1. Content layout:
It means Content fit the Screen perfectly i.e, in all iPhone devices so, that user do not scroll left or right. The basic rules for iOS design that mobile app developer Singapore follow are depth, clarity, deference.
Depth: Depth means user navigate through each screen, there should be a sense that they take more detailed content.
Clarity: You would make text size as big as it should be human readable on mobile phone.
Deference: You would make your app design as simple as possible so that there is no compete between images and text.