development: issue-681: Fixed dropshadow - where by default the dropshadow image…

development: issue-681: Fixed dropshadow - where by default the dropshadow image was not being hidden

Sources/iOS/NavigationBar.swift

@@ -289,6 +289,7 @@ open class NavigationBar: UINavigationBar {
      when subclassing.
      when subclassing.
      */
      */
 	open func prepare() {
 	open func prepare() {
+        barStyle = .black
         isTranslucent = false
         isTranslucent = false
         depthPreset = .depth1
         depthPreset = .depth1
         interimSpacePreset = .interimSpace3
         interimSpacePreset = .interimSpace3