Why is UICollectionViewCell's outlet nil?
IosSwiftInterface BuilderIos8UicollectionviewcellIos Problem Overview
I have created a custom UICollectionViewCell in Interface Builder, binded views on it to the class, and then when I want to use and set a string to the label on the string, tha label has a nil value.
override func viewDidLoad() {
super.viewDidLoad()
// Register cell classes
self.collectionView.registerClass(LeftMenuCollectionViewCell.self, forCellWithReuseIdentifier: "ls")
}
override func collectionView(collectionView: UICollectionView!, cellForItemAtIndexPath indexPath: NSIndexPath!) -> UICollectionViewCell! {
var cell: LeftMenuCollectionViewCell
cell = collectionView.dequeueReusableCellWithReuseIdentifier("ls", forIndexPath: indexPath) as LeftMenuCollectionViewCell
println(cell.label) // <- this is nil, why??
cell.label.text = "asd"
return cell
}
And the subclassed cell:
class LeftMenuCollectionViewCell: UICollectionViewCell {
@IBOutlet weak var imageView: UIImageView!
@IBOutlet weak var label: UILabel!
@IBOutlet weak var activityIndicatorView: UIActivityIndicatorView!
}
Ios Solutions
Solution 1 - Ios
I am calling self.collectionView.registerClass(LeftMenuCollectionViewCell.self, forCellWithReuseIdentifier: "ls")
again. If you are using a storyboard you don't want to call this. It will overwrite what you have in your storyboard.
If you still have the problem check wether reuseIdentifier
is same in dequeueReusableCellWithReuseIdentifier
and in storyboard
.
Solution 2 - Ios
Just remove this line:
self.collectionView.registerClass(LeftMenuCollectionViewCell.self, forCellWithReuseIdentifier: "ls")
Solution 3 - Ios
If you are using xib, make sure that you have added this line of code to your viewdidload.
Objective C:
[self.collectionView registerNib:[UINib nibWithNibName:@"MyCell" bundle:nil] forCellWithReuseIdentifier:@"MyCellIdentifier"];
Swift:
collectionView.register(UINib(nibName:"MyCell", bundle: nil), forCellWithReuseIdentifier:"MyCellIdentifier")
Solution 4 - Ios
Gotta register that nib guys!
collectionView.register(UINib(nibName: "CustomCell", bundle: nil), forCellWithReuseIdentifier: "CustomCellId")
Solution 5 - Ios
Looks like there's two ways to register and I was using the wrong one the first. I have a custom xib view so registered with the second option, and we have data!
1:
collectionView?.register(YourItemClassName.self, forCellWithReuseIdentifier: "yourIdentifier")
2:
collectionView?.register(UINib(nibName: "YourItemClassName", bundle: nil), forCellWithReuseIdentifier: "yourIdentifier")
Solution 6 - Ios
I had a similar problem, but my mistake was that I didn't delegate CollectionViewCell to be able to change the label text..
Solution 7 - Ios
I think that best solution is to directly use from storyboard where add a CollectionView
, in alternative you need to remove a CollectionViewCell
from your CollectionView
in storyboard and register a cell with the following command:
> collectionView?.register(UINib(nibName: "YourItemClassName", bundle: nil), forCellWithReuseIdentifier: "yourIdentifier")
Solution 8 - Ios
You didn't register your cell,
fileprivate let yourIdentifier = ""yourIdentifier"
super.viewDidLoad() {
//here you need to register cell collectionView?.register(NameOfYourClass.self, forCellWithReuseIdentifier: "yourIdentifier") }