AppCode 2021.2 Help

Pull members up, push members down

The Pull Members Up refactoring allows you to move class members to a superclass or protocol.

The Push Members Down refactoring helps you clean up the class hierarchy by moving class members to a subclass. The members are then relocated into the direct subclasses only.

  1. Select an item you want to pull up or push down.

  2. From the main or context menu, select Refactor | Pull Members Up or Refactor | Push Members Down.

  3. In the dialog that opens, depending on your refactoring, specify a destination object, members you want to move, and other additional information.

  4. Click Refactor.

Code examples

Pull members up

BeforeAfter
// All methods of the Dog class // will be moved to a superclass // Dog.h @interface Dog : NSObject - (void)run; - (void)eat; @end // Dog.m @implementation Dog { } -(void)run { NSLog(@"I am running"); } - (void)eat { NSLog(@"I am eating"); } @end
// New superclass // Animal.h @interface Animal : NSObject - (void)run; - (void)eat; @end // Animal.m @implementation Animal { } -(void)run { NSLog(@"I am running"); } - (void)eat { NSLog(@"I am eating"); } @end // The Dog class is now a subclass // of the Animal class // Dog.h @interface Dog : Animal @end // Dog.m @implementation Dog { } @end

    Push members down

    BeforeAfter
    // Animal.h @interface Animal : NSObject - (void)meow; - (void)run; - (void)eat; @end // Animal.m @implementation Animal { } // This method will be moved // to a subclass - (void)meow{ NSLog(@"Meow!"); } - (void)run { NSLog(@"I am running"); } - (void)eat { NSLog(@"I am eating"); } @end
    // New subclass // Cat.h @interface Cat : Animal - (void)meow; @end // Cat.m @implementation Cat { } - (void)meow{ NSLog(@"Meow!"); } @end // The Animal class // Animal.h @interface Animal : NSObject - (void)run; - (void)eat; @end // Animal.m @implementation Animal { } - (void)run { NSLog(@"I am running"); } - (void)eat { NSLog(@"I am eating"); } @end
      Last modified: 26 August 2021