Sometimes you want to change the appearance of the Navigation Bar across the application. This is what we did in our iKite Size application. To do that just add to your app delegate the following lines. The image we used was 320×44 and 640×88 (@2x retina), this size will totally cover the navigation bar.
The first time I tried to add an icon for one of the iOS bar, I told my graphic designer (9am) to create an nice icon with this shine and the other drop, etc. They came back with very nice little icons, but to my surprise the icon were not working. I was getting a
All sizes quoted are for the retina display, so files should end with “@2x”. Then a resize app can be used to create images for non-retina devices. I personally prefer resizer app, it is free and totally simple to use, just drag the pictures you want to resize, select the folder and you are done.