UISearchbar using UItextfield in swift 4

问题

I am working on JSON. My Json data print into the tableview. I want to filtered that data with searchbar. So I put Textfield for using the Searchbar. I use reference from this website

http://findnerd.com/list/view/How-to-create-your-own-search-bar-in-Swift-Not-using-UISearchBar/20577/

My Search bar is working but not properly. I want to filter data after I write 3 Words in searchbar.If I write "Ku" then my tableview remain hide. If I write "kus" in searchbar then searchbar started searching and show me filtered data in tableview started from "kus". my searchbar related code are these

struct PatientData:Decodable {
var ID : String
var dt_bod : String
var e_gender : String
var int_glcode : String
var var_email : String
var var_fname : String
var var_phoneno : String
var var_uname : String

init(userdata : [String:Any]) {
    self.ID = userdata["ID"] as! String
    self.dt_bod = userdata["dt_bod"] as! String
    self.e_gender = userdata["e_gender"] as! String
    self.int_glcode = userdata["int_glcode"] as! String
    self.var_email = userdata["var_email"] as! String
    self.var_fname = userdata["var_fname"] as! String
    self.var_phoneno = userdata["var_phoneno"] as! String
    self.var_uname = userdata["var_uname"] as! String

} 

var tabledata = [String]()
var tableFilterData = [String]()
var patientDetails = [PatientData]()

@IBAction func textfieldchanged(_ sender: Any) {
    tableview.isHidden = true
}

my textfield change character function

public func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool{

    let searchText  = textField.text! + string
    if searchText.count >= 3 {
        tableview.isHidden = false

        tableFilterData = tabledata.filter({ (result) -> Bool in
            return result.range(of: searchText, options: .caseInsensitive) != nil
        })

        print(tableFilterData)   // I got filtered data here but how to show this data into the tableview
        tableview.reloadData()
    }
    else{
        tableFilterData = []
    }
    return true
}

tableview part is

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

        return patientDetails.count
     }

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell:UITableViewCell = tableView.dequeueReusableCell(withIdentifier: "cell") as UITableViewCell!

    let aa = patientDetails[indexPath.row].var_fname + " , " + patientDetails[indexPath.row].dt_bod + " , " + patientDetails[indexPath.row].var_phoneno

    self.tabledata.append(aa)

        cell.textLabel?.text = aa
        cell.textLabel?.font = searchTextfield.font

    return cell
}

回答1:

Try this:

@objc func textFieldActive() {
    tableView.isHidden = tableFilterData.count > 0 ? false : true
}

public func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool{

    let searchText  = textField.text! + string

    if searchText.count >= 3 {
        tableView.isHidden = false

        tableFilterData = tabledata.filter({ (result) -> Bool in
            return result.range(of: searchText, options: .caseInsensitive) != nil
        })

        tableView.reloadData()
    }
    else{
        tableFilterData = []
    }

    return true
}

func tableView(_ tableView: UITableView, numberOfRowsInSection 
section: Int) -> Int {
    return tableFilterData.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let data = tableFilterData[indexPath.row]

    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)

    cell.textLabel?.text = data

    return cell
}

回答2:

In Swift 4 or Swift 5, you can use like bellow.. Your tableview like bellow

Create a project
Create add textfield, tableView connect to viewcontroller

add bellow code..

 class ViewController: UIViewController ,UITableViewDelegate,UITableViewDataSource,UITextFieldDelegate{

  @IBOutlet weak var tableView: UITableView!
  @IBOutlet weak var txtName: UITextField!

  var originalArr = [[String:Any]]();
  var searchArrRes = [[String:Any]]()
  var searching:Bool = false

 override func viewDidLoad() {
    super.viewDidLoad()

    //Assign delegate  don't forget
    txtName.delegate = self
    tableView.delegate = self
    tableView.dataSource = self

   //my array
  originalArr =   [
    ["name": "abdul", "number": "+8800000001"],
    ["name": "abdin", "number": "+8800000002"],
    ["name": "Enamul", "number": "+8800000003"],
    ["name": "enam", "number": "+8800000004"],
    ["name": "Rafi", "number": "+8800000005"],
    ["name": "Ehaque", "number": "+8800000006"],
    ["name": "ab", "number": "+8800000007"],
    ["name": "Emon", "number": "+8800000008"],
    ["name": "enamu1", "number": "+8800000009"],
    ["name": "rafi", "number": "+88000000010"],
    ["name": "karim", "number": "+88000000011"],
    ["name": "radev", "number": "+88000000012"],
    ["name": "da", "number": "+88000000013"],
    ["name": "aa", "number": "+88000000014"],
    ["name": "rafi", "number": "+88000000010"],
    ["name": "karim", "number": "+88000000011"],
    ["name": "radev", "number": "+88000000012"],
    ["name": "da", "number": "+88000000013"],
    ["name": "aa", "number": "+88000000014"]
   ]

}


func textFieldShouldReturn(_ textField: UITextField) -> Bool {
   textField.resignFirstResponder()
   return true
}

 public func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool{
   //input text
   let searchText  = textField.text! + string
  //add matching text to arrya
   searchArrRes = self.originalArr.filter({(($0["name"] as! String).localizedCaseInsensitiveContains(searchText))})

  if(searchArrRes.count == 0){
    searching = false
  }else{
    searching = true
 }
  self.tableView.reloadData();

  return true
}


  func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
   //check search text & original text
   if( searching == true){
      return searchArrRes.count
   }else{
      return originalArr.count
   }
 }

  func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
  //custom cell Custom_cell
  let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! Custom_cell
  //check search text & original text
   if( searching == true){
    var dict = searchArrRes[indexPath.row]
    cell.label_name.text = dict["name"] as? String
    cell.label_number.text = dict["number"] as? String
  }else{
    var dict = originalArr[indexPath.row]
    cell.label_name.text = dict["name"] as? String
    cell.label_number.text = dict["number"] as? String

 }

  return cell
}


}

You can download full source from GitHub Link: https://github.com/enamul95/TableView_Search

回答3:

You can check size of text before filter:

public func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool{

    var searchText  = textField.text! + string

    if string  == "" {
        searchText = (searchText as String).substring(to: searchText.index(before: searchText.endIndex))
    }
    if searchText == "" {
        isSearch = false
        tableview.reloadData()
    }
    else{
        if searchText.count > 2 {
           getSearchArrayContains(searchText)
        }  
    }
    return true
}

回答4:

Please use this code:-

func getSearchArrayContains(_ text : String) {

    tableFilterData = tableData.filter({$0.lowercased().contains(text)})
    isSearch = true
     tableview.reloadData()
}

For should three character use this linkenter link description here:-

Thanks

来源：https://stackoverflow.com/questions/53100452/uisearchbar-using-uitextfield-in-swift-4

标签

ios

swift

uisearchbar