Use boolean for .visible on iOS

Author: bootstraponline

lib/appium_lib/ios/patch.rb

@@ -16,15 +16,16 @@ def type text
       end
 
       # returns if the element is visible
-      # 1 = visible
-      # 0 = not visible
-      # null = unknown
+      # true: 1 = visible,
+      # false: 0 = not visible, null = unknown
+      #
       # http://developer.apple.com/library/ios/#documentation/ToolsLanguages/Reference/UIAElementClassReference/UIAElement/UIAElement.html#//apple_ref/doc/uid/TP40009903
       def visible
         js = <<-JS
           au.getElement('#{self.ref}').isVisible();
         JS
-        @driver.execute_script js
+        result = @driver.execute_script js
+        result == 1 ? true : false
       end
     end
   end