如果所有 UITextField 都已填充并且其中一个具有 Int 值，则启用一个按钮

Question

我在将 textField 关联到我的 shouldChangeCharactersIn func 时遇到问题，这个 textField 应该包含 Int 值。第一个 textField 应包含 String 值，第二个应包含 Int 值。仅当 textFields 填充了正确的类型时，才应启用确认按钮。那是我的应用程序：

和代码：

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
   }
}

我应该向该函数添加什么？

Answer 1

尝试创建一个函数调用 validator()。您所有的 textField 都应该添加

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

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

Answer 2

将此 @IBAction 连接到两个文本字段，对于 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

}

这将在任一字段中输入每个字符时调用。它：

首先将按钮重置为 .isEnabled = false
然后检查 id 文本字段是否有文本
然后检查目标文本字段是否有文本
然后检查目标字段是否只有数字

如果它通过所有 3 个检查，它会将按钮设置为 .isEnabled = true

Answer 3

而不是

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
}

试试这个

// 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
    }
}

并且您必须为字符串添加此扩展以将字符串验证为数值 - 将新的空白 Swift 文件添加到名为 'StringExtension' 的项目并添加：

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)
    }
}

如果所有 UITextField 都已填充并且其中一个具有 Int 值，则启用一个按钮

Enable a button if all the UITextFields are filled and one of them has an Int value

delegates

uikit

ios

swift