swift 带有下划线的UIbutton

 

第一种：文字和下划线颜色相同

 

 

    private lazy var checkReasonBtn : UIButton = {
        let btn = JYUIModel.createBtn()
        btn.addTarget(self, action: #selector(clickCheckReasonBtn), for: UIControl.Event.touchUpInside)
        var attributedString = NSMutableAttributedString(string:"查看原因")
        var range = NSRange()
        range.location = 0
        range.length = attributedString.length
        attributedString.addAttributes([NSAttributedString.Key.underlineStyle : NSNumber(value: NSUnderlineStyle.single.rawValue),NSAttributedString.Key.foregroundColor:UIColor.init(hexString: "#4A90E2")], range: range)
        btn.setAttributedTitle(attributedString, for: UIControl.State.normal)
        return btn
    }()

 

 

第二种， 文字和下划线颜色不同

 

 

 

 

 

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import UIKit   /// 带下划线的Button class UnderlineButton: JYBaseButton {           /// 下划线高度     var underLineHeight:CGFloat = 2{         didSet{             //保护             if (underLineHeight > self.bounds.size.height/2) || (underLineHeight < 0){                 underLineHeight = 2             }             self.draw(self.bounds)         }     }           /// 默认下划线颜色     var normalUnderColor:UIColor = UIColor.clear           /// 选中下划线颜色     var selectedUnderColor:UIColor = UIColor.init(hexString: "#FF8437")           convenience init(normalUnderColor:UIColor,                      selectedUnderColor:UIColor,                      underLineHeight:CGFloat){         self.init()         self.normalUnderColor = normalUnderColor         self.selectedUnderColor = selectedUnderColor         self.underLineHeight = underLineHeight     }           override var isSelected: Bool{         didSet{             self.draw(self.bounds)         }     }           override func draw(_ rect: CGRect) {         let textRect : CGRect = self.titleLabel?.frame ?? CGRect.zero         if let contect : CGContext = UIGraphicsGetCurrentContext(){               switch isSelected {             case true:                 contect.setStrokeColor((selectedUnderColor.cgColor))             case false:                 contect.setStrokeColor((normalUnderColor.cgColor))             }             contect.move(to: CGPoint(x: textRect.origin.x, y: self.bounds.size.height - underLineHeight) )             contect.addLine(to: CGPoint(x: textRect.origin.x + textRect.size.width, y: self.bounds.size.height - underLineHeight))             contect.setLineWidth(underLineHeight)             contect.closePath()             contect.drawPath(using: CGPathDrawingMode.stroke)         }     } }