added a placeholder

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

VDS/Components/TextFields/TextArea/TextView.swift

@@ -41,10 +41,23 @@ open class TextView: UITextView, ViewProtocol, Errorable {
     // MARK: - Private Properties
     //--------------------------------------------------
     private var initialSetupPerformed = false
-
+        
     //--------------------------------------------------
     // MARK: - Properties
     //--------------------------------------------------
+    open var placeholder: String? {
+        didSet {
+            placeholderLabel.text = placeholder
+        }
+    }
+
+    open var placeholderLabel = Label().with {
+        $0.textColorConfiguration = ViewColorConfiguration().with {
+            $0.setSurfaceColors(VDSColor.interactiveDisabledOnlight, VDSColor.interactiveDisabledOndark, forDisabled: true)
+            $0.setSurfaceColors(VDSColor.elementsSecondaryOnlight, VDSColor.elementsSecondaryOndark, forDisabled: false)
+        }.eraseToAnyColorable()
+    }
+
     /// Key of whether or not updateView() is called in setNeedsUpdate()
     open var shouldUpdateView: Bool = true
     
@@ -88,6 +101,7 @@ open class TextView: UITextView, ViewProtocol, Errorable {
             if textAlignment != oldValue {
                 // Text alignment can be part of our paragraph style, so we may need to
                 // re-style when changed
+                placeholderLabel.textAlignment = textAlignment
                 updateLabel()
             }
         }
@@ -118,6 +132,9 @@ open class TextView: UITextView, ViewProtocol, Errorable {
         done.pinCenterY()
             .pinTrailing(16)
         inputAccessoryView = accessView
+        
+        addSubview(placeholderLabel)
+        placeholderLabel.pinToSuperView()
     }
     
     @objc func doneButtonAction() {
@@ -145,7 +162,11 @@ open class TextView: UITextView, ViewProtocol, Errorable {
         setNeedsUpdate()
     }
     
-    
+    open override func layoutSubviews() {
+        super.layoutSubviews()
+        placeholderLabel.preferredMaxLayoutWidth = textContainer.size.width - textContainer.lineFragmentPadding * 2
+    }
+
     //--------------------------------------------------
     // MARK: - Accessibility
     //--------------------------------------------------
@@ -297,6 +318,9 @@ open class TextView: UITextView, ViewProtocol, Errorable {
         } else {
             attributedText = nil
         }
+        placeholderLabel.textStyle = textStyle
+        placeholderLabel.isHidden = !text.isEmpty
+        placeholderLabel.surface = surface
     }
 
 }