It's called a "qualified superclass constructor invocation". Citing from here:…

Question

Asked: May 13, 20262026-05-13T14:29:36+00:00 2026-05-13T14:29:36+00:00

//root controller class subviewcontroller; @rootviewcontroller:UIViewController { NSInteger a; } call a in subviewcontroller super.a=1;

//root controller
class subviewcontroller;
@rootviewcontroller:UIViewController
{
   NSInteger a;
}

call a in subviewcontroller
super.a=1;

system reported:

error：Request for member ‘a' in something not a structure or union

welcome any comment

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Editorial Team · Answer 1 · 2026-05-13T14:29:36+00:00

Editorial Team

You nee to make it a property and synthesize it.
like:

In the header file

@property(nonatomic, assign)  NSInteger a;

and in the implementation file:

@synthesize a;