ios - 为什么数据没有在 View Controller 之间传递？ swift 3

一个视图控制器上有两个文本标签，我想将标签中的文本连接到另一个视图控制器上相应的uibutton和UILabels。
现在，当我按下“thisUploadPhoto”按钮时，它会加载下一个屏幕的两个屏幕，而不是一个屏幕。如果你能帮我，那就太好了。另外，当我按下PhotoLabelViewController上的“完成”和“取消”按钮时，会出现以下错误：
由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“-[tot.PhotoShareLabelViewController didTapDone:]：发送到实例0x7f8cecf5d0b0的未识别的选择器”
当它应该打印“完成”时
我不知道为什么下面的代码不能把两个视图控制器连接起来。

import UIKit

class PhotoShareViewController: UIViewController {
    @IBOutlet weak var imageView: UIImageView!
    @IBOutlet weak var contentTextView: UITextView!

    @IBOutlet weak var thatTextField: UITextField!
    @IBOutlet weak var thisTextField: UITextField!
    var presenter: PhotoShareModuleInterface!
    var image: UIImage!

    @IBAction func thisUploadPhoto(_ sender: Any) {
        if thisTextField.text != "" && thatTextField.text != ""
        {
            performSegue(withIdentifier: "segue", sender: self)
        }
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        var photoShareLabelViewController = segue.destination as! PhotoShareLabelViewController
        photoShareLabelViewController.thisString = thisTextField.text!
        photoShareLabelViewController.thatString = thatTextField.text!
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        imageView.image = image
    }

    override var prefersStatusBarHidden: Bool {
        return true
    }

    @IBAction func didTapCancel(_ sender: AnyObject) {
        presenter.cancel()
        presenter.pop()
    }

    @IBAction func didTapDone(_ sender: AnyObject) {
        guard let message = thatTextField.text, !message.isEmpty else {
            return
        }
        guard let messageOne = thisTextField.text, !messageOne.isEmpty else {
            return
        }

        presenter.finish(with: image, content:message)
        presenter.dismiss()
    }
}

extension PhotoShareViewController: PhotoShareViewInterface {
    var controller: UIViewController? {
        return self
    }
}

import UIKit

class PhotoShareLabelViewController: UIViewController {
    @IBOutlet weak var thisLabel: UILabel!
    @IBOutlet weak var thatLabel: UILabel!
    @IBOutlet weak var thisButton: UIButton!
    @IBOutlet weak var thatButton: UIButton!

    var thisCounter = 0
    var thatCounter = 0
    var presenter: PhotoShareModuleInterface!
    var image: UIImage!

    @IBAction func pressedThisButton(_ sender: Any) {
        thisCounter += 1

        print(thisCounter)
    }

    @IBAction func pressedThatButton(_ sender: Any) {
        thatCounter += 1

        print(thatCounter)
    }

    var thisString = String()
    var thatString = String()

    @IBAction func pressedButtonDone(_ sender: Any) {
        print("done")
    }

    @IBAction func pressedButtonCancel(_ sender: Any) {
        print("cancel")
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        thisLabel.text = thisString
        thisButton.setTitle(thisString, for: UIControlState.normal)
        thatLabel.text = thatString
        thatButton.setTitle(thatString, for: UIControlState.normal)
    }

}

最佳答案

“Done”按钮从故事板连接到调用didTapDone中名为PhotoShareLabelViewController的方法。但是，您的didTapDone方法是在PhotoShareViewController中实现的。它是一个不同的视图控制器。
要解决此问题，请将方法实现放在正确的视图控制器中。然后，在情节串连板中选择“完成”按钮，转到其“连接检查器”[见下图]并删除其当前错误连接。然后，将其连接到正确视图控制器中的正确didTapDone方法。

关于ios - 为什么数据没有在 View Controller 之间传递？ swift 3，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45574754/