objective c - iOS - method (in another class) executed twice -

i'm calling appcontroller viewcontroller upon viewdidload

@implementation viewcontroller     - (void)viewdidload { [super viewdidload];         nslog(@"viewdidload");         [appcontroller initialize];     } @end  @implementation appcontroller     + (void)initialize {         nslog(@"initialize");     } @end 

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i expected initialize executed once. but, seen in console, it's executed twice.

is bug or missing something?

+ (void)initialize method called objective-c runtime first time class referenced.

you should never call yourself, , never call super.

if you're looking setup on data controller override init.

here's similar answer