AppCode 2023.1 Help

Extract instance variable

With the Extract Instance Variable refactoring, you can place an expression into an instance variable.

The refactoring is available for Objective-C only.

Extract instance variable

Perform the Extract Instance Variable refactoring

  1. In the editor, select an expression you want to replace with an instance variable.

  2. Press Ctrl+Alt+F or select Refactor | Extract/Introduce | Instance Variable from the main or context menu.

  3. If there are several expressions available for extracting, select the required one from the list that opens and press Enter.

  4. Select a name for the instance variable from the list of suggestions that opens or type a new one.

  5. If you want to create a property for the variable or declare it in the interface, select the corresponding checkboxes in the popup that opens.

  6. Press Enter.

Code example



@implementation LoginViewController { } - (void)performLogin { // ... [self.loginModel loginWithEmail:email password:password completion:^(BOOL success) { // success will be extracted to // an instance variable if (success) { [self showAlertLoginSuccess]; } else { [self showAlertLoginFailed]; } }]; }
@implementation LoginViewController { // Extracted instance variable BOOL _loginSuccessful; } - (void)performLogin { // ... [self.loginModel loginWithEmail:email password:password completion:^(BOOL success) { _loginSuccessful = success; if (_loginSuccessful) { [self showAlertLoginSuccess]; } else { [self showAlertLoginFailed]; } }]; }
    Last modified: 14 December 2022