swift - 我该如何修复此错误 - 无法将以下代码中类型 'UIImageView' 的值转换为预期参数类型 'UIImage'

Question

import UIKit

class UserVC: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    @IBOutlet weak var userImagePicker: UIImageView!
    @IBOutlet weak var usernameField: UITextField!
    @IBOutlet weak var completeSignInBtn: UIButton!

    var userUid: String!
    var emailField: String!
    var passwordField: String!
    var imagePicker: UIImagePickerController!
    var imageSelected = false
    var username: String!

    func uploadImg() {
        if usernameField.text == nil {
            print("Must have username")
            completeSignInBtn.isEnabled = false
        }else {
            username = usernameField.text
            completeSignInBtn.isEnabled = true
        }
        guard let img = userImagePicker, imageSelected == true else {
            print("image must be selected")
            return
        }

        // below is where the error is can you help me? 
        if let imgData = UIImageJPEGRepresentation(img, 0.2) {
            let imgUid = NSUUID().uuidString
            let metadata = StorageMetadata()
            metadata.contentType = "img/jpeg"

            Storage.storage().reference().child(imgUid).put(imgData, metadata: metadata) {
                (Metadata, error) in
                if error != nil {
                    print("did not upload image")
                }else {
                    print("uploaded")
                    //
                }
            }
        }
    }
}

我不知道如何修复此错误。如果有人可以提供帮助，我将不胜感激。

Answer 1

正如我从导出看到的 userImagePicker 是 UIImageView 而不是 UIImage

因此，为了解决这个问题，我建议通过以下方式从 View 中获取图像:

更改此行

guard let img = userImagePicker, imageSelected == true else {

到此

guard let img = userImagePicker.image, imageSelected == true else {

假设从 UIImagePickerController 中选取图像后加载该图像以进行查看