如何在iOS中动态地在UIView中制作不同的圆角值？

Question

I want to make the different round corners to my view. My views are loading dynamically. Eg: I have 3 views and want to pass the different corner values for each views.

View1 : topLeft : 12 , bottomLeft : 12 , topRight : 4 , bottomRight : 4

View2 : topLeft : 4 , bottomLeft : 4 , topRight : 12 , bottomRight : 12

View3 : topLeft : 4 , bottomLeft : 12 , topRight : 4 , bottomRight : 4

Sample code:

extension UIView{

     enum Corner:Int {
        case bottomRight = 0,
        topRight,
        bottomLeft,
        topLeft
    }

    private func parseCorner(corner: Corner) -> CACornerMask.Element {
        let corners: [CACornerMask.Element] = [.layerMaxXMaxYCorner, .layerMaxXMinYCorner, .layerMinXMaxYCorner, .layerMinXMinYCorner]
        return corners[corner.rawValue]
    }

    private func createMask(corners: [Corner]) -> UInt {
        return corners.reduce(0, { (a, b) -> UInt in
            return a + parseCorner(corner: b).rawValue
        })
    }

    func roundCorners(corners: [Corner], amount: CGFloat) {
        layer.cornerRadius = amount
        let maskedCorners: CACornerMask = CACornerMask(rawValue: createMask(corners: corners))
        if #available(iOS 11.0, *) {
            layer.maskedCorners = maskedCorners
        } else {
            // Fallback on earlier versions
            layer.cornerRadius = 8 // Setting static values for the below versions
        }
    }
}

cardView.roundCorners(corners: [.topRight, .bottomRight], amount: 12).

I want to pass the array of the corner values instead of the single value. expecting to pass like this ratio : [12,4,12,4].

Answer 1

How abount make a struct instead.

struct CornerRadius {
    var topLeft: CGFloat = 0
    var topRight: CGFloat = 0
    var bottomLeft: CGFloat = 0
    var bottomRight: CGFloat = 0

    init(_ topLeft: CGFloat, _ topRight: CGFloat, _ bottomLeft: CGFloat, _ bottomRight: CGFloat) {
        self.topLeft = topLeft
        self.topRight = topRight
        self.bottomLeft = bottomLeft
        self.bottomRight = bottomRight
    }
}

let radius = CornerRadius(0, 8, 10, 11)

I'm not sure if it is the answer you want.

Hopes it could help you.