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Question

我想使用此代码将页脚添加到UICollectionView。我在UICollectionView布局中使用自定义布局

添加了委托和数据源方法： -

UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout

viewdDidLoad()函数中的代码： -

 UINib(nibName: "ProfileFooter", bundle:nil)
 collectionView!.registerNib(nibName1, forSupplementaryViewOfKind: UICollectionElementKindSectionFooter, withReuseIdentifier: "ProfileFooter")
        collectionView.registerClass(ProfileFooter.classForCoder(), forSupplementaryViewOfKind: "ProfileFooter", withReuseIdentifier: "ProfileFooter")

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

        var reusable = UICollectionReusableView()

            if kind == UICollectionElementKindSectionFooter{
                let ProfileFooter = collectionView.dequeueReusableSupplementaryViewOfKind(UICollectionElementKindSectionFooter, withReuseIdentifier: "ProfileFooter", forIndexPath: indexPath)
                ProfileFooter.backgroundColor = UIColor.redColor()
                reusable = ProfileFooter
            }

        return reusable
    }

任何人都可以检查这个错误吗？

Answer 1

你忘了在出列时投出你的页脚视图。 试试这个。

override func collectionView(collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView {
switch kind
 {
  case UICollectionElementKindSectionFooter:
      let profileFooter = collectionView.dequeueReusableSupplementaryViewOfKind(UICollectionElementKindSectionFooter, withReuseIdentifier: "ProfileFooter", forIndexPath: indexPath) as! ProfileFooter
      profileFooter.backgroundColor = UIColor.redColor()
      return profileFooter
  case default:
      assert(false, "Unexpected element kind")
 }
}