下面的代码在细节视图控制器中创建了一个带有渐变层的方形 UIView 框架。但是， square.layer.cornerRadius 不显示。它仍然是方形的。
class Colors {
let colorTop = UIColor(red: 68.0/255.0, green: 107.0/255.0, blue: 207.0/255, alpha: 1.0).cgColor
let colorBottom = UIColor(red: 68.0/255.0, green: 108.0/255.0, blue: 179.0/255, alpha: 1.0).cgColor
let gl: CAGradientLayer
init() {
gl = CAGradientLayer()
gl.colors = [ colorTop, colorBottom]
gl.locations = [ 0.0, 1.0]
}
}
class DetailViewController: UIViewController {
func viewWillAppear {
let colors = Colors() // is a class that creates the gradient
let square = UIView(frame: CGRect(x: 18, y: 109, width: 60, height: …