Understanding Projects and Files
When you create or open a project, Xcode displays the project in a single window view. This view has panes on the right, left, and bottom, which you can choose to show or hide. It also has an always-visible content area at the center, and all of the essential tools for building, running, and managing the window are located in a toolbar at the top. The figure shows this arrangement.
To quickly recap, here are the major regions of the Xcode project window:
Toolbar: Contains build and run buttons, the scheme selector—used to determine which target to build, and for what destination (e.g., a device or the simulator), ...