如何在使用 UIImagePickerController 选择的 UIImageView 中显示图像？

Question

我是 Xcode 和 Swift 的新手，我试图在使用 UIImagePickerController 选择的 UIImageView 中显示图像。我使用@IBOutlet 链接了UIImageView，并在底部放置了一些if 语句以允许编辑所选图片，但是当我的代码中弹出错误时我被卡住了。我很确定问题与我引用UIImageView 的方式有关，但我不知道如何以不同的方式进行。我刚注册了这个账号来问这个问题，所以请原谅我发这个帖子的方式。

代码如下：

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func openPhotosButton(_ sender: UIButton) {
        showImagePickerController()
    }

    @IBOutlet weak var characterView: UIImageView!

}

extension ViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    func showImagePickerController() {
        let imagePickerController = UIImagePickerController()
        imagePickerController.delegate = self
        imagePickerController.allowsEditing = true
        imagePickerController.sourceType = .photoLibrary
        present(imagePickerController, animated: true)
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

        if let editedImage = info[UIImagePickerController.InfoKey.editedImage] as UIImage {
            characterView.image = editedImage
        }
        else if let originalImage = info[UIImagePickerController.InfoKey.originalImage] as UIImage {
            characterView.image = originalImage
        }

        dismiss(animated: true)
    }
}

图片来自 Xcode：

Answer 1

把你的方法改成这个

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

        if let editedImage = info[UIImagePickerController.InfoKey.editedImage] as? UIImage {
            characterView.image = editedImage
        }
        else if let originalImage = info[UIImagePickerController.InfoKey.originalImage] as? UIImage {
            characterView.image = originalImage
        }

        dismiss(animated: true)
    }