Architecture

The PhotoEditor SDK for iOS is structured into two main components:

Backend

The SDKs backend takes care of all image processing and rendering. This includes live filters, any adjustments made by the user and the final image export. All image modifications, that have currently been applied to the image, are stored in a PhotoEditModel. This model is used to determine if a new rendering pass is necessary and holds all values.

Frontend

The frontend contains all UI elements including the PhotoEditToolController, which is the base class for all tools, the StackLayoutToolController, which is a subclass of PhotoEditToolController and lays out its views into the top workspaceView and the bottom accessoryView, which is used for the menu. It also contains the CameraViewController and PhotoEditViewController classes, which represent the root view controllers and the ToolbarController, which is used to handle the transitions between the editor and its tools.

All tools described in the Features section are implemented as PhotoEditToolController subclasses and are managed by the ToolbarController. The UI configuration is implemented using the Configuration class and their subclasses, as described in the configuration section.