本文實例為大家分享了iOS實現電子簽名的具體代碼，供大家參考，具體內容如下

實現原理

1、使用拖動手勢記錄獲取用戶簽名路徑.2、當用戶初次接觸屏幕,生成一個新的UIBezierPath,并加入數組中.設置接觸點為起點.在手指拖動過程中為UIBezierPath添加線條,并重新繪制,生成連續的線.3、手指滑動中不斷的重新繪制,形成簽名效果.4、簽名完成,轉化為UIImage保存.

class CXGSignView: UIView { var path: UIBezierPath? var pathArray: [UIBezierPath] = [] override init(frame: CGRect) { super.init(frame: frame) self.backgroundColor = UIColor.gray setupSubviews() } required init?(coder aDecoder: NSCoder) { fatalError('init(coder:) has not been implemented') } func setupSubviews() { let panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(panGestureRecognizerAction(_:))) self.addGestureRecognizer(panGestureRecognizer) } @objc func panGestureRecognizerAction(_ sender: UIPanGestureRecognizer) { // 獲取當前點 let currentPoint = sender.location(in: self) if sender.state == .began { self.path = UIBezierPath() path?.lineWidth = 2 path?.move(to: currentPoint) pathArray.append(path!) }else if sender.state == .changed { path?.addLine(to: currentPoint) } self.setNeedsDisplay() } // 根據 UIBezierPath 重新繪制 override func draw(_ rect: CGRect) { for path in pathArray { // 簽名顏色 UIColor.black.set() path.stroke() } } // 清空 func clearSign() { pathArray.removeAll() self.setNeedsDisplay() } // 撤銷 func undoSign() { guard pathArray.count > 0 else { return } pathArray.removeLast() self.setNeedsDisplay() } /// 簽名轉化為圖片 func saveSignToImage() -> UIImage? { UIGraphicsBeginImageContextWithOptions(self.bounds.size, false, UIScreen.main.scale) guard let context = UIGraphicsGetCurrentContext() else { return nil } self.layer.render(in: context) let image = UIGraphicsGetImageFromCurrentImageContext() UIGraphicsEndImageContext() return image }}

源碼

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