1. An iOS app includes a window. But—unlike a window in a computer app—an iOS window has no visible parts and it can’t be moved to another location on the display. Most iOS apps contain only one window; apps that support an external display can have more than one.
2.Avoid associating different actions with the standard gestures. Unless your app is a game, redefining the meaning of a standard gesture may confuse people and make your app harder to use.
3. Incorporate a brand’s assets in a refined, unobtrusive way. People use your app to get things done or be entertained; they don’t want to feel as if they’re being forced to watch an advertisement. For the best user experience, you want to quietly remind users of the brand identity through your choice of font, color, and imagery.
#2 is incredibly important. People have expectations for their iOS/Android apps because they’ve used to many other ones. Unless you have a compelling reason, it’s best to use the expected behavior.