從子視圖復制對象然后放置對象

Question

我希望我的 swift 代碼復制棕色視圖的對象。 所以用戶點擊復制按鈕，然后用戶點擊他們想要復制的對象，然后他們指向他們想要放置對象的區域。 基本上下面的 gif 正是我所看到的，我不知道你是否會做類似這樣的事情的克隆。

import UIKit;import CoreData

class ViewController: UIViewController {
    
    var addBoxes = [UIImageView]()
    let subview = UIImageView()
    var currentView: UIView?
    
    var box = UIButton()
    
    var copyButton = UIButton()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        [box,copyButton].forEach {
            $0.translatesAutoresizingMaskIntoConstraints = false
            view.addSubview($0)
        }
        
        box.backgroundColor = .red
        
        box.setTitle("Add", for: .normal)
        
        copyButton.setTitle("Copy", for: .normal)
        
        NSLayoutConstraint.activate([
        
        box.leadingAnchor.constraint(equalTo: copyButton.trailingAnchor),
        box.bottomAnchor.constraint(equalTo: view.bottomAnchor),
        box.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.04),
        box.widthAnchor.constraint(equalTo:view.widthAnchor ,multiplier: 0.5),
        
        copyButton.leadingAnchor.constraint(equalTo: view.leadingAnchor),
        copyButton.bottomAnchor.constraint(equalTo: view.bottomAnchor),
        copyButton.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.04),
        copyButton.widthAnchor.constraint(equalTo:view.widthAnchor ,multiplier: 0.5),
        
        
        ])
        
        copy.addTarget(self, action: #selector(copyBox), for: .touchDown)
        box.addTarget(self, action: #selector(addQuarter), for: .touchDown)
        
        
        copyButton.backgroundColor = .blue
        
    }

    override var prefersStatusBarHidden: Bool {
        return true
    }
    
    @objc func copyBox() {
        
    }
    
    @objc func handlePanGestured(_ gesture: UIPanGestureRecognizer) {
        currentView = gesture.view
        
        let draggedView = gesture.view!
        view.bringSubviewToFront(draggedView)
        
        let translation = gesture.translation(in: view)
        draggedView.center = CGPoint(x: draggedView.center.x + translation.x, y: draggedView.center.y + translation.y)
        gesture.setTranslation(.zero, in: view)
    }

    @objc func addQuarter(){
        
        let subview = UIImageView()
        
        subview.isUserInteractionEnabled = true
        addBoxes.append(subview)
        view.addSubview(subview)
        
        let pan = UIPanGestureRecognizer(target: self, action: #selector(handlePanGestured(_:)))
        
        subview.addGestureRecognizer(pan)
     
        subview.frame = CGRect(x: view.bounds.midX , y: view.bounds.midY + CGFloat(100), width: CGFloat(100), height: 100)
        subview.backgroundColor = .brown
        
        addBoxes.append(subview)
        
    }
}

Answer 1

一種實現copy 。

您可以在Model級別執行此操作。

在您的情況下，要復制 View，就是獲取 View 屬性（ Frame Size, Color ），

然后創建一個新的。

---

這是代碼說明

模型部分

// you can add info , in your needs
struct ViewModel{
     let color: UIColor
     let size: CGSize
}

邏輯部分：

添加一個UITapGestureRecognizer到基礎視圖（添加部件視圖）

在復制模式下，視圖是isUserInteractionEnabled false，

在添加模式下，視圖isUserInteractionEnabled true，

var selectModel: ViewModel?


@objc func copyBox() {

    
    // now in the copy mode
}


func selectView(){
      // get current model
      selectModel = ViewModel(color: yourView.backgroundColor, size: yourView.frame.size)
}


@objc func AddBox() {

    
    // now in the add mode / paste mode
}


func touchToAdd(_ gesture: UITapGestureRecognizer){
     // get the tap location,
     // the location point is the new view's center

     //  use the model from `func selectView(){`

     //  now you got center . frame size 、color， enough to create a new one ( a copy)
}

Answer 2

用代碼實現你的要求

class ViewController: UIViewController {

var addBoxes = [UIImageView]()
let subview = UIImageView()
var currentView: UIView?
var location: CGPoint = CGPoint.zero

var box = UIButton()

var copyButton = UIButton()

override func viewDidLoad() {
    super.viewDidLoad()
    [box,copyButton].forEach {
        $0.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview($0)
    }
    
    box.backgroundColor = .red
    
    box.setTitle("Add", for: .normal)
    
    copyButton.setTitle("Copy", for: .normal)
    
    NSLayoutConstraint.activate([
    
    box.leadingAnchor.constraint(equalTo: copyButton.trailingAnchor),
    box.bottomAnchor.constraint(equalTo: view.bottomAnchor),
    box.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.04),
    box.widthAnchor.constraint(equalTo:view.widthAnchor ,multiplier: 0.5),
    
    copyButton.leadingAnchor.constraint(equalTo: view.leadingAnchor),
    copyButton.bottomAnchor.constraint(equalTo: view.bottomAnchor),
    copyButton.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.04),
    copyButton.widthAnchor.constraint(equalTo:view.widthAnchor ,multiplier: 0.5),
    
    
    ])
    
    copyButton.addTarget(self, action: #selector(copyBox), for: .touchDown)
    box.addTarget(self, action: #selector(addQuarter), for: .touchDown)
    
    
    copyButton.backgroundColor = .blue
    
    self.view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleTapGestured(_:))))
    
}

override var prefersStatusBarHidden: Bool {
    return true
}

@objc func copyBox() {
    if let copyObject = currentView?.copyView as? UIImageView{
        copyObject.center = location
        copyObject.addGestureRecognizer(UIPanGestureRecognizer(target: self, action: #selector(handlePanGestured(_:))))
        view.addSubview(copyObject)
    }
}

@objc func handlePanGestured(_ gesture: UIPanGestureRecognizer) {
    currentView = gesture.view
    
    let draggedView = gesture.view!
    view.bringSubviewToFront(draggedView)
    
    let translation = gesture.translation(in: view)
    draggedView.center = CGPoint(x: draggedView.center.x + translation.x, y: draggedView.center.y + translation.y)
    gesture.setTranslation(.zero, in: view)
}

@objc func handleTapGestured(_ gesture: UITapGestureRecognizer) {
    if self.view == gesture.view{
        let loc = gesture.location(in: self.view)
        location = loc
    }
}

@objc func addQuarter(){
    
    let subview = UIImageView()
    
    subview.isUserInteractionEnabled = true
    addBoxes.append(subview)
    view.addSubview(subview)
    
    let pan = UIPanGestureRecognizer(target: self, action: #selector(handlePanGestured(_:)))
    subview.addGestureRecognizer(pan)
 
    subview.frame = CGRect(x: view.bounds.midX , y: view.bounds.midY + CGFloat(100), width: CGFloat(100), height: 100)
    subview.backgroundColor = .brown
    
    addBoxes.append(subview)
    
}
}

extension UIView{
var copyView : UIView?{
    if let archiv = try? NSKeyedArchiver.archivedData(withRootObject: self, requiringSecureCoding: false){
        if let view = try? NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(archiv) as? UIView{
            return view
        }
    }
    return nil
}
}