Disabling keyboard input when using a UITextField + UIPickerview

Question

This project also click on the textfield pickerview opens, but the data shown above can be entered in the section. How can I turn it off? So just come to my choices below.

If the textfield is clicked, I open the pickerview:

import UIKit
import NVActivityIndicatorView

struct kategoriData {
    var text : String?
    var id : String?
}

class KonuEkleViewController: UIViewController,UITextFieldDelegate , NVActivityIndicatorViewable , UIPickerViewDataSource , UIPickerViewDelegate{
    @IBOutlet weak var txtBaslik: UITextField!
    @IBOutlet weak var txtYazi: UITextView!
    @IBOutlet weak var txtLink: UITextField!
    @IBOutlet weak var btnKonuAc: UIButton!
    @IBOutlet weak var txtKategoriSecimi: UITextField!

    let size = CGSize(width: 30, height: 30)
    let singleton = Global.sharedGlobal
    let ConnectString = Connect.ConnectInfo
    var kategoriList = [kategoriData]()
    let GirisView = GirisViewController()
    var secilenKategori : String?

    var dbKategoriIsim : String?
    var dbKategoriId:String?

    override func viewDidLoad() {
        super.viewDidLoad()
        txtKategoriSecimi.text = "Kategoriyi Seçiniz"
        KategoriGetir()
        pickerGrafik()
        txtYazi.layer.cornerRadius = 10
        btnKonuAc.layer.cornerRadius = 10

        let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(GirisViewController.dismissKeyboard))
        view.addGestureRecognizer(tap)
    }
    func dismissKeyboard() {
        view.endEditing(true)
    }


    @IBAction func btnKonuEkle(_ sender: Any) {
       GirisView.LoadingIcon(tur: 0)
        if txtBaslik.text != "" && txtYazi.text != "" && secilenKategori != nil && txtKategoriSecimi.text != "Kategoriyi Seçiniz"
        {
            KonuEkle(uye: singleton.username, baslik: txtBaslik.text!, mesaj: txtYazi.text, kategori: secilenKategori!, link: txtLink.text!)
        }
        else
        {
            GirisView.Bildiri(baslik: "UYARI", mesaj: "Boş Alanları Doldurunuz", tur: 1)
        }
        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1.0) {
            self.GirisView.LoadingIcon(tur: 1)
        }

    }

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

    }
    func KonuEkle(uye:String , baslik:String ,mesaj:String , kategori:String , link:String)
    {
        var request = URLRequest(url: URL(string:ConnectString.conString + "/KonuEkle")!)
        request.httpMethod = "POST"
        var postString = "uye="+uye+"&&baslik="+baslik+"&&mesaj="+mesaj+"&&kategori="+kategori+"&&link="+link
        postString = postString.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)!
        request.httpBody = postString.data(using: .utf8)
        let task = URLSession.shared.dataTask(with: request) { (data, response, error) in

            if error != nil
            {
                print("error")
            }

            if let urlContent = data
            {

                do
                {
                    let jsonResult = try JSONSerialization.jsonObject(with: urlContent, options: JSONSerialization.ReadingOptions.mutableContainers) as AnyObject
                    print(jsonResult)
                    if let gelenDizi = jsonResult as? NSArray
                    {
                        for i in 0..<gelenDizi.count
                        {
                            if let gelenMesaj = (gelenDizi[i] as? NSDictionary)?["mesaj"] as? String
                            {
                                DispatchQueue.main.async {
                                    self.Sonuc(mesaj:gelenMesaj)
                                }

                            }

                        }

                    }


                }
                catch
                {
                    print("server hatası")
                }
            }
            DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1.0) {
                self.GirisView.LoadingIcon(tur: 1)
            }
        }
        task.resume()
    }


    func Sonuc(mesaj:String)
    {
        var mesajSonuc = ""
        var mesajBaslik = ""

        if mesaj == "basarili"
        {
            mesajSonuc = "Konu Açıldı"
            mesajBaslik = "Bilgi"
        }
        else
        {
            mesajSonuc = "Bir Hata Oluştu Lütfen Destek Bölümünden Bize Ulaşın"
            mesajBaslik = "Uyarı"
        }

        let appearance = SCLAlertView.SCLAppearance(showCloseButton: false)
        let alert = SCLAlertView(appearance: appearance)
        _ = alert.addButton("Tamam") {

            self.txtLink.text = ""
            self.txtYazi.text = ""
            self.txtBaslik.text = ""
            self.navigationController!.popViewController(animated: true)
        }
        if mesajBaslik == "Bilgi"
        {
        _ = alert.showSuccess(mesajBaslik, subTitle:mesajSonuc)
        }
        else
        {
        _ = alert.showNotice(mesajBaslik, subTitle:mesajSonuc)
        }

