UIImagePickerControllerDelegate 未被调用，所选图像从未显示

Posted 2023-03-11

【中文标题】UIImagePickerControllerDelegate 未被调用，所选图像从未显示

【英文标题】：UIImagePickerControllerDelegate not being called, selected image never displayed

【发布时间】：2021-05-14 13:53:44

【问题描述】：

我被难住了。一切正常，但不是。我可以调用相机界面并拍摄或选择一张照片，但 UIImagePickerControllerDelegate 从未被调用（我已经很好地放置了两个打印语句，永远不会被打印）。一切都在 IB 中正确连接，或者我相信它是正确的（我已经为它做好了充分的准备，所以我错过了一些完全次要的东西）。有谁愿意用一双漂亮的眼睛仔细检查一下，看看我是不是只见树木不见森林？

提前致谢。

import UIKit
import Foundation


class afterPhotoViewController: UIViewController 

    //MARK: - IBOutlet Properties
    @IBOutlet weak var afterImageView: UIImageView!
    @IBOutlet weak var aftervwImage: UIView!
    
    @IBOutlet weak var cameraBtnPressed: UIButton!
    
    //MARK: - Useful Variables
    let afterImagePicker = UIImagePickerController()
    var hud = HKProgressHUD()
    var localTextFilePath : URL!
    var isImageSetted = false

    //MARK: - App Delegates
    var isMain = false
    var originFrame = CGRect()
    override func viewDidLoad() 
        super.viewDidLoad()

        // Init UI Components
        self.initUI()
    
    

    override func didReceiveMemoryWarning() 
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    
    
    //MARK: - UI Init
    func initUI() 
        // Set Navigation Bar
        let backButton = UIBarButtonItem(title: "", style: .plain, target: navigationController, action: nil)
        navigationItem.leftBarButtonItem = backButton
        self.title = "\(h_proposalNumberStr)-\(h_itemIndex)"
        
        // Set ImageView
        self.afterImageView.image = #imageLiteral(resourceName: "ic_placeholder")
        self.afterImageView.clipsToBounds = false
        
        
        cameraBtnPressed.layer.cornerRadius = 15
        cameraBtnPressed.layer.borderColor = UIColor.lightGray.cgColor
        cameraBtnPressed.layer.borderWidth = 1
        
        self.isImageSetted = false
        
       // self.tableView.reloadData()
        
    
    
    //MARK: - UI Actions
    @IBAction func cameraBtnPressed(_ sender: Any) 
        //Create the AlertController and add Its action like button in Actionsheet
        let actionSheetController: UIAlertController = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
        
        let cancelActionButton = UIAlertAction(title: "Cancel", style: .cancel)  _ in
        
        actionSheetController.addAction(cancelActionButton)
        
        let chooseLibraryActionButton = UIAlertAction(title: "Choose from Library", style: .default)
         _ in
            self.isMain = true
            self.afterImagePicker.allowsEditing = true
            self.afterImagePicker.sourceType = .photoLibrary
            self.afterImagePicker.mediaTypes = UIImagePickerController.availableMediaTypes(for: .photoLibrary)!
            self.present(self.afterImagePicker, animated: true, completion: nil)
        
        actionSheetController.addAction(chooseLibraryActionButton)
        
        let takePhotoActionButton = UIAlertAction(title: "Take a Photo", style: .default)
         _ in
            if UIImagePickerController.isSourceTypeAvailable(.camera) 
                self.isMain = true
                self.afterImagePicker.allowsEditing = false
                self.afterImagePicker.sourceType = .camera
                self.afterImagePicker.mediaTypes = UIImagePickerController.availableMediaTypes(for: .camera)!
                self.afterImagePicker.showsCameraControls = true
                self.present(self.afterImagePicker, animated: true, completion: nil)
             else 
                Helper.showMessage(vc: self, title: CONSTANTS.APPINFO.APP_NAME, bodyStr: "No camera available.")
            
        
        actionSheetController.addAction(takePhotoActionButton)
        
        self.present(actionSheetController, animated: true, completion: nil)
    
   
    
//MARK: - UIImagePickerControllerDelegate
extension afterPhotoViewController: UIImagePickerControllerDelegate,UINavigationControllerDelegate 
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) 
        print("called")
        dismiss(animated: true, completion: nil)
    

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) 
        print("called2")
        //getting actual image
        var image = info[UIImagePickerControllerEditedImage] as? UIImage

        if image == nil 
            image = info[UIImagePickerControllerOriginalImage] as? UIImage
        

            afterImageView.image = image
            // Set Imageview Corner Radius
            afterImageView.layer.cornerRadius = 5
            afterImageView.clipsToBounds = true

            self.isImageSetted = true

        picker.dismiss(animated: true, completion: nil)
    

【问题讨论】：

未设置委托。在 viewDidLoad() 中设置 afterImagePicker.delegate = self

呃，插入大量 ::facepalm::

【参考方案1】：

@raja Kishan 发现了我忘记设置委托的愚蠢简单错误。

现在，手掌表情符号在哪里。

【参考方案2】：

您必须指定UIImagePickerController 的委托是self，以便触发事件。

在你的情况下：

afterImagePicker.delegate = self