我有这段代码可以从界面中修改颜色:
@IBDesignable
class GradientView: UIView {
@IBInspectable var firstColor: UIColor = UIColor.clear{
didSet{
updateView()
}
}
@IBInspectable var secondColor: UIColor = UIColor.clear{
didSet{
updateView()
}
}
override class var layerClass: AnyClass{
get{
return CAGradientLayer.self
}
}
func updateView(){
let layer = self.layer as! CAGradientLayer
layer.colors = [ firstColor.cgColor, secondColor.cgColor ]
layer.locations = [ 0.5 ]
}
}
如何在此处添加以修改角度?
答案 0 :(得分:0)
您可以使用endPoint
的属性startPoint
和CAGradientLayer
。像这样:
let x: Double! = angle / 360.0
let a = pow(sinf(Float(2.0 * .pi * ((x + 0.75) / 2.0))),2.0);
let b = pow(sinf(Float(2 * .pi * ((x+0.0)/2))),2);
let c = pow(sinf(Float(2 * .pi * ((x+0.25)/2))),2);
let d = pow(sinf(Float(2 * .pi * ((x+0.5)/2))),2);
我希望这会有所帮助!