使用Swift 5在UIView中绘制签名

import UIKit

class SignatureView: UIView {
    private var path = UIBezierPath()
    
    override func draw(_ rect: CGRect) {
        UIColor.black.setStroke()
        path.stroke()
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        path.lineWidth = 2.0
    }
    
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        guard let touch = touches.first else { return }
        let location = touch.location(in: self)
        path.move(to: location)
    }
    
    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        guard let touch = touches.first else { return }
        let location = touch.location(in: self)
        path.addLine(to: location)
        setNeedsDisplay()
    }
    
    func clear() {
        path.removeAllPoints()
        setNeedsDisplay()
    }
}

let signatureView = SignatureView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
view.addSubview(signatureView)