// create a view with size 400 x 400
let view = UIView(frame: CGRect(x: 0, y: 0, width: 400, height: 400))

// Create a gradient layer
let gradient = CAGradientLayer()

// gradient colors in order which they will visually appear
gradient.colors = [UIColor.red.cgColor, UIColor.blue.cgColor]

// Gradient from left to right
gradient.startPoint = CGPoint(x: 0.0, y: 0.5)
gradient.endPoint = CGPoint(x: 1.0, y: 0.5)

// set the gradient layer to the same size as the view
gradient.frame = view.bounds
// add the gradient layer to the views layer for rendering
view.layer.addSublayer(gradient)