First thing is that you must add the required default image for 4 inch screen display. Check Properly in you project have image with name Default-568h@2x.png (640 × 1136 pixels)
This Default-568h@2x.png is Necessary for Support app in 4 inch Screen display
Ones you add this image in to you working Project, Remove old Build from device or Simulatore, clear Project and re build and check Hope you issue will solve.
Edit:-
After fix the black Bar issue you can check the device like my answer Give here check this:-
Detect device type
you have two choice if you can’t use AutoLayout
First
Create two xib with same class one for 3.5 inch screen and one for 4 inch screen set using macro with checking which screen appear.
Second
Set Self.view frame using macro with checking which screen appear.
There are also other methods you can use for set self.view frame as using window frame or UIScreen