    }
        func pickerGrafik()
    {
        let pickerView = UIPickerView()

        pickerView.delegate = self

        txtKategoriSecimi.inputView = pickerView

        let toolBar = UIToolbar(frame: CGRect(x: 0, y: self.view.frame.size.height/6, width: self.view.frame.size.width, height: 40.0))

        toolBar.layer.position = CGPoint(x: self.view.frame.size.width/2, y: self.view.frame.size.height-20.0)

        toolBar.barStyle = UIBarStyle.blackTranslucent

        toolBar.tintColor = UIColor.white

        toolBar.backgroundColor = UIColor.black


        let defaultButton = UIBarButtonItem(title: "İptal", style: UIBarButtonItemStyle.plain, target: self, action: #selector(KonuEkleViewController.tappedToolBarBtn))

        let doneButton = UIBarButtonItem(title: "Tamam", style: UIBarButtonItemStyle.done, target: self, action: #selector(KonuEkleViewController.donePressed))

        let flexSpace = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: self, action: nil)

        let label = UILabel(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width / 3, height: self.view.frame.size.height))

        label.font = UIFont(name: "Helvetica", size: 12)

        label.backgroundColor = UIColor.clear

        label.textColor = UIColor.white

        label.text = "Kategoriyi Seçiniz"

        label.textAlignment = NSTextAlignment.center

        let textBtn = UIBarButtonItem(customView: label)

        toolBar.setItems([defaultButton,flexSpace,textBtn,flexSpace,doneButton], animated: true)

        txtKategoriSecimi.inputAccessoryView = toolBar
    }

    func donePressed(_ sender: UIBarButtonItem) {
        txtKategoriSecimi.resignFirstResponder()
    }

    func tappedToolBarBtn(_ sender: UIBarButtonItem) {

        txtKategoriSecimi.resignFirstResponder()
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.view.endEditing(true)
    }

    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return kategoriList.count
    }

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return kategoriList[row].text
    }

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        txtKategoriSecimi.text = kategoriList[row].text
        secilenKategori = kategoriList[row].id
    }

    func KategoriGetir()
    {
        kategoriList.removeAll()
        //SADECE 1 DEFA EKLENIYOR
        self.kategoriList.append(kategoriData.init(text: "Kategoriyi Seçiniz", id: "1"))
        GirisView.LoadingIcon(tur: 0)
        var request = URLRequest(url: URL(string:ConnectString.conString + "/KategoriGetir")!)
        request.httpMethod = "POST"
        var postString = "tur=1&&kategori="
        postString = postString.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)!
        request.httpBody = postString.data(using: .utf8)
        let task = URLSession.shared.dataTask(with: request) { (data, response, error) in

            if error != nil
            {
                print("error")
            }

            if let urlContent = data
            {
                do
                {
                    let jsonResult = try JSONSerialization.jsonObject(with: urlContent, options: JSONSerialization.ReadingOptions.mutableContainers) as AnyObject
                    print(jsonResult)
                    if let gelenDizi = jsonResult as? NSArray
                    {
                        for i in 0..<gelenDizi.count
                        {

                            if let gelenKategori = (gelenDizi[i] as? NSDictionary)?["kategoriisim"] as? String
                            {
                                self.dbKategoriIsim = gelenKategori
                            }
                            if let gelenId = (gelenDizi[i] as? NSDictionary)?["id"] as? String
                            {
                                self.dbKategoriId = gelenId
                            }
                            self.kategoriList.append(kategoriData.init(text: self.dbKategoriIsim, id: self.dbKategoriId))

                        }

                    }



                }
                catch
                {
                    print("error")
                }
            }
            DispatchQueue.main.asyncAfter(deadline: DispatchTime.now()) {
                self.GirisView.LoadingIcon(tur: 1)
            }
        }
        task.resume()
    }


}

Answer 1

You can implement the UITextFieldDelegate method:

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

To return false so that entering any character by hand would be prevented.

Answer 2

This isn't an actual problem when running on a real iPhone device, since no keyboard will be available to do the typing :)

This is only seems like an issue when running on the iOS simulator, since you can then use your Mac keyboard as well.

---

Having said, you definitely should go with Mr. Hedgehog answer if you still want to block text input to your field.

If, besides blocking input, you may also want to hide the caret on the text field, also try this:

class PickerBasedTextField: UITextField {
    override func caretRect(for position: UITextPosition) -> CGRect {
        return CGRect.zero
    }
}