在有导航控制器的UIviewController中添加tabbarController的最佳方法?

Just wandering that we can't add the tab bar controller in a uiviewcontroller in between of the app. What is the best way to implement such kind of UI where you need tab bar in between of any controller within the app and rest of other app is without tab bar. I tried to add a tab bar controller in between of the app but the controller which are being added in the tab bar items just lost few functionality like : not able to add button on them and they are not showing the navigation bar title which are being added on the tab bar controller. Just wandering that we can't add the tab bar co