ios - 使用自动完成文本字段时不调用 cellForRowAtIndexPath 方法

Question

我正在 Swift 中开发自动完成文本字段。

我使用了这个例子:

Getting autocomplete to work in swift

但对我来说 cellForRowAtIndexPath 方法根本没有调用。我不知道我在这里犯了什么错误。

我的代码是这样的:

 @IBOutlet weak var autocompleteTableView: UITableView!
    @IBOutlet weak var searclLocationTextField: UITextField!

    var pastUrls = ["Men", "Women", "Cats", "Dogs", "Children"]
    var autocompleteUrls = [String]()


    override func viewDidLoad() {
        super.viewDidLoad()


        autocompleteTableView.scrollEnabled = true
        autocompleteTableView.hidden = true

        // Do any additional setup after loading the view.
    }

//    func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool
//    {
//        autocompleteTableView.hidden = false
//        var substring = (textField.text as NSString).stringByReplacingCharactersInRange(range, withString: string)
//        
//        searchAutocompleteEntriesWithSubstring(substring)
//        return true     // not sure about this - could be false
//    }

    func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool
    {
        println("banana")
        autocompleteTableView.hidden = false
        var substring = (searclLocationTextField.text as NSString).stringByReplacingCharactersInRange(range, withString: string)

        searchAutocompleteEntriesWithSubstring(substring)
        autocompleteTableView.reloadData()
        return true
    }


    func searchAutocompleteEntriesWithSubstring(substring: String)
    {
        autocompleteUrls.removeAll(keepCapacity: false)

        for curString in pastUrls
        {
            var myString:NSString! = curString as NSString

            var substringRange :NSRange! = myString.rangeOfString(substring)

            if (substringRange.location  == 0)
            {
                autocompleteUrls.append(curString)
            }
        }

        autocompleteTableView.reloadData()
    }

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

        return autocompleteUrls.count
    }


    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
    {
        let autoCompleteRowIdentifier = "AutoCompleteRowIdentifier"
        var cell = tableView.dequeueReusableCellWithIdentifier(autoCompleteRowIdentifier) as? UITableViewCell

        if let tempo1 = cell
        {
            let index = indexPath.row as Int
            cell!.textLabel!.text = autocompleteUrls[index]
        } else
        {
            cell = UITableViewCell(style: UITableViewCellStyle.Value1, reuseIdentifier: autoCompleteRowIdentifier)
        }
        return cell!
    }


    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        let selectedCell : UITableViewCell = tableView.cellForRowAtIndexPath(indexPath)!
        searclLocationTextField.text = selectedCell.textLabel!.text

        println(searclLocationTextField.text)
    }

Answer 1

func searchAutocompleteEntriesWithSubstring(substring: String)
{
    autocompleteUrls.removeAll(keepCapacity: false)

    for curString in pastUrls
    {
        var myString:NSString! = curString as NSString

        var substringRange :NSRange! = myString.rangeOfString(substring)

        if (substringRange.location  == 0)
        {
            autocompleteUrls.append(curString)
        }
    }

    autocompleteTableView.reloadData()
}

在重新加载 tableView 之后，您最终会在这一行 autocompleteUrls.append(curString) 获得数组，因此将数组计数记录在 autocompleteUrls.append(curString) 这一行下面，如果您肯定会得到一些东西， cellForRowAtIndexPath 将被命中.