显示节标题UICollectionReusableView [英] Display Section Header UICollectionReusableView

问题描述

我正在使用iOS应用程序，但是在使用UICollectionView单元时遇到了一些问题.

I was working on iOS application and I have several problem about using UICollectionView cell.

这次，我想问一下如何显示UICollectionView(UICollectionReusableView)的节标题

This time, I want to ask about how to display the section header of UICollectionView (UICollectionReusableView)

我已经实现了如下功能:

I already implement the function like below :

public func collectionView(collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView {

        switch kind {

        case UICollectionElementKindSectionHeader:

            let headerView = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "cellHeader", for: indexPath as IndexPath)
            var labelHeader = headerView.viewWithTag(2) as! UILabel

            if indexPath.section == 0 {
                labelHeader.text = "Specialist Clinic"

            }
            else {
                labelHeader.text = "Medical Support"
            }

            headerView.backgroundColor = UIColor.blue;
            return headerView

        default:
            assert(false, "Unexpected element kind")
        }
    }

但是，它总是给出空白结果.请看下面的屏幕截图

but, it always give a blank result. please look at the screen shot below

推荐答案

您需要返回标头的大小.

You need to return size of header .

 func collectionView(_ collectionView: UICollectionView,
                     layout collectionViewLayout: UICollectionViewLayout,
                     referenceSizeForHeaderInSection section: Int) -> CGSize{
       return CGSize(width: CGFloat(collectionView.frame.size.width, height: CGFloat(135)) // you can change here 
    }

代理方法

  func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
            var reusableview: UICollectionReusableView? = nil
            if kind == UICollectionElementKindSectionHeader {
                reusableview = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "cellHeader", for: indexPath) // cellHea is your identifier
            var labelHeader = reusableview.viewWithTag(2) as! UILabel

         if indexPath.section == 0 {
                labelHeader.text = "Specialist Clinic"

            }
            else {
                labelHeader.text = "Medical Support"
            }

            headerView.backgroundColor = UIColor.blue;

            }
            return reusableview!
        }

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