感到无法在Xcode模拟器中使用（苹果官方教程“ FoodTracker”）

Question

我正在研究Apple的官方教程，以学习iOS。

但是我做了同样的事情，但是触摸在模拟器中不起作用。

我尝试关闭并打开Xcode并复制并粘贴示例文件，但它仍然没有碰到。还是您还应该尝试其他方法？

我需要帮助。

import UIKit

class ViewController: UIViewController, UITextFieldDelegate,UIImagePickerControllerDelegate,UINavigationControllerDelegate {


    // MARK: Properties
    @IBOutlet weak var nameTextField: UITextField!
    @IBOutlet weak var mealNameLabel: UILabel!
    @IBOutlet weak var photoimageView: UIImageView!


    override func viewDidLoad() {
        super.viewDidLoad()

        // Handle the text field’s user input through delegate callbacks.
        nameTextField.delegate = self
    }
    //MARK: UITextFieldDelegate
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {

        // Hide the keyboard.
        textField.resignFirstResponder()
        return true
    }
    func textFieldDidEndEditing(_ textField: UITextField) {
        mealNameLabel.text = textField.text
    }

    //MARK: UIImagePickerControllerDelegate
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {

        // Dismiss the picker if the user canceled.
        dismiss(animated: true, completion: nil)
    }
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

        // The info dictionary may contain multiple representations of the image. You want to use the original.
        guard let selectedImage = info[UIImagePickerController.InfoKey.originalImage] as?
            UIImage else {
                fatalError("Expected a dictionary containing an image, but was provided folowing: \(info)")
        }
        // Set photoImageView to display the selected image.
        photoimageView.image = selectedImage

        // dismiss picker
        dismiss(animated: true, completion: nil)
    }

    // MARK: Actions
    @IBAction func selectImageFromPhotoLibrary(_ sender: UITapGestureRecognizer) {

        // Hide the keyboard.
        nameTextField.resignFirstResponder()

        // UIImagePickerController is a view controller that lets a user pick media from their photo library.
        let imagePickerController = UIImagePickerController()

        // Only allow photos to be picked, not taken.
        imagePickerController.sourceType = .photoLibrary

        // Make sure ViewController is notified when the user picks an image.
        imagePickerController.delegate = self
        present(imagePickerController, animated: true, completion: nil)
    }

    @IBAction func setDefaultLabelText(_ sender: UIButton) {
        mealNameLabel.text = "Default Text"
    }
}

Answer 1

您应将isUserInteractionEnabled与Storyboard一起添加为true，并添加Tap Gesture Recognizer并与Storyboard链接（或更新此链接）@IBAction func selectImageFromPhotoLibrary