UICollectionViewCell With Storyboard

Question

I have a UICollectionView in Storyboard, in a UICollectionViewController. The UICollectionViewController is linked to my custom class MasterViewController: UICollectionViewController, UICollectionViewDataSource, UICollectionViewDelegate, and it's delegate and datasource are linked in the storyboard to this class.

I have a prototype UICollectionViewCell in storyboard, with an identifier "MyCell", from my custom class Cell: UICollectionViewCell

In the cellForItemAtIndexPath method, the app crash at the line : let cell:Cell = collectionView.dequeueReusableCellWithReuseIdentifier("MyCell", forIndexPath: indexPath) as Cell

I don't find why. I haven't implemented the registerClass:forCellWithReuseIdentifier: method, and the identifier of the storyboard is exactly "MyCell", I checked many times, and the delegate and datasource are linked to the right class.

When the app crash, nothing is printed in the console, just "(lldb)"

Here's my code :

class MasterViewController: UICollectionViewController,UICollectionViewDataSource,UICollectionViewDelegate {


var objects = [ObjectsEntry]()

@IBOutlet var flowLayout: UICollectionViewFlowLayout!

override func awakeFromNib() {
    super.awakeFromNib()
}


override func viewDidLoad() {
    super.viewDidLoad()

    flowLayout.itemSize = CGSizeMake(collectionView!.bounds.width - 52, 151)

}



// MARK: - Collection View

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

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

override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell:Cell = collectionView.dequeueReusableCellWithReuseIdentifier("MyCell", forIndexPath: indexPath) as Cell

    return cell

}

Answer 1

I had the same problem. Raywenderlich Swift manual helped me. I copying MyCollectionViewController here.

• Identifier must match in controller and Storyboard.
• Create custom UICollectionViewCell class.
• Set this UICollectionViewCell in Storyboard.
• Do not call viewDidLoad().
• Do not call registerClass:forCellWithReuseIdentifier:

• Set cell item size with UICollectionViewDelegateFlowLayout in collectionView:layout:sizeForItemAtIndexPath:.

  import UIKit
  
  class MyCollectionViewController:
  UICollectionViewController,
  UICollectionViewDelegateFlowLayout {
  
  private let reuseIdentifier = "ApplesCell"
  
  // MARK: UICollectionViewDataSource
  
  override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
      return 1
  }
  
  override func collectionView(collectionView: UICollectionView,
             cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
      let cell  = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as MyCollectionViewCell
      cell.backgroundColor = UIColor.redColor()
      cell.imageView.image = UIImage(named: "red_apple")
      return cell
  }