ios - 用 swift 在段落周围画框

Question

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Answer 1

我建议在用户界面中创建 2 个 UILabel，一个在另一个之上。将他们限制在自己的位置上。然后添加这个扩展:

extension UILabel {
    func roundCorners(corners: UIRectCorner, radius: CGFloat) {
       var bounds: CGRect = self.bounds
       var maskPath: UIBezierPath = UIBezierPath(roundedRect: bounds, byRoundingCorners: corners, cornerRadii: CGSizeMake(radius, radius))
       var maskLayer: CAShapeLayer = CAShapeLayer()
       maskLayer.frame = bounds
       maskLayer.path = maskPath.CGPath
       self.layer.mask = maskLayer
       var frameLayer: CAShapeLayer = CAShapeLayer()
       frameLayer.frame = bounds
       frameLayer.path = maskPath.CGPath
       frameLayer.strokeColor = UIColor.redColor().CGColor
       frameLayer.fillColor = nil
       self.layer.addSublayer(frameLayer)
   }
}

然后将顶部标签的顶角圆化

topLabel.roundCorners(UIRectCorner.TopLeft, radius: 10)
topLabel.roundCorners(UIRectCorner.TopRight, radius: 10)

然后将底部标签的底角圆化

bottomLabel.roundCorners(UIRectCorner.BottomLeft, radius: 10)
bottomLabel.roundCorners(UIRectCorner.BottomRight, radius: 10)

最后，添加边框:

for label in [topLabel, bottomLabel] {
    label.layer.borderColor = UIColor.blueColor.CGColor
    label.layer.borderWidth = 1
}