将文本输入文本字段，使uipangesture对象移回其原始位置

Question

bounty到期在2天内。该问题的答案有资格获得+ 50声望赏金。Mitch Mustain正在寻找来自信誉良好的来源的答案：

只需获取uiimageview即可使用uipangesutre以及在文本输入到文本字段中时移动。 imageview不会返回其原始位置。

下面的我的快速代码具有与手势相连的图像视图。在图像视图移动之后，当在文本字段中输入了某些内容时。图像视图恢复到其原始位置。gif表示发生了什么情况。我只是不希望在将文本输入到文本字段中之后将pangesutre的效果取消。

链接到GITHUB https://github.com/redrock34/sse

import UIKit

class ViewController: UIViewController {

    var pic = UIImageView()
    let fight = (0..<10).map { _ in UIImageView() }
    var textEnter = UITextField()
    var g2 = UIPanGestureRecognizer()

    var slider = UISlider()

    override func viewDidLoad() {
        super.viewDidLoad()

        fight[0].image  = UIImage(named: "a.png")

        fight.forEach{
            $0.isUserInteractionEnabled = true
        }
        [slider,textEnter].forEach{
            $0.translatesAutoresizingMaskIntoConstraints = false
            view.addSubview($0)

            $0.backgroundColor = .blue
        }

        slider.backgroundColor = .clear

        g2 = UIPanGestureRecognizer(target: self, action: #selector(ViewController.g1Method))
        fight[0].addGestureRecognizer(g2)

        pic.backgroundColor = .clear
        pic.backgroundColor = .systemGreen

        fight.forEach{
            $0.backgroundColor = .clear
            view.addSubview($0)
            $0.translatesAutoresizingMaskIntoConstraints = false
        }            

        [pic].forEach{

            view.addSubview($0)
            $0.translatesAutoresizingMaskIntoConstraints = false                
        }

        // Do any additional setup after loading the view.
        NSLayoutConstraint.activate ([

            pic.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant :0),
            pic.topAnchor.constraint(equalTo: fight[0].bottomAnchor, constant : 0),

            pic.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.62, constant: 0),
            pic.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant : 0),

            textEnter.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant :0),
            textEnter.topAnchor.constraint(equalTo: view.topAnchor, constant : 0),
            textEnter.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.1, constant: 0),
            textEnter.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant : 0),

            fight[0].trailingAnchor.constraint(equalTo: view.trailingAnchor, constant :0),
            fight[0].topAnchor.constraint(equalTo: textEnter.bottomAnchor, constant : 0),

            fight[0].heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.10, constant: 0),
            fight[0].widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 0.10, constant: 0),
            fight[0].leadingAnchor.constraint(equalTo: view.leadingAnchor, constant : 0),

            slider.topAnchor.constraint(equalTo: pic.bottomAnchor, constant : 0),

            slider.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.08, constant: 0),
            slider.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 1, constant: 0),
            slider.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant : 0),

        ])
        textEnter.textAlignment = .center

        self.view.sendSubviewToBack(pic)
    }

    @objc func g1Method(_ sender: UIPanGestureRecognizer){

        let tranistioon = sender.translation(in: self.view)
        sender.view!.center = CGPoint(x: sender.view!.center.x + tranistioon.x, y: sender.view!.center.y + tranistioon.y)
        sender.setTranslation(CGPoint.zero,in: self.view)    }
}

Answer 1

  var existingTransition : CGAffineTransform?
    @objc func g1Method(_ sender: UIPanGestureRecognizer){
        guard let child = sender.view else{return}
        let transitionPoint = sender.translation(in: self.view)
        let newTransition = CGAffineTransform(translationX: transitionPoint.x, y: transitionPoint.y)
        switch sender.state {
        case .ended,.cancelled:// on End
            if let existing = existingTransition{
                self.existingTransition = newTransition.concatenating(existing)
            }else{
                self.existingTransition = newTransition
            }
        default://on change and other states
            if let existing = existingTransition{
                child.transform = newTransition
                    .concatenating(existing)
            }else{
                child.transform = newTransition
            }
        }
        self.view.layoutIfNeeded()
    }

对不起，如果我的代码混乱。但是我检查了一些scenaios，它的工作正常。

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