Added iOS version check for crashing code (#6862) fixes #6847

Author: jfversluis

Xamarin.Forms.Platform.iOS/Renderers/PickerRenderer.cs

@@ -81,9 +81,12 @@ protected override void OnElementChanged(ElementChangedEventArgs<Picker> e)
 
 					entry.InputView.AutoresizingMask = UIViewAutoresizing.FlexibleHeight;
 					entry.InputAccessoryView.AutoresizingMask = UIViewAutoresizing.FlexibleHeight;
-					
-					entry.InputAssistantItem.LeadingBarButtonGroups = null;
-					entry.InputAssistantItem.TrailingBarButtonGroups = null;
+
+					if (Forms.IsiOS9OrNewer)
+					{
+						entry.InputAssistantItem.LeadingBarButtonGroups = null;
+						entry.InputAssistantItem.TrailingBarButtonGroups = null;
+					}
 
 					_defaultTextColor = entry.TextColor;