如何以编程方式为 ios、swift 3 中的集合视图单元格提供宽度和高度 [英] How to give width and height programatically for collection view cell in ios, swift 3

问题描述

我试图以编程方式为 collectionViewCell 提供高度和宽度.我使用了以下方法:

I tried to give the height and width for collectionViewCell , programatically. I used following method:

 func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        let viewWidth = self.deviceWidth/3 - 5
        let viewHeight = viewWidth

        return CGSize(width :100,height: 100)
    }

这没有用.甚至这种方法也没有显示为提示.帮我解决这个问题.在 Swift 3 中是否还有其他委托方法可以以编程方式设置单元格宽度和高度?

This didn't work. even this method didn't show as a hint. Help me with this. Is there any other delegate method to set the cell width and height programmatically in Swift 3?

推荐答案

Method collectionView(_:layout:sizeForItemAt:) 是 UICollectionViewDelegateFlowLayout 协议的方法，所以设置delegate和datasource的>collectionView 是不够的，您需要使用您添加了 collectionView 的自定义类来实现 UICollectionViewDelegateFlowLayout 来调用 UICollectionViewDelegateFlowLayout 协议的方法.所以实现 UICollectionViewDelegateFlowLayout 像下面的例子:

Method collectionView(_:layout:sizeForItemAt:) is UICollectionViewDelegateFlowLayout protocol's method, so setting delegate and datasource of collectionView is not enough, you need to implement UICollectionViewDelegateFlowLayout with your custom class where you have added collectionView to call UICollectionViewDelegateFlowLayout protocol's methods. So implement UICollectionViewDelegateFlowLayout like below example:

class ViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {

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