ios - 如何将可选的 UIImage 附加到数组

Question

我有一个带有 2 个 UITextFields 和 1 个 UIImageView 的 UIViewController(图像是可选的)当我单击 Save 时，我想将所有值保存在一个对象数组中。但图像 (selectedImage) 不是强制性的。问题出在 UIImage 上，因为如果我没有图像，它会要求我提供 UIImage 的 optional 值。而且我不知道要分配什么，因为如果用户没有选择图片，我不想在我的数组中有任何图像。我尝试输入 NIL 值，但不起作用。

这是我的模型代码:

import Foundation
import UIKit

class RoadsideDefect {

    var vehicleReg: String
    var detailsDefect: String
    var imagesDefect: [UIImage]?

    init(vehicleRegistration: String, detailsOfDefect: String, imagesOfDefects: [UIImage]?) {

        self.vehicleReg = vehicleRegistration
        self.detailsDefect = detailsOfDefect
        self.imagesDefect = imagesOfDefects
    }
}

Controller 中的代码如下:

var vehicleReg = ""
var detailsDefect = ""
var imagesDefect: [UIImage]? = [UIImage]()
var roadsideDefect: [RoadsideDefect] = []

//MARK: Save button tapped

@IBAction func saveBtnTapped(_ sender: UIBarButtonItem) {

    guard let vehicleRegText = vehicleRegTextfieldOutlet.text, !vehicleRegText.isBlank else {
        showAlertWithTitle(title: "Error", message: "Please add vehicle reg number.")
        return
    }

    guard let detailsText = detailsTextfieldOutlet.text, !detailsText.isBlank else {
        showAlertWithTitle(title:  "Error", message: "Please add some details.")
        return
    }

    let selectedImage: UIImage? = roadsideDefectImageView?.image

    vehicleReg = vehicleRegText
    detailsDefect = detailsText

// ISSUE HERE
    UIImageWriteToSavedPhotosAlbum(selectedImage ?? HowToSetItNilOrEmpty?, self, #selector(self.image(_:didFinishSavingWithError:contextInfo:)), nil) 

    roadsideDefect.append(RoadsideDefect(vehicleRegistration: vehicleReg, detailsOfDefect: detailsDefect, imagesOfDefects: imagesDefect))


print(roadsideDefect)
}

我用评论标记了这个问题。

Answer 1

if let image = selectedImage {
   UIImageWriteToSavedPhotosAlbum(image, self, #selector(self.image(_:didFinishSavingWithError:contextInfo:)), nil)
}