如何在 pdf 视图上移动/拖动多个视图？

Question

我正在做的是，我查看了 pdf 视图，它包含一个示例 pdf。 最重要的是，当用户单击导航栏中的添加按钮时，我添加了超过 1 个签署者（自定义视图）视图。

场景 1：当在 pdf 上添加第一个签署人视图 (customview) 时，它正在添加，我可以在 pdf 上拖动/移动第一个签署人视图 (Signatory1)，这工作正常。

场景 2：当在 pdf 上添加第二个签署人视图 (Signatory2 customview) 时，它正在添加，我可以在 pdf 上拖动/移动第二个签署人视图 (Signatory2)，这也可以正常工作，但在这种情况下，我无法移动/拖动第一个签名者视图 (Signatory1)

场景 3：类似地，当在 pdf 上添加第三个 Signatory 视图 (Signatory3 customview) 时，它正在添加，我可以在 pdf 上拖动/移动第三个 Signatory 视图 (Signatory3)，这也可以正常工作，但在这种情况下，我无法移动/拖动第一个签署人视图 (Signatory1) 和第二个签署人视图 (Signatory2) 等等

问题是，我只能访问当前的签署人（我只能移动/拖动最近添加的当前签署人视图），我无法移动/拖动旧的签署人视图。

当我单击/触摸（拖动/移动）pdf 视图上的任何特定签署人视图时，如何根据我的选择移动/拖动任何签署人？

这是一些代码，

override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    
        customView1 = SignatoryXibView(frame: CGRect(x: 30, y: 30, width: 112, height: 58))
        customView2 = SignatoryXibView(frame: CGRect(x: 30, y: 30, width: 112, height: 58))
        customView3 = SignatoryXibView(frame: CGRect(x: 30, y: 30, width: 112, height: 58))
        customView4 = SignatoryXibView(frame: CGRect(x: 30, y: 30, width: 112, height: 58))
        customView5 = SignatoryXibView(frame: CGRect(x: 30, y: 30, width: 112, height: 58))
        
        loadPdf()
    
    }
    
    func loadPdf(){
        
        if let path = Bundle.main.path(forResource: "appointment-letter", ofType: "pdf") {
            if let pdfDocument = PDFDocument(url: URL(fileURLWithPath: path)) {
                pdfView.displayMode =  .singlePage // .singlePage //.singlePageContinuous //.twoUp
                //by default display mode is - singlePageContinuous
                pdfView.autoScales = true
                pdfView.displayDirection = .vertical // .horizontal//.vertical
                pdfView.document = pdfDocument
            
                pdfView.autoresizingMask = [.flexibleWidth, .flexibleHeight, .flexibleTopMargin, .flexibleBottomMargin]
                pdfView.zoomIn(self)
                pdfView.autoScales = true
                pdfView.backgroundColor = UIColor.white

                //Imp line
                pdfView.usePageViewController(true, withViewOptions: [:])
                
                currentPageNumberOfPdf = self.pdfView.currentPage?.pageRef?.pageNumber ?? 0
                print("Total Pages in PDF : ",pdfDocument.pageCount);
                
                self.pdfView.bringSubviewToFront(customView1!)
            }
        }
        
    }

 @IBAction func addSignatoryButtonClicked(_ sender: Any) {
        
        signatoryCount = signatoryCount + 1
        
        if signatoryCount == 1 {
            customView1?.signatoryLabel.text = "Signatory \(signatoryCount)"
            self.pdfView.addSubview(customView1!)
        }
        else  if signatoryCount == 2 {
            customView2?.signatoryLabel.text = "Signatory \(signatoryCount)"
            self.pdfView.addSubview(customView2!)
        }
        else  if signatoryCount == 3 {
            customView3?.signatoryLabel.text = "Signatory \(signatoryCount)"
            self.pdfView.addSubview(customView3!)
        }
        else  if signatoryCount == 4 {
            customView4?.signatoryLabel.text = "Signatory \(signatoryCount)"
            self.pdfView.addSubview(customView4!)
        }
        else  if signatoryCount == 5 {
            customView5?.signatoryLabel.text = "Signatory \(signatoryCount)"
            self.pdfView.addSubview(customView5!)
        }
    }
    

    
    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        
        let touch = touches.first
        let touchLocation = touch?.location(in: self.pdfView)
       // customView1?.center =  touchLocation!
       
        
        if signatoryCount == 1 {
            customView1?.center = touchLocation!
            return
        }
        else  if signatoryCount == 2 {
            customView2?.center = touchLocation!
            return
        }
        else  if signatoryCount == 3 {
            customView3?.center = touchLocation!
            return
        }
        else  if signatoryCount == 4 {
            customView4?.center = touchLocation!
            return
        }
        else  if signatoryCount == 5 {
           customView5?.center = touchLocation!
           return
        }
    
       // frame = view.convert(customView1!.frame, from: pdfView)
       // print("touchesMoved \(frame!.dictionaryRepresentation)")
    
    }

Here is the complete project source code

Answer 1

你已经很接近了。您只需要应用我在last question 中建议的方法，但要尊重超级视图的框架。

首先将这些助手添加到您的项目中：

---

extension  CGPoint {
    static func +(lhs: CGPoint, rhs: CGPoint) -> CGPoint {
        .init(x: lhs.x + rhs.x, y: lhs.y + rhs.y)
    }
    static func +=(lhs: inout CGPoint, rhs: CGPoint) {
        lhs.x += rhs.x
        lhs.y += rhs.y
    }
}

---

extension UIView {
    func translate(_ translation: CGPoint) {
        let destination = center + translation
        let minX = frame.width/2
        let minY = frame.height/2
        let maxX = superview!.frame.width-minX
        let maxY = superview!.frame.height-minY
        center = CGPoint(
            x: min(maxX, max(minX, destination.x)),
            y: min(maxY ,max(minY, destination.y)))
    }
}

---

其次，只需摆脱平移手势识别器和 ViewController 中的对应方法。

第三次将您的 SignatoryXibView 平移手势更改为下面的手势。这将平移视图的中心并尊重其父视图的框架：

@objc func pan(_ gesture: UIPanGestureRecognizer) {
    translate(gesture.translation(in: self))
    gesture.setTranslation(.zero, in: self)
    setNeedsDisplay()
}

sample project