Styjun

I have to make validation on ui text field which used in library called RSFloatInputView.

Here is my xib

import UIKit
import RSFloatInputView

class TextInputLayout: UIView 

 @IBOutlet weak var revealButton: UIButton!
 @IBOutlet weak var warningLabel: UILabel!
 @IBOutlet weak var rsFloatingView: RSFloatInputView!
 var contentView: UIView?

 override init(frame: CGRect) 
 super.init(frame: frame)
 xibSetup()
 

 required init?(coder aDecoder: NSCoder) 
 super.init(coder: aDecoder)
 xibSetup()
 

 func xibSetup() 
 contentView = loadViewFromNib()
 contentView!.frame = bounds
 contentView!.autoresizingMask = [UIView.AutoresizingMask.flexibleWidth, UIView.AutoresizingMask.flexibleHeight]
 addSubview(contentView!)
 

 func loadViewFromNib() -> UIView! 
 let bundle = Bundle(for: type(of: self))
 let nib = UINib(nibName: "TextInputLayout", bundle: bundle)
 let view = nib.instantiate(withOwner: self, options: nil)[0] as! UIView
 revealButton.tintColor = Color.grayColor()
 warningLabel.textColor = UIColor.red

 return view
 

I want to implement this in this view controller, when i click on next button

import UIKit
import DLRadioButton

class SecureWalletViewController: UIViewController,UITextFieldDelegate 

 @IBOutlet weak var securityPinStackView: UIStackView!
 @IBOutlet weak var securityPin: TextInputLayout!
 @IBOutlet weak var confirmSecurityPin: TextInputLayout!

 @IBAction func onNextButtonTap(_ sender: Any) 

 

 func textInputLayout(at index:Int) -> TextInputLayout 
 return securityPinStackView.arrangedSubviews[index] as! TextInputLayout
 

Use validations for UITextFieldDelegate method like given below:

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

Or use custom validation function Here

 Iam using this 
 // add func in swift class
 struct validatorConstants
 static let errorMsg = "your error messages"
 static let customMsg = "your error messages"
 static let emailMsg = "your error messages"
 
 class Validators: NSObject 

 //MARK: Validation on any Empty TextField
 func validators(TF1:UITextField,errorMsg:String = validatorConstants.errorMsg,fieldName:String = "") -> Bool 
 var error = validatorConstants.errorMsg
 if fieldName.count > 0 
 error = fieldName + " is missing"
 
 if TF1.text?.isEmpty == true
 kAppDelegate.showNotification(text: error)
 return false
 
 return true
 

 //MARK: Validation on any Email TextField
 func validatorEmail(TF1:UITextField,errorMsg:String = validatorConstants.errorMsg ,errorMsgEmail:String = validatorConstants.emailMsg,fieldName:String = "Email" ) -> Bool 
 var error = validatorConstants.errorMsg
 if fieldName.count > 0 
 error = fieldName + " is missing"
 

 if TF1.text?.isEmpty == true
 kAppDelegate.showNotification(text: error)
 return false
 
 if TF1.text?.isValidEmail == false
 kAppDelegate.showNotification(text: errorMsgEmail)
 return false
 
 return true
 
 

 // call this func like this
 // your ViewController 
 var validator:Validators!
 // In viewdidload
 validator = Validators()
 // call this func on button Action
 guard validator.validators(TF1: txtfied,fieldName: "your txtfield name") == false
 else
 
 //do something what you want
 return
 
 // Its works for me hope its works for you

I'd recommend to use a UITextField subclass with 2 UI states (regular / invalid) and a validation rule (e.g. not empty / match regex / etc)

class ValidationTextField: UITextField 

 enum ValidationRule 
 case notEmpty
// case matchRegex(regex: NSRegularExpression)
// ...
 

 var validationRule: ValidationRule?

 private(set) var isValid:Bool = true 
 didSet 
 updateUIForCurrentState()
 
 

 // Call this method on the "next" button click 
 // (or from the delegate on the textFieldDidEndEditing event for early validation)
 func validate() 
 guard let rule = validationRule else 
 // nothing to validate
 return;
 
 switch rule 
 case .notEmpty:
 if let length = text?.count 
 isValid = length > 0
 
 else 
 isValid = false
 
 // process other cases (e.g. matchRegex)
 
 

 /// Configure your state-specific layout here.
 private func updateUIForCurrentState() 
 // Current implementation adds a red border in case of invalid input
 if isValid 
 layer.borderWidth = 0
 layer.borderColor = nil
 
 else 
 layer.borderWidth = 2
 layer.borderColor = UIColor.red.cgColor
 
 

You can use SwiftValidator, It is rule based validator.

let validator = Validator()

 //Register the fields that you want to validate
 validator.registerField(fullNameTextField, rules: [RequiredRule(), FullNameRule()])


@IBAction func signupTapped(sender: AnyObject) 
 validator.validate(self)