Must call a designated initializer of the superclass 'UICollectionView'

Question

Trying to initialize a collection view class and getting the following error:

Must call a designated initializer of the superclass 'UICollectionView'

data is being passed from another ViewController and I wish to draw out the frame from within the ViewController when a user searches.

class searchLocationsCollectionViewManager: UICollectionView, UICollectionViewDataSource, UICollectionViewDelegate {

weak var collectionView: UICollectionView! {
    didSet {
        collectionView.dataSource = self
        collectionView.delegate = self
    }
}

// Data handler
var data: [[String:Any]]? {
    didSet {
        print(data!)
        //collectionView.reloadData()
    }
}

init(collectionView: UICollectionView, frame: CGRect) {
    self.collectionView = collectionView
    super.init()
}

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



func numberOfSections(in collectionView: UICollectionView) -> Int {
    return 1
}

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 3
}

// This is the current method for returning the cell.
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {




    return UICollectionViewCell()

}

Any ideas on why the above is happening?

What is the purpose of an UICollectionView property in an UICollectionView subclass? Consider that didSet is not called when the initial value is assigned. And in case you mean UICollectionViewController there is already an UICollectionView property. — vadian
– vadian, Commented Feb 2, 2017 at 10:39

Nirav D · Accepted Answer · 2017-02-02 10:36:26Z

8

You need to call designated initializer init(frame:collectionViewLayout:) of UICollectionView.

init(collectionView: UICollectionView, frame: CGRect) {        
    self.collectionView = collectionView
    //Setup collectionView layout here and pass with init 
    let layout = UICollectionViewLayout()
    super.init(frame: frame, collectionViewLayout: layout)
}

answered Feb 2, 2017 at 10:36

Nirav D

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4 Comments

Marlhex Over a year ago

My class is extending from UICollectionView and it doesn't have collectionView property saying: Value of type 'MyCollectionView' has no member 'collectionView'

Marlhex Over a year ago

Why this is only for UICollectionViewController?

Marlhex Over a year ago

Why UICollectionView doesn't have collectionView

Nirav D Over a year ago

@Daniella because UICollectionView don't have collectionView property you need to create object of your MyCollectionView which extends UICollectionView.

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