Question

我想只围绕图像的两个底角。我在Objective-C中发现了很多例子，而Swift几乎没有。

这是我发现的，但它给了我一个错误：

let rectShape = CAShapeLayer()

        rectShape.bounds = self.image.frame
        rectShape.position = self.image.center
        rectShape.path = UIBezierPath(roundedRect: self.image.bounds,     byRoundingCorners: .BottomLeft | .BottomRight, cornerRadii: CGSize(width: 20, height: 20)).CGPath

        self.image.layer.backgroundColor = UIColor.greenColor().CGColor

        self.image.layer.mask = rectShape

我得到的错误与rectShape.path一致，告诉我

No '|' candidates produce the expected contextual result type 'UIRectCorner'

Answer 1

迅速改变我们这样做的方式。在目标c中，可以写一个|分开选项，但在swift中你必须把它像一个数组：

let rectShape = CAShapeLayer()

    rectShape.bounds = self.image.frame
    rectShape.position = self.image.center
    rectShape.path = UIBezierPath(roundedRect: self.image.bounds,     byRoundingCorners: [.BottomLeft, .BottomRight], cornerRadii: CGSize(width: 20, height: 20)).CGPath

    self.image.layer.backgroundColor = UIColor.greenColor().CGColor

    self.image.layer.mask = rectShape

Answer 2

let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: [.TopLeft, .BottomLeft], cornerRadii: CGSize(width: 3, height: 3 ))

如何使用Swift仅对图像的某些角进行圆角处理

2 个答案: