iOS

Question

我正在慢慢学习 Apple 的 Swift 学习开发，我一直运行遇到我的点击手势问题。我已经重新创建了所有项目编号，结果相同。

我向图像视图添加了点击手势，这应该可以从我的计算机打开照片库。没有任何反应。

当我从 Apple 下载并运行示例文件时，一切正常。当我将 Apple 的代码复制并粘贴到我的代码时，同样没有任何反应。我已经尽我所能，但我觉得我错过了一些东西。

这是我的代码。苹果代码如下：

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 fields user input through delegate callbacks
        nameTextField.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) {
        mealNameLabel.text = textField.text
    }

    // MARK: UIImagePickerControllerDelegate

    func imagePickerControllerDidCancel(picker: UIImagePickerController) {
        // dismiss the picker if user cancels
        dismissViewControllerAnimated(true, completion: nil)
    }

    func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
        // The info dictionary contains multiple representations of the image, and this uses the original.
        let selectedImage = info[UIImagePickerControllerOriginalImage] as! UIImage

        // Set the photoviewimage to be the selected image
        photoImageView.image = selectedImage

        // Dismiss the picker
        dismissViewControllerAnimated(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 pictures to be selected and not taken
        imagePickerController.sourceType = .PhotoLibrary

        // make sure the viewcontroller is notified when the user selects an image
        imagePickerController.delegate = self

        presentViewController(imagePickerController, animated: true, completion: nil)

    }

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

}

这是 Apple 的代码：

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.
        dismissViewControllerAnimated(true, completion: nil)
    }

    func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
        // The info dictionary contains multiple representations of the image, and this uses the original.
        let selectedImage = info[UIImagePickerControllerOriginalImage] as! UIImage

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

        // Dismiss the picker.
        dismissViewControllerAnimated(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

        presentViewController(imagePickerController, animated: true, completion: nil)
    }

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

}

Anbu 的工作代码

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() {
        let tapgesture = UITapGestureRecognizer(target: self, action: Selector("imagepressed"))
        photoImageView.userInteractionEnabled = true
        photoImageView.addGestureRecognizer(tapgesture)

        super.viewDidLoad()

        // handle the text fields user input through delegate callbacks
        nameTextField.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) {
        mealNameLabel.text = textField.text
    }

    // MARK: UIImagePickerControllerDelegate

    func imagePickerControllerDidCancel(picker: UIImagePickerController) {
        // dismiss the picker if user cancels
        dismissViewControllerAnimated(true, completion: nil)
    }

    func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
        // The info dictionary contains multiple representations of the image, and this uses the original.
        let selectedImage = info[UIImagePickerControllerOriginalImage] as! UIImage

        // Set the photoviewimage to be the selected image
        photoImageView.image = selectedImage

        // Dismiss the picker
        dismissViewControllerAnimated(true, completion: nil)
    }

    // MARK: Actions


    func imagepressed () {
        nameTextField.resignFirstResponder()

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

        // Only Allow pictures to be selected and not taken
        imagePickerController.sourceType = .PhotoLibrary

        // make sure the viewcontroller is notified when the user selects an image
        imagePickerController.delegate = self

        presentViewController(imagePickerController, animated: true, completion: nil)
    }



/*    @IBAction func selectImageFromPhotoLibrary(sender: UITapGestureRecognizer) {
        let tapgesture = UITapGestureRecognizer(target: self, action: Selector("imagepressed"))
        photoImageView.userInteractionEnabled = true
        photoImageView.addGestureRecognizer(tapgesture)

        // 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 pictures to be selected and not taken
        imagePickerController.sourceType = .PhotoLibrary

        // make sure the viewcontroller is notified when the user selects an image
        imagePickerController.delegate = self

        presentViewController(imagePickerController, animated: true, completion: nil)

    }
   */

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

}

Answer 1

喜欢

The reason ,by default the UIImageview userInteraction is false, so you need to enable manually

第一步

let tapGesture = UITapGestureRecognizer(target:self, action:Selector("imagePressed"))
photoImageView.userInteractionEnabled = true // this line is important
photoImageView.addGestureRecognizer(tapGesture)

第 2 步

func imagePressed()
{
//do  Your action here  whatever you want 
}

Answer 2

您在哪里添加了图像视图的 UITapGestureRecognizer？如果您将它添加到 Storyboard 中，是否已将它连接到选择器 selectImageFromPhotoLibrary:?

Answer 3

我发现解决问题的最简单方法是在图像视图的属性编辑器中单击显示 "User Interaction Enabled" 的复选框。 Screenshot

Answer 4

您的代码非常好。问题出在故事板中的 UIImageView 上。 user interaction 选项未选中。

所以你只需要在故事板中启用这个选项。

转到故事板。
Select 你的 UIImageView（你把它命名为 photoimageview）
现在在“Attribute Inspector”中寻找user interaction enabled，应该是“checked”
现在运行你的项目可以工作了。

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