Question

我正在使用swift 2.0。我已将搜索栏添加到表格视图中。我跑了两次，效果很好。但现在在我的代码中显示错误：

Cannot invoke 'filter' with an argument list of type '(@noescape (Element) throws -> Bool)'

当我尝试运行也无法搜索我的表格视图数据时，

这是我的完整代码：

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UISearchBarDelegate

{

    var Table:NSArray = []

  @IBOutlet weak var searchBar: UISearchBar!
    var searchActive : Bool = false
     var filtered:[String] = []


    @IBOutlet weak var tableView: UITableView!   // UITable view declaration

    @IBOutlet weak var Resultcount: UILabel!     // count label

    let cellSpacingHeight: CGFloat = 5  // cell spacing from each cell in table view




    var filteredTableData = [String]()
    var resultSearchController = UISearchController()

    override func viewDidLoad() {


        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

       CallWebService() // call the json method


        // nib for custom cell (table view)
        let nib = UINib(nibName:"customCell", bundle: nil)
        tableView.registerNib(nib, forCellReuseIdentifier: "cell")


        searchBar.delegate = self

    }

    func searchBarTextDidBeginEditing(searchBar: UISearchBar) {
        searchActive = true;
    }

    func searchBarTextDidEndEditing(searchBar: UISearchBar) {
        searchActive = false;
    }

    func searchBarCancelButtonClicked(searchBar: UISearchBar) {
        searchActive = false;
    }

    func searchBarSearchButtonClicked(searchBar: UISearchBar) {
        searchActive = false;
    }

    func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {

        filtered = Table.filter({ (text) -> Bool in
            let tmp: NSString = text as! NSString
            let range = tmp.rangeOfString(searchText, options: NSStringCompareOptions.CaseInsensitiveSearch)
            return range.location != NSNotFound
        })
        if(filtered.count == 0){
            searchActive = false;
        } else {
            searchActive = true;
        }
        self.tableView.reloadData()
    }



    // every time app quit and run, switch will be in off state
    override func viewWillDisappear(animated: Bool) {
        super.viewWillDisappear(true)
        NSUserDefaults.standardUserDefaults().setBool(false, forKey: "PremiumUser")

    }





    func CallWebService()
    {
        let UrlApi = "url"
        let Url = NSURL(string: UrlApi)
        let Session = NSURLSession.sharedSession()
        let Work = Session.dataTaskWithURL(Url!, completionHandler: { dataTask, response, error -> Void in
            if (error != nil)
            {
                print(error)
            }
            var datos:NSData = NSData(data: dataTask!)

            do {


                let JsonWithDatos:AnyObject! = try NSJSONSerialization.JSONObjectWithData(datos, options: NSJSONReadingOptions.MutableContainers) as! NSArray


                self.Table = JsonWithDatos as! NSArray


                dispatch_async(dispatch_get_main_queue()) {



                    if (self.Table.count>0)
                    {
                        self.Resultcount.text = "\(self.Table.count) Results"
                        self.tableView.reloadData()
                    }


                }
            }catch{
                print("Some error occured")
            }


        })

        Work.resume()
    }




    // number of sections
    func numberOfSectionsInTableView(tableView: UITableView) -> Int {
       return 1
    }
    // number of rows
    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {



        if(searchActive) {
            return filtered.count
        }
       return self.Table.count
    }







        func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {



        let cell:customCell = self.tableView.dequeueReusableCellWithIdentifier("cell") as! customCell 
            if(searchActive){
               cell.vendorName.text = filtered[indexPath.row]
            } else {
                cell.vendorName.text = Table[indexPath.row] as! String;
            }

            let item = self.Table[indexPath.row] as! [String : String]
             cell.vendorName.text = item["name"]
            cell.vendorAddress.text = item["address"]


        return cell 
    }




}

我在此行[{1}}

中的此方法func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {中收到错误

为什么它的工作一次，那个时候也无法在我的表视图中进行搜索。现在我突然收到这个错误。

Answer 1

我在表格视图中实现了搜索控制器我给你的功能是过滤搜索到的数据并创建一个匹配字符串的数组

func filterDestinations(searchString: String){
    self.filteredDestinations.removeAll()
    if(self.defaultarray.count > 0){
        for obj in self.sortedDest{
            if(obj.name!.rangeOfString(searchString, options: .CaseInsensitiveSearch, range: nil, locale: nil) != nil){
                self.filteredDestinations.append(obj)
            }
        }
    }    
}// ends filterDestinations

之后你只需重新加载表视图，并在函数cellforrowatindex中检查如果搜索控制器处于活动状态而不是从填充数组中提供数据，否则使用默认数组。你也必须通过检查搜索控制器是否有效来设置numberofrows。如果它处于活动状态，则返回填充数组计数，否则返回默认数组计数，以便您的应用程序不会崩溃。

Answer 2

只需删除closure参数和返回值类型即可。如果找不到字符串，rangeOfString也会返回nil。最好投射到Swift String而不是NSString。您正尝试将NSArray（基本上[AnyObject]分配给[String]。您必须进行一些映射。

filtered = table.filter {
    let tmp = $0 as! String
    let range = tmp.rangeOfString(searchText, options: .CaseInsensitiveSearch)
    return range != nil
}.map { $0 as! String }

Tableview搜索栏在我运行时没有显示任何数据并且有时会出现一些错误

2 个答案: