aircraft aircraft - 24 days ago 11
iOS Question

Q:Value of type '[String]' has no member 'filtered'

In my Code when I

implementation
my
func
:
filterContentForSearchText(searchText:String, scope:String)


error comes:

let resultPredicate:NSPredicate = NSPredicate.init(format: "name contains[c] \(searchText)", searchText)
resultDataSource = dataSource?.filtered(using: resultPredicate) as NSArray? // the red error:Value of type '[String]' has no member 'filtered'


I post my code below:

import UIKit

class StoreListViewController: UIViewController, UISearchBarDelegate,UISearchDisplayDelegate,UITableViewDelegate,UITableViewDataSource {

var dataSource:[String]? = nil
var resultDataSource:NSArray? = nil

override func viewDidLoad() {
super.viewDidLoad()

initData()
initUI()
}


/*
// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/

// MARK: - init
func initData(){

self.searchDisplayController?.searchResultsDelegate = self
self.searchDisplayController?.searchResultsDataSource = self
self.searchDisplayController?.delegate = self

dataSource = ["中青年年是当年是你的","中青年年是当年是你的","中青年年是当年是你的","中青年年是当年是你的","中青年年是当年是你的","中青年年是当年是你的" ]
}
func initUI() -> Void {


}


// MARK: - tableView delegate

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

if tableView == self.searchDisplayController?.searchResultsTableView {

return (dataSource?.count)!
}else {

return (resultDataSource?.count)!
}
}

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 50
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

let cell_id = "StoreListTabCell"

var cell:StoreListTabCell = tableView.dequeueReusableCell(withIdentifier: cell_id) as! StoreListTabCell

// 配置cell
cell.title_label.text = dataSource?[indexPath.row]

return cell
}

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

tableView.deselectRow(at: indexPath, animated: true)
}

// MARK: - filter delegate
func filterContentForSearchText(searchText:String, scope:String) -> Void {

// NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"name contains[c] %@", searchText];
// filteredist = [OldList filteredArrayUsingPredicate:resultPredicate];
let resultPredicate:NSPredicate = NSPredicate.init(format: "name contains[c] \(searchText)", searchText)
resultDataSource = dataSource?.filtered(using: resultPredicate) as NSArray? // there is the error!!!
}

func searchDisplayController(_ controller: UISearchDisplayController, shouldReloadTableForSearch searchString: String?) -> Bool {

//let scope_str = searchDisplayController?.searchBar.scopeButtonTitles.objectAtIndex(self.searchDisplayController.searchBar.selectedScopeButtonIndex)
//[self filterContentForSearchText:searchString scope:[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]];

var scopeTitles:Array = (searchDisplayController?.searchBar.scopeButtonTitles)!

let selected_index = searchDisplayController?.searchBar.selectedScopeButtonIndex

let scope_str = scopeTitles[selected_index!]


filterContentForSearchText(searchText: searchString!, scope:scope_str)

return true
}

}


And in my storyboard :

enter image description here

Answer

Because Swift array does not support NSArray's filterred with predicate, you have to use array.filter{ $0.contains(searchText) } (recommended) or array.filter{resultPredicate.evaluate(with:$0)} (to use with NSPredicate - totally not cool with swift) instead of the one you are using

Full:

array.filter { (item) -> Bool in
            resultPredicate.evaluate(with: item)
        }
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