Question

我有一个代码，json检索一个存储在数据库中的所有名称的数组，当你输入textField时，你可以看到建议，所以自动完成。一切都很好，唯一的问题是区分大小写，事实上如果我写了＃34;你好＆＃34;它没有找到任何东西，相反如果我输入＆＃34;你好＆＃34;他建议标签..我该如何解决？非常感谢你。我没有找到任何相关的教程。

这是我的代码：

class ViewController: UIViewController, UITextViewDelegate, UITextFieldDelegate,UITableViewDataSource, UITableViewDelegate {

let save = NSUserDefaults.standardUserDefaults()

@IBOutlet var amountPoints: UILabel!
@IBOutlet var reasonView: UITextView!
@IBOutlet var toField: UITextField!
@IBOutlet var pointsField: UITextField!

@IBOutlet var autocompleteTableView: UITableView!
var pastUrls: [String] = []
var autocompleteUrls = [String]()
override  func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    toField.delegate = self
    reasonView.layer.cornerRadius = 1
    reasonView.layer.borderWidth = 0.7
    reasonView.layer.borderColor = UIColor.grayColor().CGColor
    autocompleteTableView.delegate = self
    autocompleteTableView.dataSource = self
    autocompleteTableView.scrollEnabled = true
    autocompleteTableView.hidden = true

    getallUser()
    var Names = save.arrayForKey("give.Name")
    pastUrls = Names as! [String]
    print(pastUrls)
}
    override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}




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

    searchAutocompleteEntriesWithSubstring(substring)
    return true     // not sure about this - could be false
}

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

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

        let 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"
    let cell : UITableViewCell = tableView.dequeueReusableCellWithIdentifier(autoCompleteRowIdentifier, forIndexPath: indexPath) as UITableViewCell
    let index = indexPath.row as Int

    cell.textLabel!.text = autocompleteUrls[index]
    return cell
}

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    let selectedCell : UITableViewCell = tableView.cellForRowAtIndexPath(indexPath)!
    toField.text = selectedCell.textLabel!.text
    autocompleteTableView.hidden = true
}








func textViewDidBeginEditing(textView: UITextView) {
    reasonView.text = ""
}

func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {
    if text == "\n"
    {
        textView.resignFirstResponder()
        return false
    }
    return true
}



@IBAction func giveButton(sender: UIButton) {


}

@IBAction func returnButton(sender: UIBarButtonItem) {
    self.dismissViewControllerAnimated(true, completion: nil)

}

}

Answer 1

首先，如果您只是尝试进行前缀搜索，则可以使用hasPrefix:方法。使用此方法而不考虑大小写的一种简单方法是在调用比较方法之前获取每个字符串的小写版本：

if (myString.lowercaseString.hasPrefix(substring.lowercaseString))
{
    autocompleteUrls.append(curString)
}

如果您不介意切换回NSString类型，也可以使用rangeOfString:options:方法：

let range = (myString as NSString).rangeOfString(substring, options:[.CaseInsensitiveSearch])
if range.location == 0 {
    autocompleteUrls.append(curString)
}

Swift 1/2 AutoComplete字段不区分大小写

1 个答案: