使用 UIBezierPath:byRoundingCorners:使用 Swift 2 和 Swift 3

Using UIBezierPath:byRoundingCorners: with Swift 2 and Swift 3

我正在使用此代码使按钮的两个角变圆。

let buttonPath = UIBezierPath(roundedRect: button.bounds,
                              byRoundingCorners: .TopLeft | .BottomLeft, 
                              cornerRadii: CGSizeMake(1.0, 1.0))

它抛出一个错误:

binary operator '|' cannot be applied to two UIRectCorner operands.

如何在 Swift 2.0 中使用此方法?

Swift 2:

let buttonPath = UIBezierPath(roundedRect: button.bounds, 
                              byRoundingCorners: [.TopLeft , .BottomLeft], 
                              cornerRadii: CGSizeMake(1.0, 1.0))

Swift 3Swift 4:

let buttonPath = UIBezierPath(roundedRect: button.bounds, 
                              byRoundingCorners: [.topLeft ,.bottomLeft], 
                              cornerRadii: CGSize(width:1.0, height:1.0))

在这种情况下,swift 2.0 需要合并两个角。 F. 例如:

let corners = UIRectCorner.TopLeft.union(UIRectCorner.BottomLeft)
let buttonPath = UIBezierPath(roundedRect: button.bounds, 
                              byRoundingCorners: corners,
                              cornerRadii: CGSizeMake(1.0, 1.0))

适用于 Swift 2Swift 3