" '(문자열) -> BOOL을'유형의 값을 변환 할 수 없습니다 예상 인수"

Question

미안 IndexPath.row 데이터를 내 TableView에 검색 창이를 구현하는 몇 가지 문제가 내가 함께 무슨 일을하는지 알 수 없을

이 오류 메시지가 :

이 (postStruct) -> Bool

내가 여기 func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String)

에서이 오류 메시지가 예상 인수 유형에 유형 (String) -> Bool의 값을 변환 할 수 없음 내 코드

import UIKit 
import Firebase 
import FirebaseDatabase 

    struct postStruct { 
     let username : String! 
     let school : String! 
    } 

class TableViewProfileController: UITableViewController, UISearchBarDelegate { 


    @IBOutlet weak var searchBar: UISearchBar! 

    var posts:[postStruct] = [] 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     self.title = "Find friends" 
     searchBar.delegate = self 
     tableView.dataSource = self 


     //Hide backButton in Navigationbar 
     self.navigationItem.setHidesBackButton(true, animated: false) 

     // SearchController 
     searchBar.sizeToFit() 
     searchBar.searchBarStyle = .minimal 
     searchBar.placeholder = "Search here..." 
     searchBar.setShowsCancelButton(false, animated: true) 
     searchBar.keyboardAppearance = .default 
     searchBar.tintColor = UIColor(red: 38.0/255.0, green: 68.0/255.0, blue: 102.0/255.0, alpha: 1.0) 
     self.definesPresentationContext = true 
     self.tableView.reloadData() 

    // TableView Cell Content 
    let databaseRef = FIRDatabase.database().reference() 

     databaseRef.child("users").queryOrderedByKey().observe(.childAdded, with: { 
      snapshot in 
      let snapshotValue = snapshot.value as? NSDictionary 
      let username = snapshotValue!["Username"] as! String 
      let school = snapshotValue!["School"] as! String 

      self.posts.insert(postStruct(username: username, school: school) , at: 0) 
      self.tableView.reloadData() 
     }) 
    } 

     func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) { 
     posts = searchText.isEmpty ? posts : posts.filter({(dataString: String) -> Bool in 
      return dataString.range(of: searchText, options: .caseInsensitive) != nil 
     }) 

     tableView.reloadData() 
    } 

    func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) { 
     self.searchBar.showsCancelButton = true 
    } 

    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) { 
     searchBar.showsCancelButton = false 
     searchBar.text = "" 
     searchBar.resignFirstResponder() 
    } 

    override func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat { 
     return 2.0 
    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
    } 

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

     return self.posts.count 
    } 

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

     let cell = tableView.dequeueReusableCell(withIdentifier: "Cell") 

     let label1 = cell?.viewWithTag(1) as! UILabel 
     label1.text = posts[indexPath.row].username 
     label1.font = UIFont(name: "Arial Rounded MT Bold", size: 16) 
     label1.textColor = UIColor.black 

     let label2 = cell?.viewWithTag(2) as! UILabel 
     label2.text = posts[indexPath.row].school 
     label2.font = UIFont(name: "Arial", size: 11) 
     label2.textColor = UIColor(red: 102.0/255.0, green: 102.0/255.0, blue: 102.0/255.0, alpha: 1.0) 


     cell?.imageView?.image = UIImage(named: "Userlogo") 

     return cell! 
     } 


    //Preparing Segue to show username in FindUserViewController 
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { 

     performSegue(withIdentifier: "findSegue", sender: self.posts[indexPath.row].username) 
    } 

    //Segue to show username in FindUserViewController 
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 

     if segue.identifier! == "findSegue" { 
     let guest = segue.destination as! FindUserViewController 
     guest.pickedUser = sender as! String 

     let backItem = UIBarButtonItem() 
     backItem.title = "Back" 
     navigationItem.backBarButtonItem = backItem 

     } 
    } 
} 

Answer 1

당신은 postStruct 배열에 filter 함수를 적용되므로 구문 적어도

posts.filter({ (post: postStruct) -> Bool in ... }) 

또는

posts.filter { post in ... } 

짧은 넌

posts = searchText.isEmpty ? posts : posts.filter { post in 
     return post.username.range(of: searchText, options: .caseInsensitive) != nil 
} 

를 검색 할 수있다

사이드 노트 :

암시적인 언 래핑 된 선택적 멤버를 구조체에 선언하십시오. 절대로하지 마십시오.

실제로는 선택 사항이며 String?으로 선언하거나 선택 사항이 아니므로 느낌표를 잘라냅니다.