Understanding about xcode refactoring options

Rename: Rename the identifier to ensure better code readability. The identifier includes the name of a class, method, or function.

Extract: extract the code you selected in xcode to a new method or function.

Create superclass: defines the parent class for the currently selected class in xcode

Move up: Move the selected method, attribute, or instance variable from a class to its parent class. Both the subclass and parent classes are defined in the project.

Move down: opposite to move up, it moves the selected Identifier from the parent class to the subclass. Both the parent class and the subclass are defined in the project.

Encapsulate: encapsulate an instance variable and create an appropriate accessor for it

Convert to objective-C arc (converted to OC arc): a tool used to convert old projects so that they can apply automatic reference counting.

Convert to modern objective-C syntax (converted to the new OC syntax): a tool to replace code with the new OC feature.

Understanding about xcode refactoring options