UIView gradient as an extension applied multiple times

Asked Aug 29 '20 at 01:28

Active Aug 29 '20 at 01:45

Viewed 48 times

I have an extension to add gradient to a view.

    func applyLinearGradient(firstColor: UIColor, secondColor: UIColor, startPoint: CGPoint, endpoint: CGPoint, locations: [NSNumber]) {
        let gradientLayer = CAGradientLayer()
        gradientLayer.colors = [firstColor.cgColor, secondColor.cgColor]
        gradientLayer.startPoint = startPoint
        gradientLayer.endPoint = endpoint
        gradientLayer.locations = locations
        gradientLayer.frame = bounds
        
        layer.insertSublayer(gradientLayer, at: 0)
    }

    @IBOutlet weak var titleView: UIView!
    @IBOutlet weak var titleTxt: UILabel!
    
    ...

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        
        //add gradient under the title
        titleView.applyLinearGradient(firstColor: UIColor(named: "PrimaryColor") ?? UIColor.clear, secondColor: UIColor.clear, startPoint: CGPoint(x: 0.5, y: 1.0), endpoint: CGPoint(x: 0.5, y: 0.0), locations: [0, 1])
    }

The problem is that when I call it in viewDidLayoutSubviews it's applied 2 times.

I can just create a gradientview that extends from uiview, but is it possible to make it work with just an extension?

I'm using storyboards.

edited Aug 29 '20 at 01:45

asked Aug 29 '20 at 01:28

kironet

How are you calling the extension method? – Sweeper Aug 29 '20 at 01:29
@Sweeper updated my question with code. – kironet Aug 29 '20 at 01:30
your code will add a new gradient every time viewDidLayoutSubviews is called – Leo Dabus Aug 29 '20 at 01:33
You should subclass UIView and create your own gradient view https://stackoverflow.com/questions/24380535/how-to-apply-gradient-to-background-view-of-ios-swift-app/37243106?r=SearchResults&s=1|85.6047#37243106 – Leo Dabus Aug 29 '20 at 01:35
Ahh, I wanted to avoid that. Thanks :) – kironet Aug 29 '20 at 01:36

UIView gradient as an extension applied multiple times

0 Answers0