The "Notes" example app demonstrate ObjectBox's Swift API. The example comes with two apps: one for iOS and one for macOS. The iOS example is a full GUI application, whereas the macOS example runs a few operations and then exits.
Just like in any other project, you need to set up CocoaPods and ObjectBox.
Simply run ./setup.sh inside this directory, or run these commands in a terminal:
pod install --repo-update # if that fails, update CocoaPods (see Installation)
Pods/ObjectBox/setup.rb
This will generate a NotesExample.xcworkspace that you can launch to try out ObjectBox.