UITableViewCell的內容

Question

我有一個TableView和基於數組的單元格。現在我想改變一個變量的基礎上巫婆的數組顯示在單元格中。

var array = ["first", "second", "third"] 
var result = String 

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

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 
     let Cell = self.tableView.dequeueReusableCellWithIdentifier("CellID", forIndexPath: indexPath) as UITableViewCell 

     Cell.textLabel?.text = array[indexPath.row] 

// and here I need the content of the Cell 

     switch Cell."content argument" { 
      case "first": 
       var result = "works" 
      case "second": 
       var result = "works also" 
      case "third": 
       var result = "what a surprise, works also" 
      default: 
       var result = "doesn't work" 
     } 

     return Cell 

    } 

這裏我需要參數來獲取單元格的內容。並請，沒有與「你必須創建一個新的文件或功能或擴展名」，不，只是參數請！

Answer 1

當您根據Cell.textLabel?.text進行切換時遇到的問題是textLabel爲Optional，所以它的文本也爲Optional。 Optional是一個有兩種情況的枚舉，.Some和.None，這就是爲什麼你的例子不起作用。

有兩種可能的解決方案。

1. 把你的交換機的if let語句中：

   Cell.textLabel?.text = array[indexPath.row] 
   
   if let text = Cell.textLabel?.text { 
       switch text { 
        case "first": 
         var result = "works" 
        case "second": 
         var result = "works also" 
        case "third": 
         var result = "what a surprise, works also" 
        default: 
         var result = "doesn't work" 
       } 
   } 
   

2. 基於單元格的內容，請不要開，而是在你的非可選數據：

   let text = array[indexPath.row] 
   Cell.textLabel?.text = text 
   
   switch text { 
       case "first": 
        var result = "works" 
       case "second": 
        var result = "works also" 
       case "third": 
        var result = "what a surprise, works also" 
       default: 
        var result = "doesn't work" 
   } 
   

然後存在一個問題，就是你正在創建大量未使用的局部變量，而這些局部變量都是偶然命名的結果。因此，讓我們更好地使它成爲一個常數，並將其設置在開關，也許結果添加到單元格，就像這樣：

let text = array[indexPath.row] 

    let result: String 
    switch text { 
     case "first": result = "works" 
     case "second": result = "works also" 
     case "third": result = "what a surprise, works also" 
     default:  result = "doesn't work" 
    } 

    Cell.textLabel?.text = text 
    Cell.detailTextLabel?.text = result 

---

這裏的一切所需要的代碼：

import UIKit 

class TableViewController: UITableViewController { 
    var array = ["first", "second", "third"] 

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int { 
     return 1 
    } 

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

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 
     let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) 

     let text = array[indexPath.row] 
     let result: String 
     switch text { 
     case "first": result = "works" 
     case "second": result = "works also" 
     case "third": result = "what a surprise, works also" 
     default:  result = "doesn't work" 
     } 

     cell.textLabel?.text = text 
     cell.detailTextLabel?.text = result 
     return cell 
    } 
}