如果所有 UITextField 都已填充且其中一個具有 Int 值，則啟用按鈕

Question

我將 textField 關聯到我的shouldChangeCharactersIn函數時遇到問題，並且此 textField 應包含 Int 值。 第一個 textField 應該包含 String 值，第二個應該包含 Int 值。 只有當 textFields 填充了正確的類型時，才應啟用確認按鈕。 那是我的應用程序：

和代碼：

import UIKit

class LoginViewController: UIViewController, UITextFieldDelegate {

   var av = ActualValues()
   var statsVC = StatsViewController()
   var closureBlock: (() -> Void)?

   @IBOutlet weak var idTextField: UITextField!
   @IBOutlet weak var idCheckButton: UIButton!
   @IBOutlet weak var segmentedControl: UISegmentedControl!
   @IBOutlet weak var targetsTextField: UITextField!

   override func viewDidLoad() {
      super.viewDidLoad()

      statsVC.allRunsFunc()
      idTextField.delegate = self
      idCheckButton.isEnabled = false
   }

   override func viewWillAppear(_ animated: Bool) {
      super.viewWillAppear(animated)
      av.shift = 1
      allRunsFunc()
   }

   @IBAction func idCheckButtonDidPress(_ sender: UIButton) {
      av.id = idTextField.text!
      av.databaseID = String(runs + 1)
      av.target = targetsTextField.text!
      closureBlock?()
      if let delegate = self.summaryButtonIsEnabledDelegate {
         delegate.toggleSummaryButton()
      }

      self.dismiss(animated: true, completion: nil)
   }

   @IBAction func segmentedControlChanged(_ sender: UISegmentedControl) {
      switch segmentedControl.selectedSegmentIndex {
      case 0:
        av.shift = 1
      case 1:
        av.shift = 2
      case 2:
        av.shift = 3
      default:
        av.shift = 1
      }
   }

   func configureID(model: ActualValues) {
     av = model
   }

   func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String, int: Int) -> Bool {
      let text = (idTextField.text! as NSString).replacingCharacters(in: range, with: string)
      if text.isEmpty {
         idCheckButton.isEnabled = false
      } else {
         idCheckButton.isEnabled = true
      }

      return true
   }
}

我應該在該函數中添加什么？

Answer 1

嘗試創建一個 function 調用validator() 。 你所有的 textField 都應該被添加

textField.addTarget(self, action: #selector(self.textFieldDidChange(_:)), for: .editingChanged)

@objc func textFieldDidChange(_ textField: UITextField) {
        // TODO : Validate all of your textField value here
}

Answer 2

將此@IBAction連接到兩個文本字段，用於Editing Changed ：

@IBAction func textFieldEdited(_ sender: Any) {

    // reset to disabled every time a text field value changes
    //  will be set to enabled if data is validated
    idCheckButton.isEnabled = false

    // make sure idTextField has text
    guard let idText = idTextField.text, idText != "" else {
        return
    }
    // make sure targetsTextField has text
    guard let targetsText = targetsTextField.text, targetsText != "" else {
        return
    }
    // make sure targetsTextField has only numbers
    guard targetsText.rangeOfCharacter(from: CharacterSet.decimalDigits.inverted) == nil else {
        return
    }

    // enable the button
    idCheckButton.isEnabled = true

}

這將在任一字段中輸入的每個字符時調用。 它：

• 首先將按鈕重置為.isEnabled = false
• 然后檢查 id 文本字段是否有文本
• 然后檢查目標文本字段是否有文本
• 然后檢查目標字段是否只有數字

如果它通過所有 3 次檢查，它將按鈕設置為.isEnabled = true

Answer 3

代替

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String, int: Int) -> Bool {
   let text = (idTextField.text! as NSString).replacingCharacters(in: range, with: string)
   if text.isEmpty {
      idCheckButton.isEnabled = false
   } else {
      idCheckButton.isEnabled = true
   }

   return true
}

嘗試這個

// Add these variables
var idValid = false
var targetsValid = false

func textFieldDidChangeSelection(_ textField: UITextField) {
    if textField == idTextField {
         // Verify id has text
        if textField.text! != "" {
            idValid = true
        } else {
            idValid = false
        }
    }
    if textField == targetsTextField {
        // Verify targets is numeric
        if textField.text!.isNumeric {
            targetsValid = true
        } else {
            targetsValid = false
        }
    }
    if idValid && targetsValid {
        // Both valid enable
        idCheckButton.isEnabled = true
    } else {
        // Not both valid disable
        idCheckButton.isEnabled = false
    }
}

您必須為字符串添加此擴展名以驗證字符串是否為數值 - 將新的空白 Swift 文件添加到名為“StringExtension”的項目並添加：

import Foundation
import UIKit

extension String {
    var isNumeric: Bool {
        guard self.count > 0 else { return false }
        let nums: Set<Character> = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"]
        return Set(self).isSubset(of: nums)
    }
}