我有一个自定义UICollectionView，总共有4（0,1,2,3）个部分。我正在做的是，如果没有信息显示section 2，那么我将此部分的单元格大小设置为CGSize(width: view.bounds.width, height: 0)。问题是来自第3部分的单元格也没有显示出来，甚至在CGSize(width: view.bounds.width, height: 50)的交换机sizeForItemAtIndexPath上调用了section 3。
到目前为止我发现的是switch cellForItemAtIndexPath case 2 and 3 section 2在这种情况下没有被调用。
我还发现，将return 0设置为section 3个单元格会显示layout。
我认为我遗失的是 func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
switch indexPath.section {
case 0: return CGSize(width: view.bounds.width, height: 50)
case 1: return CGSize(width: view.bounds.width, height: 75)
case 2:
if let description = description , description.characters.count > 0 {
let sizingNibNew = NSBundle.mainBundle().loadNibNamed("BioCollectionViewCell", owner: BioCollectionViewCell.self, options: nil)
let sizingCellNew = sizingNibNew?[0] as! BioCollectionViewCell
sizingCellNew.myText = description
sizingCellNew.initialize()
return CGSize(width: view.bounds.width, height: sizingCellNew.myTextView.frame.height + 10)
} else {
return CGSize(width: view.bounds.width, height: 0)
}
case 3:
return CGSize(width: view.bounds.width, height: 50)
default:
return CGSize(width: view.bounds.width, height: 0)
}
}
func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
return 4
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
switch section {
case 0: return 4
case 1: return 1
case 2: return 1
case 3: return 2
default:
return 0
}
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
switch indexPath.section {
case 0:
switch indexPath.item {
case 0:
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("MapView", forIndexPath: indexPath) as! MapView
if let address = address, let city = city {
cell.setAddressInMapView(address, cityAddress: city)
}
return cell
case 1:
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("TitleCell", forIndexPath: indexPath) as! TitleCell
cell.titleLabel.text = title1
return cell
case 2:
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("NameCell", forIndexPath: indexPath) as! NameCell
cell.nameLabel.text = xName
return cell
case 3: // address
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("AddressCell", forIndexPath: indexPath) as! AddressCell
cell.addressLabel.text = address
return cell
default:
return UICollectionViewCell()
}
case 1:
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("Name", forIndexPath: indexPath) as! ShowFeaturedArtist
cell.xId = id ?? ""
cell.nameLabel.text = name ?? ""
cell.populateViewWithoutQuery()
return cell
case 2:
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("BioCollectionViewCell", forIndexPath: indexPath) as! BioCollectionViewCell
if let description = description where description.characters.count > 0 {
cell.myText = description
}
cell.initialize()
return cell
case 3:
switch indexPath.item {
case 0:
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("UserAttending", forIndexPath: indexPath) as! UserAttending
cell.label.text = "0 " + " Users Attending"
return cell
case 1:
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("UserAttending", forIndexPath: indexPath) as! UserAttending
cell.label.text = "Release Dates"
return cell
default:
return UICollectionViewCell()
}
default:
return UICollectionViewCell()
}
}
中我错误的事情......也许你们其中一人之前遇到过这种情况。
以下是我的一些代码。
<form method="get" enctype="multipart/form-data">
<input type="hidden" value="0" name="foo[]">
<input type="checkbox" value="1" name="foo[]">
</form>
答案 0 :(得分：0)
我不想显示一个部分，int numberOfItemsInSection方法，因为您的判别式（没有要显示的项目）应该为该部分返回0（零），cellForItemAtIndexPath永远不会要求那个部分。
细胞高度的变化不是正确的方法。
答案 1 :(得分：0)
为什么只有在第二部分中显示数据时才将numberOfSectionsInCollectionView方法更改为return 4，否则更改为return 3？
通过这种方式，你不需要改变细胞的高度，这不是一个好的方法。
答案 2 :(得分：0)
通过在numberOfItemsInSection中执行此操作来修复：
switch section {
case 0: return 6
case 1: return 1
case 2:
if show._description?.characters.count > 0 {
return 1
} else {
return 0
}
case 3: return 2