IOS Swift实现手写签名,签字功能 并转为图片

首先自定义首先签名View

   class SignatureView:UIView {

    let lineWidth = 1 //线条宽度

    let lineColor:UIColor = .black//线条颜色

    var currentPath:UIBezierPath? = nil

    var paths:[UIBezierPath] = []

    init(){
        super.init(frame: CGRect.zero)
        isUserInteractionEnabled = true
       }

    required init ?(coder: NSCoder) {
         fatalError("init(coder:) has not been implemented")
       }
   }

然后监听当前view的点击和移动

override func touchesBegan( _ touches: Set<UITouch>, with event: UIEvent?) {

        let currentPoint = getPoint(touches)

        let path = UIBezierPath()

        path.lineWidth = 1

        path.move(to: currentPoint)

        paths.append(path)

        currentPath = path

    }
  override func touchesMoved( _ touches: Set<UITouch>, with event: UIEvent?) {

        let currentPoint = getPoint(touches)

        currentPath?.addLine(to:currentPoint)

        setNeedsDisplay()

    }

接下来是根据触摸点获取坐标,以及转为图片

//获取点前点击坐标

    func getPoint( _ touches:Set<UITouch>) -> CGPoint{

        let touch = (touches as NSSet).anyObject() as! UITouch

        return touch.location(in: self)

    }

    

    //设置线条颜色

    override func draw( _ rect: CGRect) {

        guard paths.count != 0 else {

            return

        }

        for path in paths {

            lineColor.set()

            path.stroke()

        }

    }

    

    //轻触当前签名

    func clear(){

        paths.removeAll()

        setNeedsDisplay()

    }

    

    //转为图片

    func confirmToImage() ->UIImage?{

        UIGraphicsBeginImageContextWithOptions(self.bounds.size, false, 0)

        guard let context = UIGraphicsGetCurrentContext() else { return nil }

        self.layer.render(in: context)

        guard let image = UIGraphicsGetImageFromCurrentImageContext() else

        { return nil }

        UIGraphicsEndImageContext()

        saveImage(image: image)

        return image

    }

    //保存相册方法

    private func saveImage(image: UIImage) {

        PHPhotoLibrary.shared().performChanges({

            PHAssetChangeRequest.creationRequestForAsset(from: image)

        }, completionHandler: { [(isSuccess, error) in

            DispatchQueue.main.async {

                if isSuccess {// 成功

                    PFHUDView.show("保存成功")

                }

            }

        })

    }