Detect device rotation inside a collectionViewCell

Question

Inside a custom collectionVirewCell I create a gradient layer and add it to the cell in the function override func awakeFromNib() {}

 self.layer.insertSublayer(gradient, at: 0)

When the device rotates the size of the cell changes but not the size of the layer. I need to do something like

override func viewDidLayoutSubviews() {
    gradient.frame = self.bounds

}

The problem is that I get an error telling me that viewDidLayoutSubviews() did not override any function from the superclass. Is there any method to detect the cell size variation inside the cell class?

Answer 1

viewDidLayoutSubviews() is a UIViewController method and not a method of UIView which UICollectionViewCell inherits from.

The method you're looking to override is layoutSubviews()

override func layoutSubviews() {
    <#code#>
}

I think that's your problem!