CODEWITHSUNDEEP
swiftuicollectionview
Matt Harris
Matt Harris

Reputation: 177

SizeForItemAtIndexPath: get items standard size

I'm using the sizeForItemAtIndexPath function in a view controller that has two collection views.

How can I exclude one collection view in sizeForItemAtIndexPath function, or how could I get the original cell size without changing anything?

Upvotes: 0

Views: 1269

Answers (2)

dengApro
dengApro

Reputation: 4008

  • to exclude one collection view 

     func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
      // to exclude one collection view
      if collectionView == collectionViewOne {}// first
     if collectionView.tag == number(you set before){}// second

     // to get the original cell size without changing anything
     //let yourSize = collectionViewLayout.itemSize
     //return collectionViewLayout.itemSize   // if you have set it globally, 
    /*
     But you can not get it, because itemSize is a property of UICollectionViewFlowLayout.

     And you can't cast collectionViewLayout to UICollectionViewFlowLayout Class which is kind of UICollectionViewLayout Class .

   Thats not how inheritance works.
  */    
}

  • to get the original cell size without changing anything

    let indexPath = IndexPath(item: number(you choose), section: number(you choose, 0 or 1))
let layout = UICollectionViewFlowLayout() // you set
// got the size
// more generally, if you have set layout per item through delegate.
let size = self.collectionView(collectionViewOne, layout: layout, sizeForItemAtIndexPath: indexPath)
// or try this ,if you have configured globally
let itemSize = layout.itemSize

Upvotes: 2

Pranav Kasetti
Pranav Kasetti

Reputation: 9925

Assuming you're using storyboards, you can connect each collection view as an outlet to your view controller. E.g

@IBOutlet weak var collectionViewOne: UICollectionView!
@IBOutlet weak var collectionViewTwo: UICollectionView!

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
  if collectionView == collectionViewOne {
    // Do nothing, and set default size.
    return layout.itemSize
  } else {
    //Set size here along with other setup.
    return CGSize(width: 150, height: 150)
  }
}

Upvotes: 1

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