ios - Adjust cellsize for fit all screens?

Question

I'm trying to fit my app to all screensize, however I can't figure out how to. Is it possible to resize the cell depending on the screen? At the moment I just configure my UICollectionView as followed:

 func numberOfSections(in collectionView: UICollectionView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return 1
    }


    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of items
        return fields.count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! FieldDistributionCollectionViewCell


        cell.frame.size = CGSize(width: ?, height: ?)
        return cell
    }

Is there a recommended way? Or do I need to determine the version of the phone and set the size manually? On the smaller screen (4, 4s) I only want 2 columns, but 3 columns on the (5, 5s, 6, 6s). I basically just want the cell size to fit the right resolution.

Answer 1

Try this Code:

Implement the following functions from collectionView's protocol:

  // cell size
 func collectionView(collectionView: UICollectionView,
    layout collectionViewLayout: UICollectionViewLayout,
    sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {

  // To get 1 column
 return CGSize(width: view.frame.size.width, height: view.frame.size.width)

 // To get 2 column
 //return CGSize(width: view.frame.size.width/2, height: view.frame.size.width/2)

 // To get 3 column
 // return CGSize(width: view.frame.size.width/3, height: view.frame.size.width/3)

 // Toget 4 column
 // return CGSize(width: view.frame.size.width/4, height: view.frame.size.width/4)
  }

...where view is your controller's (super) view

 // inter-spacing

func collectionView(collectionView: UICollectionView,
    layout collectionViewLayout: UICollectionViewLayout,
    minimumInteritemSpacingForSectionAtIndex section: Int) -> CGFloat {
return 2.0
}

// line-spacing

func collectionView(collectionView: UICollectionView, layout
    collectionViewLayout: UICollectionViewLayout,
    minimumLineSpacingForSectionAtIndex section: Int) -> CGFloat {
return 2.0
}

CollectionView layout principle.