Try programmatically setting:
self.view.frame = [[UIScreen mainScreen] bounds]];
In your ViewController main file.
Otherwise, per this question, try creating a LaunchScreen.xib file if you are using a launch screen, or otherwise:
Go to your Target's settings and choose General, then App Icons and Launch Images. Now set "Launch Screen File" to your "main.storyboard" (or another storyboard if appropriate)