ios - 如何使用更新的 UIImagePickerControllerDelegate iOS 12 API？

Question

我如何使用更新后的 UIImagePickerControllerDelegate API，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:

更新 didFinishPickingMediaWithInfo 委托(delegate)后:

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:

Cannot downcast from 'Slice>' to a more optional type 'UIImage?'

Answer 1

其实并没有太大区别。在 iOS 12 中，许多旧常量名称已被重构。

您现在使用 UIImagePickerController.InfoKey.originalImage 而不是旧键 UIImagePickerControllerOriginalImage:

类似于:

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 didFinishPickingMediaWithInfo 时犯了几个错误。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)
}