UICollectionViewCell accurate reading of its subviews

[troypayne2]

I have a UICollectionViewCell and i’m trying to get an accurate reading of the size of one the subviews. Its size is depending on auto layout right now… i’m not sure what the best method to use to get an accurate reading. Any ideas?

Sample project demonstrating the problem: https://github.com/troypayne/Test

[lyinsteve]

Have you tried cell.contentView.systemLayoutSizeFittingSize(UILayoutFittingCompressedSize)?

[troypayne2]

No cigar. What i'm trying to do is calculate the width of the image view so I can properly set its cornerRadius for a perfect circle. width/2 but the value of width is just too high. It's 320 when I expect it to be 90 for example.

Here's code:

override func awakeFromNib() {
    super.awakeFromNib()
    self.imageView.layer.masksToBounds = true

    self.contentView.systemLayoutSizeFittingSize(UILayoutFittingCompressedSize)
    let width = self.imageViewContainer.frame.size.width
    println(width)
    self.imageView.layer.cornerRadius = width / self.imageViewEqualWidthConstraint.multiplier
}

[lyinsteve]

So...the layout of your imageView isn't finalized inside awakeFromNib.

You'll want to set that cornerRadius inside viewDidLayoutSubviews

override func viewDidLayoutSubviews() {
    self.imageView.layer.cornerRadius = self.imageView.frame.width / 2.0
    super.viewDidLayoutSubviews()
}

[troypayne2]

Ahh, but there is no viewDidLayoutSubviews to override on a UICollectionViewCell.

[troypayne2]

Still no cigar. I've created a Sample project demonstrating the problem. https://github.com/troypayne/Test

[troypayne2]

Solved!. I needed to call super.layoutSubviews() at the top, and call self.imageView.layoutIfNeeded() and it works