swift - 使用 UIImagePicker 在 UIImageView 中设置图像

Question

这就是我的代码目前的样子。我期望发生的是 profileImage (UIImageView) 来显示所选图像，因为它当前没有发生。

import UIKit

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

@IBOutlet var profileImage: UIImageView!

let picker = UIImagePickerController()

override func viewDidLoad() {
        super.viewDidLoad()

        picker.delegate = self
        picker.sourceType = .photoLibrary
}


    @IBAction func photoUploadPressed(_ sender: Any) {

        if UIImagePickerController.isSourceTypeAvailable(.photoLibrary){
            let myPickerController = UIImagePickerController()
            myPickerController.delegate = self;
            myPickerController.sourceType = .photoLibrary
            self.present(myPickerController, animated: true, completion: nil)

    }


    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        if let image = info[UIImagePickerController.InfoKey.originalImage] as? UIImage{
            selectedImage = image
            profileImage.image = image
        }
        dismiss(animated: true, completion: nil)
    }

}

目前图像选择器出现，但一旦选择它不会改变 UIImageView 的图像。

任何帮助都感激不尽。

Answer 1

它按预期工作，您的代码中唯一的错误是您缺少 }photoUploadPressed(_ sender: Any)并且您没有声明 selectedImage 并在里面使用它imagePickerController

工作代码

import UIKit

class ViewController: UIViewController , UIImagePickerControllerDelegate, UINavigationControllerDelegate{
let picker = UIImagePickerController()

    var selectedImage: UIImage?
    @IBOutlet weak var profileImage: UIImageView!
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.

        picker.delegate = self
        picker.sourceType = .photoLibrary
    }

    @IBAction func potoUploadPressed(_ sender: Any) {
        if UIImagePickerController.isSourceTypeAvailable(.photoLibrary){
                   let myPickerController = UIImagePickerController()
                   myPickerController.delegate = self;
                   myPickerController.sourceType = .photoLibrary
                   self.present(myPickerController, animated: true, completion: nil)
        }// It is missing in your code

    }


    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
           if let image = info[UIImagePickerController.InfoKey.originalImage] as? UIImage{
               selectedImage = image // You have not declared selectedImage
               profileImage.image = image
           }
           dismiss(animated: true, completion: nil)
       }

}