How to disable automatic app scaling in iOS 8?

Question

I'm working today with Xcode 6.0 and the iOS 8 simulator to adjust my iOS apps to iOS 8.

The apps are automatically scaled to fit the iPhone 6/6+ screens. I do not want this, I want to arrange myself the display. How can I do that?

Furthermore, when I do this on the iPhone 6 simulator:

NSLog(@"%f",[[UIScreen mainScreen] bounds].size.width);

It returns :

320.000000

What am I missing?

Answer 1

From rckoenes response:

You need to add an iPhone 4.7" and iPhone 5.5" launch screen.

Be careful to the sizes of the launch screens... at this time, with exactly 14 launch screens of different sizes, it's posible to make mistakes...