Question

所以我是iOS开发的新手，我终于走到了这一步：https://developer.apple.com/library/content/referencelibrary/GettingStarted/DevelopiOSAppsSwift/WorkWithViewControllers.html#//apple_ref/doc/uid/TP40015214-CH6-SW1

我一步一步地按照指南操作，出于某种原因，当我运行我的应用程序时，我点击了图像视图，没有弹出任何内容。我的代码与Apple的代码完全相同，但nameTextField为businessNameTextField和businessNameLabel除外。这是我的ViewController.swift文件

//
//  ViewController.swift
//  Example (Sample 1)
//
//  Created by lewlsaucengravy on 4/9/17.
//  Copyright © 2017 Example. All rights reserved.
//

import UIKit

class ViewController: UIViewController, UITextFieldDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    //MARK: Properties

    @IBOutlet weak var businessNameLabel: UILabel!
    @IBOutlet weak var businessTextField: UITextField!
    @IBOutlet weak var photoImageView: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        businessTextField.delegate = self
    }

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

    //MARK: UITextFieldDelegate

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        // Hide the keyboard.
        textField.resignFirstResponder()
        return true
    }

    func textFieldDidEndEditing(_ textField: UITextField) {
        businessNameLabel.text = textField.text
    }

    //MARK: UIImagePickerControllerDelegate
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        // Dismiss the picker if user cancelled.
        dismiss(animated: true, completion: nil)
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        // The info dictionary may contain multiple representations of the image. You want to use the original.
        guard let selectedImage = info[UIImagePickerControllerOriginalImage] as? UIImage else {
            fatalError("Expected a dictionary containing an image, but was provided the following: \(info)")
        }

        // Set photoImageView to display the selected image.
        photoImageView.image = selectedImage

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

    //MARK: Actions
    @IBAction func completeProfile(_ sender: UIButton) {
        businessNameLabel.text = "test"
    }

    @IBAction func selectImageFromPhotoLibrary(_ sender: UITapGestureRecognizer) {
            // Hide the keyboard.
            businessTextField.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)
    }

}

我的AppDelegate.swift文件是创建项目时的默认文件，因此无需显示任何内容。

这里是Main.storyboard：

我真的试图避免删除应用并重新开始，因为我想养成故障排除的习惯并了解我在这里做错了什么。

根据我的理解，如果我错了，请随时纠正我，当用户点击图片视图时，它会调用selectImageFromPhotoLibrary函数，我可以从中查看SQLCmd -S<<SERVERNAME\INSTANCENAME>> -Q "Execute dbo.YourStoredProcedure"函数。在动作下定义，一切都应该从那里开始。但是，我不确定我在这里失踪了什么，也不想重新开始。

修改

看起来问题可能是＆＃34;用户互动已启用＆＃34;复选框，我忘了检查。这是我发布问题后我唯一改变的事情，显然它现在正在工作。谢谢你的帮助！

Answer 1

确保选中了“启用用户交互”复选框：

Answer 2

根据我的想法，您没有在plist中设置以下参数：

关注iOS教程 - 无法显示图像选择器

2 个答案: