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I am getting a warning on this line in my header, but I am using the class variable in my implementation (in both class methods and instance methods):
#import <UIKit/UIKit.h>
static NSMutableArray *classVar; // Xcode warning: 'classVar' defined but not used
@interface MyViewController : UIViewController {
This variable is not a class/instance variable. Each time when the header file is included to .m file, the compiler creates a new static variable with scope limited to the file that includes this header. If you’re trying to get a class level variable, move the declaration to the beginning of respective .m file.