定义你的 UICollectionViewCell 这将是你的类型 UICollectionElementKindSectionHeader 的标题视图 - 在我的例子中，我有两个标题 - OfferHeaderCell 和 APRHeaderCell 定义如下：
verticalCollectionView.register(UINib(nibName: "OfferHeaderCell", bundle: nil), forSupplementaryViewOfKind:UICollectionElementKindSectionHeader, withReuseIdentifier: "OfferHeaderCell")
verticalCollectionView.register(UINib(nibName: "APRHeaderCell", bundle: nil), forSupplementaryViewOfKind:UICollectionElementKindSectionHeader, withReuseIdentifier: "APRHeaderCell")
继续为每个部分返回一个标题，然后在此 UICollectionViewDelegateFlowLayout 函数中将部分标题的大小设置为零
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
if(section==0) {
return CGSize.zero
} else if (section==1) {
return CGSize(width:collectionView.frame.size.width, height:133)
} else {
return CGSize(width:collectionView.frame.size.width, height:100)
}
}
为以下两个不同部分定义 viewForSupplementaryElementOfKind 很重要：
func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
var reusableview = UICollectionReusableView()
if (kind == UICollectionElementKindSectionHeader) {
let section = indexPath.section
switch (section) {
case 1:
let firstheader: OfferHeaderCell = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "OfferHeaderCell", for: indexPath) as! OfferHeaderCell
reusableview = firstheader
case 2:
let secondHeader: APRHeaderCell = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "APRHeaderCell", for: indexPath) as! APRHeaderCell
reusableview = secondHeader
default:
return reusableview
}
}
return reusableview
}
最后是数据源，
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 3
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if (section==2) {
return 2
}
return 0
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = verticalCollectionView.dequeueReusableCell(withReuseIdentifier: "ReviseOfferCell", for: indexPath)
cell.backgroundColor = UIColor.white
return cell
}
注意：不要忘记添加 UICollectionFlowLayout 如下：
// MARK: UICollectionViewDelegateFlowLayout
extension MakeAnOfferController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
if indexPath.item == 0 {
return CGSize(width: self.view.frame.size.width, height: 626.0)
}
return CGSize()
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
if(section==0) {
return CGSize.zero
} else if (section==1) {
return CGSize(width:collectionView.frame.size.width, height:133)
} else {
return CGSize(width:collectionView.frame.size.width, height:100)
}
}
}