IOS, swift - UICollectionReusableView not working - ios

Question

I want to make collection view header but it isn't working.
Storyboard
On device
My code below is not working, print("ssssss") don't show.
override func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
print("sssssss")
switch kind {
case UICollectionElementKindSectionHeader:
let headerView = collectionView.dequeueReusableSupplementaryView(ofKind: kind,
withReuseIdentifier: "mypageheader",
for: indexPath) as! MyPageHeaderView
headerView.backgroundColor = UIColor.blue;
return headerView
default:
assert(false, "Unexpected element kind")
}
}
on viewDidLoad()
self.collectionView?.register(MyPageViewController.self,forSupplementaryViewOfKind: UICollectionElementKindSectionHeader,withReuseIdentifier: "mypageheader")

Answer 1

You should implement this delegate method:
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
referenceSizeForHeaderInSection section: Int) -> CGSize {
return CGSize(width: collectionView.bounds.width, height: 100)
}
Don't forget to setup the delegate of your collectionView in the storyboard!

Answer 2

If you are configuring custom view via .xib/storyboard, you don't need to add the following method in the viewDidload:
self.collectionView?.register(MyPageViewController.self,forSupplementaryViewOfKind: UICollectionElementKindSectionHeader,withReuseIdentifier: "mypageheader")
Select the view in storyboard and Go to the identity inspector, and link the Class nad Module
Then go to the attribute inspector and ann the identifier:
And make sure to add the method in your code:
func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
let header = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "HomeListTopCollectionReusableViewId", for: indexPath) as! HomeListTopCollectionReusableView
return header
}