Im having some troubles to start an iOS app using xibs instead of storyboard. The problem is that im getting a black screen and the first view controller is not being called
OK, at last i got it.
What i had to do is just add again
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
After this, just delete the .h, .m and .xib and create them again.
For any reason its working fine now.