differences between xcode interface builder and IOS simulator

Question

I'm new to Xcode and I'm having a problem between interface builder and iphone simulator

As you see below, I set the imageview size for simulator, but some buttons places are changed, button texts disappeared or even buttons disappeared.

http://postimage.org/image/w9ej1c3z1/

I just open a new project and add buttons like the image below, then run the project. Same thing again! I'm doing something wrong?

http://postimage.org/image/6gl55tehd/

xcode version is: 4.5.2

Ios simulator version is 6.0

Answer 1

Please make validate your design by clicking on "Apply retina 4 form Factor" button at the bottom of view controller upon selection...

if you click on that button, It will change to simulator size and you can check the design