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iosswiftuicollectionviewuicollectionviewcell
Dom Bryan
Dom Bryan

Reputation: 1268

Swift: UICollectionViewController not displaying any cells

Non of the other question on this topic have worked for me so here goes this one.

No cells are appearing despite, I am programmatically presenting the UICollectionViewController from a UIViewController that is in Storyboard

Note: @IBAction segue is just a button action

This is the UIViewController:

@IBAction func segue(sender: AnyObject) {
    let collectionview = CollectionViewController(collectionViewLayout: UICollectionViewLayout())
    self.presentViewController(collectionview, animated: true, completion: nil)
}

Then this is the UICollectionViewController:

import UIKit

private let reuseIdentifier = "Cell"

class CollectionViewController: UICollectionViewController, UICollectionViewDelegateFlowLayout {

  override func viewDidLoad() {
      super.viewDidLoad()
      collectionView?.backgroundColor = UIColor.brownColor()
      self.collectionView!.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: reuseIdentifier)
  }


  // MARK: UICollectionViewDataSource

  override func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
      return 1
  }


  override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
      return 10
  }

  override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
      let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath)
      cell.backgroundColor = UIColor.blueColor()
      return cell
  }

}

I must be missing something obvious. Thanks in advance to the person who points it out for me.

Upvotes: 1

Views: 2695

Answers (2)

Dom Bryan
Dom Bryan

Reputation: 1268

I figured out the problem, a bit silly really. When presenting the new UICollectionViewController I initialized it wrong. I used UICollectionViewLayout when I needed to use UICollectionViewFlowLayout

@IBAction func segue(sender: AnyObject) {
    let collectionview = CollectionViewController(collectionViewLayout: UICollectionViewFlowLayout())
    self.presentViewController(collectionview, animated: true, completion: nil)
}

Upvotes: 9

riverhawk
riverhawk

Reputation: 236

So I took a jab at it and got this to work:

In your viewDidLoad() method, try this:

    let screenSize = UIScreen.mainScreen().bounds
    let screenWidth = screenSize.width - 25

    let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
    layout.sectionInset = UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
    layout.itemSize = CGSize(width: screenWidth/4, height: screenWidth/4)
    layout.minimumInteritemSpacing = 5
    layout.minimumLineSpacing = 5

    self.collectionView = UICollectionView(frame: CGRectMake(0, 0, self.view.frame.width, self.view.frame.height), collectionViewLayout: layout)
    self.collectionView?.backgroundColor = UIColor.brownColor()
    self.collectionView!.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: reuseIdentifier)

I guess the issue lay in not specifying a UICollectionViewFlowLayout for the cells. This adds 5px spacing between each cell but you can change that if you want. Hope this helps!

Upvotes: 1

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