Add gradient layer to UIView

There may be a situation  when we want to add gradient  to UIView. As we know every UIView is backed by  a layer.  We can also add or insert as many layers to UIView with different functionality. As we can add gradient color to UIView, add animation layer and many more .

It is very easy to add a layer to UIView as: 

 let topgradientLayer = CAGradientLayer()

  topGredientLayer.frame = yourFrame.bounds

  topGredientLayer.startPoint = CGPointMake(0.5, 1.0)

  topGredientLayer.endPoint = CGPointMake(0.5, 0.0)

  topGredientLayer.colors = [UIColor(colorLiteralRed: 1.0,      green: 1.0, blue: 1.0, alpha: 0.0).CGColor,   UIColor(colorLiteralRed: 1.0, green: 1.0, blue: 1.0, alpha: 1.0).CGColor]

yourFrame.layer.insertSublayer(topGredientLayer, atIndex: 0)

This way we can add a layer to UIVIew.The default layer of UIView resize with  its view  but  sublayer does not resize with its view .

To make this work  we create a subclass of UIView and write above code in awakeFromNib() method . And also override layoutSublayersOfLayer(). 

For example:

override func awakeFromNib() {

  //add your layer here

}

override func layoutSublayersOfLayer(layer: CALayer) {

  yourSubLayer.frame  = self.bounds

}