UIcollectionview cell issue Swift - ios

Question

I have a simple collectionview controller like this:
class ViewController1: UICollectionViewController{
override func viewDidLoad() {
super.viewDidLoad()
self.collectionView?.delegate = self
self.collectionView?.dataSource = self
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 5
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "P", for: indexPath)
return cell
}
}
In the cell there is only an uiimageview and it has this constraints:
My problem is this:
when I execute this code on iPhone 6 simulator I get this (right way):
but when I execute this code on iPhone 5 simulator I get this (wrong way: the imageview starts before the screen on the left and the width and height are wrong respect to the constraints):
I am going crazy for this problem but I dont be able to solve.
Can you help me?

Answer 1

You need to extend your ViewController1 to conform to UICollectionViewDelegateFlowLayout protocol. And implement methods to set size for each collection view cell like so:
class ViewController1: UICollectionViewController, UICollectionViewDelegateFlowLayout {
override func viewDidLoad() {
super.viewDidLoad()
self.collectionView?.delegate = self
self.collectionView?.dataSource = self
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
print(self.collectionView!.frame)
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 5
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "P", for: indexPath)
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: self.collectionView!.frame.size.width, height: 120.0)
}
}
It has hard coded values, but you should get the idea. Collection View width should be the max size for each item, so they won't get outside the box.