UICollectionView and AutoLayout

Question

UICollectionView and AutoLayout

I am trying to create one UICollectionView

whose width / height and coordinates are defined with AutoLayout (using SnapKit). When using the UICollectionView

default constructor , this does not happen for the following reason:

reason: 'UICollectionView must be initialized with non-nil layout parameter'

The only constructor that allows you to pass the layout also requires frame

, so I tried to use CGRectZero

as a value for frame

so:

collectionView = UICollectionView(frame: CGRectZero, collectionViewLayout: layout)

Then I used SnapKit

to set restrictions like this:

collectionView?.snp_makeConstraints { make -> Void in
        make.width.equalTo(view)
        make.height.equalTo(300)
        make.top.equalTo(someOtherView)
    }

However, it is UICollectionView

never displayed. In fact, I don't see the data source being called at all.

Any thoughts on how to use AutoLayout with UICollectionView

or what I might be doing wrong?

+3

ios autolayout swift

Steve 04 Aug 15 at 16:48

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1 answer

DevAndArtist · Accepted Answer · 2015-08-04T17:26:30+0000

This following code works fine for me and I got a red and empty collection.

Xcode 7 beta 4 - Swift 2.0 - AutoLayout syntax from iOS 9

override func viewDidLoad() {

    super.viewDidLoad()

    let collectionView = UICollectionView(frame: CGRectZero, collectionViewLayout: UICollectionViewLayout())
    collectionView.translatesAutoresizingMaskIntoConstraints = false
    collectionView.backgroundColor = UIColor.redColor()

    self.view.addSubview(collectionView)

    collectionView.widthAnchor.constraintEqualToAnchor(self.view.widthAnchor).active = true
    collectionView.heightAnchor.constraintEqualToConstant(300).active = true
    collectionView.topAnchor.constraintEqualToAnchor(self.view.topAnchor).active = true
}

I've never used it SnapKit

, but I know it. The syntax presented in my code is pretty much the same as in your example. So just a hint what something is wrong with SnapKit

or how you are using it.

Hope this can help you somehow.

UICollectionView and AutoLayout

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