#navigation

Every app has at least one flow - a sequence of screens that allow the user to complete a given task, i.e. read a news article, post a status update, favourite a photo, etc. Most apps have multiple flows. In iOS, we typically represent different flows by placing each flow in a new, self-contained navigation stack, e.g. in Twitter posting a tweet means leaving the feed and opening a model screen where we can compose our tweet. Most apps have a primary flow that the user keeps returning to after they are fini…