I´ve been checking. I realized that the error is on the login screen. If you log in, the home screen shows it blank. But if you skip the login it loads normal. But this problem just happen on iOS, on Android works fine. Any idea?
I attach some screenshots:
This is the code for the skip logging in button. This just fills variables and navigate to another screen (This is working fine)

And this is the code for the log in button. As you can see, first read firebase database to check the user info (and hide some components), then fills the same variables but using firebase data, and then navigate to another screen (This is not working)
