ios - 根据 API 的结果选择 Tableview 单元格

Question

如何通过字符串传递上一个选定的单元格。从 API 我通过“|”得到结果分开，然后我在删除分隔符后将其放回 array 中。但是如何将结果传递到 tableView 中，它将根据结果选择 tableview 单元格。

这是我如何进行选择并将结果保存到数组中的虚拟代码。

class TableViewController: UITableViewController
{
let limit = 5
var lastSelectedIndexPath = NSIndexPath(forRow: -1, inSection: 0)
    var genreList = ["A","B","C","D","E","F","G","H"]
var stringRepresentation = String()
var result = [String]()
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
    let cell = tableView.dequeueReusableCellWithIdentifier("myCell", forIndexPath: indexPath) 

    // Configure the cell...
    cell.textLabel!.text = genreList[indexPath.row]

    if cell.selected
    {
        cell.accessoryType = UITableViewCellAccessoryType.Checkmark
    }
    else
    {
        cell.accessoryType = UITableViewCellAccessoryType.None
    }
    return cell
}


override func tableView(tableView: UITableView, willSelectRowAtIndexPath indexPath: NSIndexPath) -> NSIndexPath? {
    if let sr = tableView.indexPathsForSelectedRows {
        if sr.count == limit {
            let alertController = UIAlertController(title: "Oops", message:
                "You are limited to \(limit) selections", preferredStyle: .Alert)
            alertController.addAction(UIAlertAction(title: "OK", style: .Default, handler: {action in
            }))
            self.presentViewController(alertController, animated: true, completion: nil)

            return nil
        }

    }

    return indexPath
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)
{
    print("selected  \(genreList[indexPath.row])")

    let cell = tableView.cellForRowAtIndexPath(indexPath)

    if cell!.selected == true
    {
        cell!.accessoryType = UITableViewCellAccessoryType.Checkmark
        result.append((cell?.textLabel?.text)!)
        print(result)
    }
    else
    {

        cell!.accessoryType = UITableViewCellAccessoryType.None
        print(result)
    }
}


override func tableView(tableView: UITableView, didDeselectRowAtIndexPath indexPath: NSIndexPath) {

    let deselectedCell = tableView.cellForRowAtIndexPath(indexPath)

    result = result.filter { $0 != deselectedCell?.textLabel?.text }

    stringRepresentation = result.joinWithSeparator("|") // "1-2-3"

    print(stringRepresentation)

    deselectedCell!.accessoryType = UITableViewCellAccessoryType.None

}

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

}

Answer 1

尝试像这样选择单元格，为此使用您的result数组

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

    // Configure the cell...
    cell.textLabel!.text = genreList[indexPath.row]
    if result.contains(genreList[indexPath.row])
    {
        cell.accessoryType = UITableViewCellAccessoryType.Checkmark
    }
    else
    {
        cell.accessoryType = UITableViewCellAccessoryType.None
    }
    return cell
}      

现在像这样改变didSelectRowAtIndexPath

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)
{   
     tableView.deselectRowAtIndexPath(indexPath, animated: true)
     if (self.result.count != limit) {   
         if (self.result.contains(genreList[indexPath.row])) {
             let index = self.result.indexOf(genreList[indexPath.row])
             self.result.removeAtIndex(index)
         }
         else {
             self.result.append(genreList[indexPath.row])
         }
     }
     else {
         if (self.result.contains(genreList[indexPath.row])) {
             let index = self.result.indexOf(genreList[indexPath.row])
             self.result.removeAtIndex(index)   
         }
         else {
             let alertController = UIAlertController(title: "Oops", message:
            "You are limited to \(limit) selections", preferredStyle: .Alert)
             alertController.addAction(UIAlertAction(title: "OK", style: .Default, handler: {action in
         }))
             self.presentViewController(alertController, animated: true, completion: nil)
         }
     }
     stringRepresentation = result.joinWithSeparator("|")
     self.tableView.reloadData()
}

注意:从 ViewController 中删除 willSelectRowAtIndexPath 方法，现在不需要该方法了。