# Black screen issue

**URL:** <https://devforum.zoom.us/t/black-screen-issue/2515>\
**Category:** iOS\
**Created:** [November 6, 2018, 6:23am UTC](https://devforum.zoom.us/t/black-screen-issue/2515 "2018-11-06T06:23:14Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Michael\_Yuen](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/michael_yuen/32/114_2.png) [@Michael\_Yuen](https://devforum.zoom.us/u/Michael_Yuen)\
**Post date:** [November 6, 2018, 6:23am UTC](https://devforum.zoom.us/t/black-screen-issue/2515/1 "2018-11-06T06:23:14Z")

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hi,

I’m facing with the problem with mobilertc on iOS with latest [zoom.us](http://zoom.us) SDK

In our application, we customized a view controller then set it to MobileRTC.share.rootViewController.

each time enter meeting view, we create a new customized view controller then set to MobileRTC.

1st time running from launch is fine, video and audio are good.

2nd time running without closing app and launch again, audio fine, but no video, no Zoom UI Control.

We’re using Xcode 10, target to iOS 11+

Please help.

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**Author:** ![Chao\_Bai](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/chao_bai/32/60_2.png) [@Chao\_Bai](https://devforum.zoom.us/u/Chao_Bai)\
**Post date:** [November 7, 2018, 1:19am UTC](https://devforum.zoom.us/t/black-screen-issue/2515/2 "2018-11-07T01:19:30Z")

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- (void)setMobileRTCRootController:(UINavigationController\*)navController

The param here is one kind of&nbsp;UINavigationController. Your customized view controller is one&nbsp;UINavigationController instance?

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**Author:** ![DeveloperBot](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/developerbot/32/12632_2.png) [@DeveloperBot](https://devforum.zoom.us/u/DeveloperBot)\
**Post date:** [August 21, 2020, 5:58pm UTC](https://devforum.zoom.us/t/black-screen-issue/2515/3 "2020-08-21T17:58:56Z")

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