Shimmer effect to UIView

UIView+Shimmer.swift

extension UIView {

  func startShimmering(){
        let light = UIColor.white.cgColor
        let alpha = UIColor.white.withAlphaComponent(0.7).cgColor
        
        let gradient = CAGradientLayer()
        gradient.colors = [alpha, light, alpha, alpha, light, alpha]
        gradient.frame = CGRect(x: -self.bounds.size.width, y: 0, width: 3 * self.bounds.size.width, height: self.bounds.size.height)
        gradient.startPoint = CGPoint(x: 0.0, y: 0.5)
        gradient.endPoint = CGPoint(x: 1.0, y: 0.525)
        gradient.locations = [0.4, 0.5, 0.6]
        self.layer.mask = gradient
        
        let animation = CABasicAnimation(keyPath: "locations")
        animation.fromValue = [0.0, 0.1, 0.2]
        animation.toValue = [0.8, 0.9, 1.0]
        animation.duration = 1.5
        animation.repeatCount = HUGE
        gradient.add(animation, forKey: "shimmer")
    }
    
    func stopShimmering(){
        self.layer.mask = nil
    }
    
}

Hi I'm trying to implement this to my tableview cells. basically calling start shimmer on custom cells label and image views inside cell for row at index function, but nothing is working, can you give an example on how to use this extension?

Hello, I have not used this extension in TableView. I used it in an ImageView.
See this library for help:
https://github.com/malkouz/ListPlaceholder

Works using gradient.colors = [alpha, light, alpha]

it doesnt work at presented modally viewcontroller, why?

@gali8 Worked! Thanks!

it work with uitableView as well..
gradient.frame = CGRect(x: -self.bounds.size.width, y: 0, width: 3 * self.bounds.size.width, height: self.bounds.size.height)

sometimes when you create your cell using code this line will not work because UIElements do not get frame initially.. please use

gradient.frame = CGRect(x: 0, y: 0, width: (UIScreen.main.bounds.width), height: some static value )