refactored label to include lineheight and letterspacing

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

VDS/Components/Label/Label.swift

@@ -128,7 +128,7 @@ open class LabelBase<ModelType: LabelModel>: UILabel, ModelHandlerable, ViewProt
             font = TypographicalStyle.defaultStyle.font
         }
         
-        if let attributes = viewModel.attributes, let text =  viewModel.text, let font = font, let textColor = textColor {
+        if let text =  viewModel.text, let font = font, let textColor = textColor {
             //clear the arrays holding actions
             accessibilityCustomActions = []
             actions = []
@@ -137,19 +137,24 @@ open class LabelBase<ModelType: LabelModel>: UILabel, ModelHandlerable, ViewProt
             let startingAttributes = [NSAttributedString.Key.font: font, NSAttributedString.Key.foregroundColor: textColor]
             let mutableText = NSMutableAttributedString(string: text, attributes: startingAttributes)
                
-            //loop through the models attributes
+            //set the local lineHeight/lineSpacing attributes
-            for attribute in attributes {
+            setStyleAttributes(viewModel: viewModel, attributedString: mutableText)
             
-                //add attribute on the string
+            if let attributes = viewModel.attributes {
-                attribute.setAttribute(on: mutableText)
+                //loop through the models attributes
+                for attribute in attributes {
                     
-                //see if the attribute is Actionable
+                    //add attribute on the string
-                if let actionable = attribute as? any LabelAttributeActionable{
+                    attribute.setAttribute(on: mutableText)
-                    //create a accessibleAction
-                    let customAccessibilityAction = customAccessibilityAction(range: actionable.range)
                     
-                    //create a wrapper for the attributes range, block and
+                    //see if the attribute is Actionable
-                    actions.append(LabelAction(range: actionable.range, actionBlock: actionable.action, accessibilityID: customAccessibilityAction?.hashValue ?? -1))
+                    if let actionable = attribute as? any LabelAttributeActionable{
+                        //create a accessibleAction
+                        let customAccessibilityAction = customAccessibilityAction(range: actionable.range)
+                        
+                        //create a wrapper for the attributes range, block and
+                        actions.append(LabelAction(range: actionable.range, actionBlock: actionable.action, accessibilityID: customAccessibilityAction?.hashValue ?? -1))
+                    }
                 }
             }
         
@@ -163,6 +168,30 @@ open class LabelBase<ModelType: LabelModel>: UILabel, ModelHandlerable, ViewProt
         }
     }
     
+    // MARK: - Private Attributes
+    private func setStyleAttributes(viewModel: ModelType, attributedString: NSMutableAttributedString) {
+        //get the range
+        let entireRange = NSRange(location: 0, length: attributedString.length)
+        
+        //set letterSpacing
+        if viewModel.typograpicalStyle.letterSpacing > 0.0 {
+            attributedString.addAttribute(.kern, value: viewModel.typograpicalStyle.letterSpacing, range: entireRange)
+        }
+        
+        //set lineHeight
+        if viewModel.typograpicalStyle.lineHeight > 0.0 {
+            let lineHeight = viewModel.typograpicalStyle.lineHeight
+            let adjustment = lineHeight > font.lineHeight ? 2.0 : 1.0
+            let baselineOffset = (lineHeight - font.lineHeight) / 2.0 / adjustment
+            let paragraph = NSMutableParagraphStyle().with {
+                $0.maximumLineHeight = lineHeight
+                $0.minimumLineHeight = lineHeight
+            }
+            attributedString.addAttribute(.baselineOffset, value: baselineOffset, range: entireRange)
+            attributedString.addAttribute( .paragraphStyle, value: paragraph, range: entireRange)
+        }
+    }
+                
     //--------------------------------------------------
     // MARK: - Actionable
     //--------------------------------------------------