Black screen after load app in IOS

Hy guys I would like to ask for help , because I don’t know what to do .

I am using ionic 1 and cordova in my app but I am having the following error :

When my app complete the splash screen , a black screen appears in IOS . When I turn the mobile in landscape mode the main page appears correctly and everything works ok .

The black screen appears only in the load of the app .

I tested in Android , Safari , Chrome and everything works OK .

But in IOS it does not work . It does not show any errors in debug mode .

Can somebody help me ?