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Andy Jacobs
Andy Jacobs

Reputation: 15245

Swift 'does not have a member named'

Is there a solution for this problem ?

class ViewController : UIViewController {
    let collectionFlowLayout = UICollectionViewFlowLayout()
    let collectionView = UICollectionView(frame: CGRectZero, collectionViewLayout: collectionFlowLayout)
}

xcode gives me the following error

ViewController.swift: 'ViewController.Type' does not have a member named 'collectionFlowLayout'

i could make it an optional and initialise it in the init method, but i'm looking for a way to make the collectionview a let and not a var

Upvotes: 6

Views: 8029

Answers (3)

Darren
Darren

Reputation: 25619

You can assign initial values to constant member variables in your initializer. There's no need to make it a var or optional.

class ViewController : UIViewController {
    let collectionFlowLayout = UICollectionViewFlowLayout()
    let collectionView : UICollectionView

    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?)
    {
        self.collectionView = UICollectionView(frame: CGRectZero, 
                                collectionViewLayout: self.collectionFlowLayout);

        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil);
    }

    required init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

Upvotes: 3

billyklh
billyklh

Reputation: 49

Setting let variables(constants) in the init method:

class ViewController : UIViewController {
    let collectionFlowLayout: UICollectionViewFlowLayout!
    let collectionView: UICollectionView! 

    init() {
        super.init()
        self.collectionFlowLayout = UICollectionViewFlowLayout()
        self.collectionView = UICollectionView(frame: CGRectZero, collectionViewLayout: collectionFlowLayout)
    }
}

We can access the let variables with self.

Hope that it works for you.

Upvotes: 1

Greg
Greg

Reputation: 25459

At that point there is not collectionFlowLayout created so it complains that there is no member named like that.

The solution can be as you mentioned to make it optional and initialise it in init or you can do this:

let collectionView = UICollectionView(frame: CGRectZero, collectionViewLayout: UICollectionViewFlowLayout())

Upvotes: 0

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