ios - drawRect 圆角

Question

我有 UIVIew 的代码:

override func drawRect(rect: CGRect) {

    let toolbarSize = CGFloat(UIDevice.currentDevice().userInterfaceIdiom == .Pad ? 0 : 54)

    let width = CGRectGetWidth(self.frame)
    let height = CGRectGetHeight(self.frame) - toolbarSize

    let heightSpan = floor(height / 2 - self.cropSize.height / 2)
    let widthSpan = floor(width / 2 - self.cropSize.width / 2)

    // fill outer rect
    UIColor(red: 0, green: 0, blue: 0, alpha: 0.5).set()
    UIRectFill(self.bounds)

    // fill inner border
    UIColor(red: 1, green: 1, blue: 1, alpha: 0.5).set()
    UIRectFrame(CGRectMake(widthSpan - 2, heightSpan - 2, self.cropSize.width + 4,
        self.cropSize.height + 4))

    // fill inner rect
    UIColor.clearColor().set()
    UIRectFill(CGRectMake(widthSpan, heightSpan, self.cropSize.width, self.cropSize.height))
}

这为我的 UIView 绘制了一个带有白色边框的矩形，我想添加一个角半径来绘制一个圆。

这有可能吗？

Answer 1

这很适合我

    someImageView.layer.borderWidth = 1
    someImageView.layer.borderColor = UIColor.blackColor().CGColor
    someImageView.layer.cornerRadius = someImageView.frame.height/2
    someImageView.clipsToBounds = true