ios - 在 swift 中使用 UILabel 的子类设置自定义边框

Question

我为自定义底部边框创建了 UILabel 的子类。子类是: 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 View Controller 中，我正在调用 @IBOutlet 上的类，weak var someLabel:BottomBorderClass

问题是边框和文本未显示。请帮忙!!提前致谢。

Answer 1

像这样改变你的函数。

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)

}

从属性检查器中，不要忘记像这样更改类。

输出: