

    float totalSpacing=self.minimumLineSpacing*(itemsPerRow-1);

    newItemSize.width=(self.collectionView.bounds.size.width -totalSpacing)/itemsPerRow;

    if(self.itemSize.height>0){
        float itemAspectRatio=self.itemSize.width/self.itemSize.height;
        newItemSize.height=newItemSize.width/itemAspectRatio;
    }

    [self setItemSize:newItemSize];

}


}
@end

这就是我得到的: 我错过了什么?我遇到过其他一些SO帖子，但到目前为止还没有运气.

This is what I've got: What did I miss? I've come across some other SO posts but no luck so far.

推荐答案

Swift 3.0.适用于水平和垂直滚动方向以及可变间距

声明每行所需的单元格数量

Declare number of cells you want per row

let numberOfCellsPerRow: CGFloat = 3

配置flowLayout以呈现指定的numberOfCellsPerRow

if let flowLayout = collectionView?.collectionViewLayout as? UICollectionViewFlowLayout {
    let horizontalSpacing = flowLayout.scrollDirection == .vertical ? flowLayout.minimumInteritemSpacing : flowLayout.minimumLineSpacing
    let cellWidth = (view.frame.width - max(0, numberOfCellsPerRow - 1)*horizontalSpacing)/numberOfCellsPerRow
    flowLayout.itemSize = CGSize(width: cellWidth, height: cellWidth)
}

这篇关于如何在UICollectionView中每行显示3个单元格?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！