与Skype应用程序一样，如何在前台状态下正在进行的呼叫中显示顶栏状态栏

Here is requirement to show green top bar to indicate audio/video call is on in app foreground state. On action of top bar tap action, should back to calling window. Is there any api available in iOS sdk to do same. Please suggest your response would be very helpful for me. Thanks in advance.Here is requirement to show green top bar to in