Ios 的值没有成员

我试图通过观看Youtube教程获得CustomCell，但我在Tableview上遇到了这个问题 “CustomCell”类型的值没有成员“mainImage”。我希望你们中的一些人能帮助我解决这个问题

我想在手机中获取的主要图像位于CustomCell.swift中

我的TableViewController：

import UIKit

struct CellData {
    let image : UIImage?
    let message : String?

}

var data = [CellData]()

class TableViewController : UITableViewController{

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        data = [CellData.init(image: #imageLiteral(resourceName: "Bildschirmfoto 2018-09-20 um 22.17.11"), message: "The Avengers")]
        self.tableView.register(CustomCell.self, forCellReuseIdentifier: "custom")
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let cell = self.tableView.dequeueReusableCell(withIdentifier: "custom") as! CustomCell
        cell.mainImage = data[indexPath.row].image
        return cell
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        <#code#>
    }
}

---

您必须将子视图放入单元格类中：

class CustomCell: UITableViewCell {

    var messageView: UITextView = {
        var textView = UITextView()
        textView.translatesAutoresizingMaskIntoConstraints = false
        return textView
    }()

    var mainImageView: UIImageView = {
        var imageView = UIImageView()
        imageView.translatesAutoresizingMaskIntoConstraints = false
        return imageView
    }()

    ...
}

---

为什么要将所有这些变量声明为全局变量，而不是使它们成为类属性？

class CustomCell: UITableViewCell {

    var messageView: UITextView = {
        var textView = UITextView()
        textView.translatesAutoresizingMaskIntoConstraints = false
        return textView
    }()

    var mainImageView: UIImageView = {
        var imageView = UIImageView()
        imageView.translatesAutoresizingMaskIntoConstraints = false
        return imageView
    }()

    ...
}