erreurs BUILDTIME dans IBDesignable pour faire gradient

Question

je tentais de créer des options personnalisées pour gradient utilisant IBDesignable suivant ce tutorial, mais je reçois des erreurs inattendues même juste le code d'adaptation du tutoriel

import UIKit

@IBDesignable 
class GradientView: UIView { 

    @IBInspectable var FirstColor: UIColor.clear{ 
     didSet { 
      updateView() 
     } 
    } 
    @IBInspectable var SecondColor: UIColor.clear{ 
     didSet { 
      updateView() 
     } 
    } 

    @IBInspectable var ThirdColor: UIColor.clear{ 
     didSet { 
      updateView() 
     } 
     func updateView() { 

     } 
    } 
} 

enter image description here

Answer 1

devrait être comme ceci:

import UIKit 

@IBDesignable 
class GradientView: UIView { 
    @IBInspectable var FirstColor: UIColor = .clear { 
     didSet { 
      updateView() 
     } 
    } 

    @IBInspectable var SecondColor: UIColor = .clear { 
     didSet { 
      updateView() 
     } 
    } 

    @IBInspectable var ThirdColor: UIColor = .clear { 
     didSet { 
      updateView() 
     } 
    } 

    func updateView() { 

    } 
} 

Answer 2

Essayez cette

import UIKit 

@IBDesignable class GradientView: UIView { 

    @IBInspectable var topColor: UIColor = UIColor.white { 
     didSet { 
      setNeedsLayout() 
     } 
    } 

    @IBInspectable var bottomColor: UIColor = UIColor.black { 
     didSet { 
      setNeedsLayout() 
     } 
    } 

    @IBInspectable var shadowColor: UIColor = UIColor.black { 
     didSet { 
      setNeedsLayout() 
     } 
    } 

    @IBInspectable var shadowX: CGFloat = 0 { 
     didSet { 
      setNeedsLayout() 
     } 
    } 

    @IBInspectable var shadowY: CGFloat = -3 { 
     didSet { 
      setNeedsLayout() 
     } 
    } 

    @IBInspectable var shadowBlur: CGFloat = 3 { 
     didSet { 
      setNeedsLayout() 
     } 
    } 

    @IBInspectable var startPointX: CGFloat = 0 { 
     didSet { 
      setNeedsLayout() 
     } 
    } 

    @IBInspectable var startPointY: CGFloat = 0 { 
     didSet { 
      setNeedsLayout() 
     } 
    } 

    @IBInspectable var endPointX: CGFloat = 0 { 
     didSet { 
      setNeedsLayout() 
     } 
    } 

    @IBInspectable var endPointY: CGFloat = 0 { 
     didSet { 
      setNeedsLayout() 
     } 
    } 

    @IBInspectable var cornerRadius: CGFloat = 0 { 
     didSet { 
      setNeedsLayout() 
     } 
    } 

    override class var layerClass: AnyClass { 
     return CAGradientLayer.self 
    } 

    override func layoutSubviews() { 
     let gradientLayer = layer as! CAGradientLayer 
     gradientLayer.colors = [topColor.cgColor, bottomColor.cgColor] 
     gradientLayer.startPoint = CGPoint(x: startPointX, y: startPointY) 
     gradientLayer.endPoint = CGPoint(x: endPointX, y: endPointY) 
     layer.cornerRadius = cornerRadius 
     layer.shadowColor = shadowColor.cgColor 
     layer.shadowOffset = CGSize(width: shadowX, height: shadowY) 
     layer.shadowRadius = shadowBlur 
     layer.shadowOpacity = 1 
    } 
}