如何使用更新的 UIImagePickerControllerDelegate iOS 12 API？

Question

我如何使用更新后的UIImagePickerControllerDelegateAPI，因为它更改为[UIIMagePickerController.InfoKey : Any]？这部分已经更新。我也在这里搜索过，但找不到答案。

import UIKit

class adicionarNovoItemVc: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    @IBOutlet weak var textFieldNome: UITextField!
    let imagePicker = UIImagePickerController()
    @IBOutlet weak var namePreview: UILabel!
    @IBOutlet weak var imagePreview: UIImageView!
    let picker = UIImagePickerController()

    @IBAction func botaoAdcFoto(_ sender: UIButton) {
        picker.allowsEditing = true
        picker.delegate = self
        present(picker, animated: true)
    }

    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        dismiss(animated: true)
    }

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

更新：

将didFinishPickingMediaWithInfo委托更新为：

private func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let image = info[.originalImage] as! UIImage? {
        self.imagePreview.image = image

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

我现在得到：

无法从“切片>”向下转换为更可选的类型“UIImage？”

Answer 1

这并没有太大的不同。在 iOS 12 中，许多旧的常量名称已被重构。

UIImagePickerControllerOriginalImage您现在使用的不是旧密钥UIImagePickerController.InfoKey.originalImage：

就像是：

let image = info[UIImagePickerControllerOriginalImage]

现在变成：

let image = info[.originalImage]

请参阅UIImagePickerController.InfoKey的相关文档。

更新：

您在尝试中犯了几个错误didFinishPickingMediaWithInfo。你需要：

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
    if let image = info[.originalImage] as? UIImage {
        self.imagePreview.image = image
    }

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