Designing app for iOS 7

Deference, clarity and depth are the main themes for iOS 7 development. Focus on core functionalities and content and keep the design simple.

Provide clarity:

1. Use plenty of negative space, negative space make important content more noticeable. 
2. Let color simplify the UI.
3. Ensure legibility by using the system fonts. 
4. Embrace borderless buttons.   

Content is at the heart of iOS 7: 

1. Take advantage of the whole screen, let content extend to the edges.
2. Reconsider visual indicators of physicality and realism, avoid heavy UI elements, keep it simple, focus on content and let the UI have the supporting role. 
3. Let translucent UI elements hint at the content behind them.