Fix issue with validation

Author: kpavankotesh

Example/KWVerificationCodeView/VerificationCodeViewController.swift

@@ -21,7 +21,7 @@ class VerificationCodeViewController: UIViewController {
 
     submitButton.isEnabled = false
     verificationCodeView.delegate = self
-    
+
     /* Other available options
 
     verificationCodeView.keyboardType = UIKeyboardType.emailAddress

KWVerificationCodeView.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'KWVerificationCodeView'
-  s.version          = '0.1.7'
+  s.version          = '0.1.8'
   s.summary          = 'A verification code view with validation.'
   s.description      = 'A customisable verification code view with built in validation. Can be used for one time passwords (OTPs), email verification codes etc.'
   s.homepage         = 'https://github.com/keepworks/kwverificationcodeview'

KWVerificationCodeView/Classes/KWVerificationCodeView.swift

@@ -159,7 +159,7 @@ public protocol KWVerificationCodeViewDelegate: class {
 
   public func hasValidCode() -> Bool {
     for textFieldView in textFieldViews {
-      if textFieldView.numberTextField.text?.trim() == nil {
+      if textFieldView.numberTextField.text!.trim() == "" {
         return false
       }
     }