在 swift 中使用 UILabel 的子类设置自定义边框

Question

我已经为自定义底部边框创建了 UILabel 的子class。 subclass 是：导入 UIKit

class BottomBorderClass: UILabel {


    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)!
        self.setBottomBorder()
    }

    override init(frame: CGRect) {
        super.init(frame:frame)
        self.setBottomBorder()
    }

    func setBottomBorder()
    {

    self.text = "TITLE LABEL"
        self.textColor = UIColor.grayColor()
        let layer:CALayer = self.layer
        let bottomBorder:CALayer = CALayer.init(layer: layer)
        bottomBorder.borderColor = UIColor.whiteColor().CGColor
        bottomBorder.borderWidth = 2;
        bottomBorder.frame = CGRectMake(-1, self.layer.frame.size.height-1, 
        self.layer.frame.size.width, 2);
        bottomBorder.borderColor = UIColor.whiteColor().CGColor
        self.layer.addSublayer(bottomBorder)

    }
  }

在视图控制器中，我在@IBOutlet weak var someLabel:BottomBorderClass

上调用 class

问题是边框和文本没有显示。请帮忙！！提前致谢。

Answer 1

像这样更改您的函数。

func setBottomBorder(){

    let borderWidth:CGFloat = 4.0 //Change this according to your needs
    let lineView = UIView.init(frame: CGRect.init(x: 0, y:self.frame.size.height - borderWidth , width: self.frame.size.width, height: borderWidth))
    lineView.backgroundColor = UIColor.green
    self.addSubview(lineView)

}

在您的属性检查器中，不要忘记像这样更改 class。

输出：

Answer 2

您可以为 CALayer 创建一个扩展

import Foundation
import UIKit

extension CALayer {

    func addBorder(edge: UIRectEdge, color: UIColor, thickness: CGFloat) {

        let border = CALayer()

        switch edge {
        case UIRectEdge.top:
            border.frame = CGRect.zero
            border.frame = CGRect(x: 0, y: 0, width: self.bounds.width, height: thickness)
            break
        case UIRectEdge.bottom:
            border.frame = CGRect(x: 0, y: self.bounds.height - thickness, width: self.bounds.width, height: thickness)
            break
        case UIRectEdge.left:
            border.frame = CGRect(x: 0, y: 0, width: thickness, height: self.bounds.height)
            break
        case UIRectEdge.right:
            border.frame = CGRect(x: self.bounds.width - thickness, y: 0, width: thickness, height: self.bounds.height)
            break
        default:
            break
        }

        border.backgroundColor = color.cgColor;

        self.addSublayer(border)
    }
}

在你的控制器中，例如：

@IBOutlet weak var someLabel: UILabel !
someLabel.layer.addBorder(edge: UIRectEdge.bottom, color: UIColor.red, thickness: 2)

使用此方法，您可以将 addBorder 函数与任何 UILabel、UIButton 等一起使用...

在 swift 中使用 UILabel 的子类设置自定义边框

Setting custom border using sublass of UILabel in swift

xcode

subclass

uilabel

ios

swift