如何使用更新后的 UIImagePickerControllerDelegate iOS 12 API？

Question

我如何使用更新后的 UIImagePickerControllerDelegate API，因为它已更改为 [UIIMagePickerController.InfoKey : Any]？这部分已经更新。我也在这里搜索，没有找到答案。

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

其实并没有什么不同。在 iOS 12 中，许多旧常量名称已被重构。

您现在使用 UIImagePickerController.InfoKey.originalImage:

而不是旧密钥 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：

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

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)
}

Answer 2

您需要使用 UIImagePickerController 的 availableMediaTypes class 函数设置选取器的 mediaTypes 并检索实际图像来自 info 参数。

@IBAction func botaoAdcFoto(_ sender: UIButton) {
        picker.allowsEditing = true
        picker.delegate = self
        picker.sourceType = .photoLibrary
        if let mediaTypes = UIImagePickerController.availableMediaTypes(for: .photoLibrary) {
          picker.mediaTypes = mediaTypes
        }

        present(picker, animated: true)
    }

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

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

如何使用更新后的 UIImagePickerControllerDelegate iOS 12 API？

How do I use the updated UIImagePickerControllerDelegate iOS 12 API?

ios

swift

uiimagepickercontroller

ios12