Update host-config.md (#248)

* Update host-config.md * updated native styling information for ios
MicrosoftDocs · Jan 21, 2020 · db6d3bb · db6d3bb
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diff --git a/AdaptiveCards/sdk/rendering-cards/ios/host-config.md b/AdaptiveCards/sdk/rendering-cards/ios/host-config.md
@@ -29,4 +29,12 @@ ACRRenderResult *renderResult;
 renderResult = [ACRRenderer render:cardParseResult.card
                             config:hostconfigParseResult.config
                    widthConstraint:300.0];
-```
+```
+
+## Customization
+
+There are 3 ways to customize the adaptive card rendering:
+
+1. Host Config
+2. XIB
+3. Custom element rendering
diff --git a/AdaptiveCards/sdk/rendering-cards/ios/native-styling.md b/AdaptiveCards/sdk/rendering-cards/ios/native-styling.md
@@ -8,4 +8,33 @@ ms.topic: article
 
 # Native styling - iOS
 
-Not supported.
+Use XIB for fine-grained styling.
+
+The following XIBs exist
+
+| XIB | Usage |
+|---|---|
+| ACRButton.xib | buttons |
+| ACRCellForCompactMode.xib   | ChoiceSet compact mode|
+| ACRDatePicker.xib | DatePicker for Input.Date |
+| ACRDateTextField.xib  | TextField for Input.Date |
+| ACRInputTableView.xib   | Container for Inputs |
+| ACRLabelView.xib  | TextBlock |
+| ACRPickerView.xib | ChoiceSet |
+| ACRQuickActionMultilineView.xib  | Quick Actions with multilines |
+| ACRQuickActionView.xib | Quick Actions |
+| ACRTextField.xib | Input |
+
+XIB can be edited through XCode IB.
+Once XIBs are edited to the specification.
+From a terminal
+```
+ibtool --compile name.nib name.xib 
+```
+
+For example, to style a button
+```
+ibtool --compile ACRButton.nib ACRButton.xib 
+```
+
+The generated nib files can be then replaced at AdaptiveCards.framework