intial date work for input

Signed-off-by: Matt Bruce <matt.bruce@verizon.com>

VDS/Components/TextFields/InputField/InputField.swift

@@ -165,11 +165,12 @@ open class InputField: EntryFieldBase {
         controlStackView.addArrangedSubview(textField)
         
         textField.heightAnchor.constraint(equalToConstant: 20).isActive = true
+        textField.delegate = self
         textField
             .textPublisher
             .sink { [weak self] newText in
                 print("textPublisher newText: \(newText)")
-                self?.text = newText
+                self?.process(text: newText)
                 self?.validate()
                 self?.sendActions(for: .valueChanged)
             }.store(in: &subscribers)
@@ -280,6 +281,7 @@ open class InputField: EntryFieldBase {
         var toolTipModel: Tooltip.TooltipModel? = tooltipModel
         var isSecureTextEntry = false
         var rules = [AnyRule<String>]()
+        var placeholderText: String?
         
         if self.isRequired {
             let rule = RequiredRule()
@@ -326,6 +328,7 @@ open class InputField: EntryFieldBase {
             
         case .date:
             minWidth = 114.0
+            placeholderText = dateFormat.placeholderText
             
         case .securityCode:
             minWidth = 88.0
@@ -364,6 +367,9 @@ open class InputField: EntryFieldBase {
             minWidthConstraint?.isActive = true
         }
         
+        //placeholder
+        textField.placeholder = placeholderText
+        
         //tooltip
         tooltipModel = toolTipModel
     }
@@ -421,6 +427,47 @@ open class InputField: EntryFieldBase {
 
     open var hidePasswordButtonText: String = "Hide" { didSet { setNeedsUpdate() } }
     open var showPasswordButtonText: String = "Show" { didSet { setNeedsUpdate() } }
+    
+    //--------------------------------------------------
+    // MARK: - Date
+    //--------------------------------------------------
+    open var dateFormat: DateFormat = .mmddyy { didSet { setNeedsUpdate() } }
+
+}
+
+extension InputField: UITextFieldDelegate {
+    public func process(text changedText: String) {
+        var newText: String = changedText
+        switch fieldType {
+        case .date:
+            guard newText.count <= dateFormat.maxLength else { return }
+            let numericText = newText.compactMap { $0.isNumber ? $0 : nil }
+            var formattedText = ""
+            
+            for (index, char) in numericText.enumerated() {
+                if (index == 2 || (index == 4 && (dateFormat != .mmyy))) && index < dateFormat.maxLength {
+                    formattedText += "/"
+                }
+                formattedText.append(char)
+            }
+            newText = formattedText
+            
+        default: break
+        }
+    }
+    
+    public func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
+        switch fieldType {
+        case .date:
+            // Allow only numbers and limit the length of text.
+            let allowedCharacters = CharacterSet.decimalDigits
+            let characterSet = CharacterSet(charactersIn: string)
+            return allowedCharacters.isSuperset(of: characterSet) && ((textField.text?.count ?? 0) + string.count - range.length) <= dateFormat.maxLength
+        
+        default:
+                return true
+        }
+    }
 }
 
 extension InputField.FieldType {
@@ -442,3 +489,36 @@ extension InputField.FieldType {
         }
     }
 }
+
+extension InputField {
+    public enum DateFormat: String, CaseIterable {
+        case mmyy
+        case mmddyy
+        case mmddyyyy
+
+        public var placeholderText: String {
+            switch self {
+            case .mmyy: "MM/YY"
+            case .mmddyy: "MM/DD/YY"
+            case .mmddyyyy: "MM/DD/YYYY"
+            }
+        }
+
+        public var formatString: String {
+            switch self {
+            case .mmyy: "MM/yy"
+            case .mmddyy: "MM/dd/yy"
+            case .mmddyyyy: "MM/dd/yyyy"
+            }
+        }
+
+        public var maxLength: Int {
+            switch self {
+            case .mmyy: 5
+            case .mmddyy: 8
+            case .mmddyyyy: 10
+            }
+        }
+
+    }
+}