CODEWITHSUNDEEP
iosswiftuicollectionviewswift4
Amit Pal
Amit Pal

Reputation: 11052

How to access outlets from UICollectionView to UICollectionReusableView?

Registered header in ViewController:

self.itemCollectionView.register(NewSubscriptionRequestCollectionReusableView.self, forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: "NewSubscriptionRequestCollectionReusableView")

In the CollectionView Delegate Method:

extension UpcomingSubscriptionListViewController:  UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {

func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {

    let headerView = itemCollectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "NewSubscriptionRequestCollectionReusableView", for: indexPath) as! NewSubscriptionRequestCollectionReusableView
    headerView.newSubscriptionRequestViewDelegate = self
    return headerView
}

My Header collection file

protocol NewSubscriptionRequestViewDelegate : class {

}

class NewSubscriptionRequestCollectionReusableView: UICollectionReusableView {

weak var newSubscriptionRequestViewDelegate:  NewSubscriptionRequestViewDelegate?
var contentView : NewSubscriptionRequestCollectionReusableView?

override init(frame: CGRect) {
    super.init(frame: frame)
    let contents = Bundle.main.loadNibNamed("NewSubscriptionRequestCollectionReusableView", owner: self, options: nil)?.first as! NewSubscriptionRequestCollectionReusableView
    contents.frame.size.width = UIScreen.main.bounds.width
    contents.autoresizingMask = [.flexibleWidth, .flexibleHeight]

    self.addSubview(contents)
}

@IBOutlet var pdfStatus: UILabel!
@IBOutlet var nutritionView: UIView!
@IBOutlet var dateView: UIView!
@IBOutlet var nutritionPlanLabel: UILabel!
@IBOutlet var calendarLabel: UILabel!

override func awakeFromNib() {
    super.awakeFromNib()
    dateView.layer.cornerRadius = 10
    nutritionView.layer.cornerRadius = 10
}


required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}
}

I want to change the pdfStatus label from the viewController class but when I am trying to achieve through the following code. It's giving me nil

func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {

   let headerView = itemCollectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "NewSubscriptionRequestCollectionReusableView", for: indexPath) as! NewSubscriptionRequestCollectionReusableView
    headerView.newSubscriptionRequestViewDelegate = self
    headerView.pdfStatus.text = "something" .  // Getting nil here
    return headerView
}

Upvotes: 2

Views: 658

Answers (1)

Changnam Hong
Changnam Hong

Reputation: 1679

You implement wrong methods when you register your reusableView. You need to register your reusableView using this method.

collectionView.register(UINib, forSupplementaryViewOfKind:, withReuseIdentifier:)

Not

collectionView.register(Class, forSupplementaryViewOfKind:, withReuseIdentifier:)

If you don't register your XIB, UICollectionView don't have any data about IBOutlet(IBAction also). So Your cell can be created with a defined init method, but IBOutlet is nil.

So your code should be like

self.itemCollectionView.register(UINib(nibName: "NewSubscriptionRequestCollectionReusableView", bundle: nil), forSupplementaryViewOfKind: "NewSubscriptionRequestCollectionReusableView", withReuseIdentifier: "NewSubscriptionRequestCollectionReusableView")

registerNib:forCellWithReuseIdentifier:

Upvotes: 2

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