Question

尝试从Class生成简单的tableview。如果我制作单元格=＆＃34; A＆＃34;它会在所有单元格中打印出A，但是对于当前的代码输出，它只显示一个空白表格。我究竟做错了什么？对不起自学新手。

import UIKit

class LinesViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

@IBOutlet weak var linesTableView: UITableView!
let cellID = "cell"
let lines = ["brown","red","blue"]

class Train  {
    var color: String = ""
    var line: String = ""

    init (color:String?, line:String?){
    }
}

let brownLine = Train(color: "brown", line: "Brown Line")
let redLine = Train(color: "red", line: "Red Line")
let blueLine = Train(color: "blue", line: "Blue Line")
var trains: [Train] = []

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
    linesTableView.delegate = self
    linesTableView.dataSource = self
    trains = [brownLine,redLine,blueLine]
    //print (trains[1].line)

}

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

func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return lines.count
}

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

    let cell = linesTableView.dequeueReusableCell(withIdentifier: cellID, for: indexPath)

    let train = trains[indexPath.row]
    cell.textLabel?.text = train.line

    return cell
}

Answer 1

您没有将传递值分配给类数据成员。这就是为什么他们总是空着的。

class Train  {
    var color: String = ""
    var line: String = ""

    init (color:String?, line:String?){
        self.color = color
        self.line = line
    }
}

tableview单元格不显示类中的文本

1 个答案: