讓可拖動的UIImage移回原點位置

Question

編輯：我能夠以某種方式更改代碼，程序不再崩潰。 但是，代碼仍然只有一個小問題：

正如您在我的控制台輸出中看到的那樣，origin2的坐標與原點1中的坐標不同。

origin1：（268.0,241.0）origin2：（116.0,323.0）sender view center：可選（（146.5,397.0））

所以我需要從viewDidLoad（）獲取imageOrigin1值並使用它們im func handlePan（sender：UIPanGestureRecognizer）。 我只是不知道該怎么做......

import UIKit

class ViewController: UIViewController {


    @IBOutlet weak var image: UIImageView!
    @IBOutlet weak var correctField: UIImageView!

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.

    }

    override func viewDidLoad() {
        super.viewDidLoad()

        let imageOrigin1 = image.frame.origin

        print("origin1: \(imageOrigin1)")
    }

    @IBAction func handlePan(sender:UIPanGestureRecognizer) {

        let imageOrigin2 = image.frame.origin

        let translation = sender.translationInView(self.view)

        if let view = sender.view {
            view.center = CGPoint(x:view.center.x + translation.x,
                                  y:view.center.y + translation.y)
        }

        if sender.state == UIGestureRecognizerState.Ended {

            if correctField.frame.contains(sender.view!.center){
                print("Correct")
                sender.setTranslation(CGPointZero, inView: self.view)
            } else{
                    print("origin2: \(imageOrigin2)")
                    print("sender view center: \(sender.view?.center)")
                //sender.view?.center = imageOrigin
            }
        }
    }
}

Answer 1

我自己解決了這個問題，添加了一個新類並通過set和get方法傳遞變量：

類：

import UIKit

class Origin {

var positionOrigin: CGPoint!

    func setImageOrigin(Image: UIImageView) {
        positionOrigin = Image.center
    }

    func getImageOrigin() -> CGPoint {
        return positionOrigin
    }
}

查看控制器：

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var correctField: UIImageView!
    @IBOutlet weak var image: UIImageView!

    var imageOrigin = Origin()

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.

    }

    override func viewDidLoad() {
        super.viewDidLoad()

        imageOrigin.setImageOrigin(image)

    }

    @IBAction func handlePan(sender:UIPanGestureRecognizer) {

        let translation = sender.translationInView(self.view)

        if let view = sender.view {
            view.center = CGPoint(x:view.center.x + translation.x,
                                  y:view.center.y + translation.y)
            sender.setTranslation(CGPointZero, inView: self.view)

        }

        if sender.state == UIGestureRecognizerState.Ended {

            if correctField.frame.contains(sender.view!.center){
                print("Correct")

            } else{

                image.center = imageOrigin.getImageOrigin()

            }
        }
    }
}