Why does my UICollectionViewController not show anything? - swift

Question

I'm trying to make a UICollectionViewController show a grid of cells (in which I'll later add text, likely as textViews if possible). I have:
class GridViewController : UICollectionViewController{
//(NOW GONE) #IBOutlet weak var gridViewTable = UICollectionViewController()
let arr1 : [String] = []
let arr2 : [String] = []
override func viewDidLoad(){
super.viewDidLoad()
self.collectionView!.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "gridCell")
}
func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
return 4
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 10
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell{
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "gridCell", for: indexPath as IndexPath)
cell.backgroundColor = UIColor.red
return cell
}
}
I used the interface builder to connect white where the cells will go to the gridViewTable. Nothing shows up at all, even tho it runs and compiles. How can I get the cells to show?

Answer 1

please use these code:
override func numberOfSections(in collectionView: UICollectionView) -> Int {
return 4
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 10
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "gridCell", for: indexPath as IndexPath)
cell.backgroundColor = UIColor.red
return cell
}

Answer 2

You don't need the outlet for a UICollectionViewController, the class itself takes care of that.
Also, make sure that the view controller's class in Interface Builder is set to GridViewController in the Identity Inspector (3rd tab from the left in the right-most pane).