IBで四隅それぞれに丸みを設定可能なUIView

忘れないようにメモ

import Foundation

@IBDesignable
class TLViewRadiusMulti: UIView {
    
    //丸み
    @IBInspectable var Radius : CGFloat = 0.0 {
        didSet {
            self.applyRadius();
        }
    }
    
    //左上
    @IBInspectable var TopLeft : Bool = false {
        didSet {
            self.applyRadius();
        }
    }
    
    //右上
    @IBInspectable var TopRight : Bool = false {
        didSet {
            self.applyRadius();
        }
    }
    
    //左下
    @IBInspectable var BottomLeft : Bool = false {
        didSet {
            self.applyRadius();
        }
    }
    
    //右下
    @IBInspectable var BottomRight : Bool = false {
        didSet {
            self.applyRadius();
        }
    }
    
    private func applyRadius(){
        var corners : UIRectCorner = UIRectCorner();
        
        if TopLeft {
            corners = corners.union(.TopLeft);
        }
        if TopRight {
            corners = corners.union(.TopRight);
        }
        if BottomLeft {
            corners = corners.union(.BottomLeft);
        }
        if BottomRight {
            corners = corners.union(.BottomRight);
        }
        
        if corners.rawValue == 0 {
            return ;
        }
        
        let maskPath = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSizeMake(Radius, Radius));
        let maskLayer = CAShapeLayer();
        maskLayer.frame = self.bounds;
        maskLayer.path = maskPath.CGPath;
        self.layer.mask = maskLayer;
    }
}