将渐变层添加到uiviewcontroller uiview

Question

I am trying to create a simple gradient for the background of a UIViewController. My code is:

    let gradientLayer = CAGradientLayer()
    gradientLayer.frame = view.bounds
    let bottomColor = UIColor(hue: 208 / 360, saturation: 82 / 100, brightness: 0.9, alpha: 1)
    let topColor = UIColor(hue: 208 / 360, saturation: 41 / 100, brightness: 0.9, alpha: 1)
    gradientLayer.colors = [bottomColor, topColor]
    gradientLayer.startPoint = CGPoint(x: 0.5, y: 0.1)
    gradientLayer.endPoint = CGPoint(x: 0.5, y: 0.0)

    view.layer.addSublayer(gradientLayer)

The gradient does not show. When I look in the view debugger, I do not see it. I check the frame of the view and it looks ok

x: 0, y:0, width: 375, height: 667

I've tried the view.layer.insert at method as well, but that did not work. If I do

view.layer.backgroundColor.orange

then I do see an orange background. Am I missing something?

Answer 1

Change

gradientLayer.colors = [bottomColor, topColor]

to

gradientLayer.colors = [bottomColor.cgColor, topColor.cgColor]