I want to update my app for the new iPhone 6 and iPhone 6 Plus. To do so I selected an image set from my asset catalog in Xcode 6. As I develop only for iPhone I selected "Device Specific" in the Xcode Attribute Inspector. Now I can chose between the following devices:
Selecting only iPhone I get these sizes:
Selecting only Retina 4-inch gives me only one size:
Why is the 4-inch screen different from 3.5, 4.7 and 5.5 inches? It would make sense in my view to combine 1x and 2x as they are both available on devices with a 4:3 aspect ratio and Retina 4 2x and 3x for devices with a 16:9 aspect ratio.
My real question: What do I need to provide in order to support iOS 7.0 and later? I obviously don't need a 1x image as my app does not support any non-retina devices. 2x seems reasonable for the iPhone 4s. Do I need Retina 4 2x if I provide 2x already? Will the iPhone 6 use the 2x or the Retina 2x? 3x is for the iPhone 6 Plus, no question about that.
Thanks for your help.