How can UIView access property of UIViewController?

Question

There is a UIViewController, it has an instance variable of NSInteger. I declare it in the UIViewController.h file as:

NSInterger *theNum;
...
@property NSInteger *theNum;

Then, I synthesize it in its .m file:

@synthesize theNum;

The view (UIView) of this UIViewController has a method doSomething that needs to access the value of theNum.

Here is the code in this "view"'s .m file:

-(void)doSomething {

NSInteger *myNum = self.superview.theNum; //error: request for member 'theNum' in something not a structure or union

// do something

}

So, how can I get the value of theNum from UIViewController to its UIView?

Answer 1

You will need to pass the number from the UIViewController to the UIView. The controller should know about the view and not the other way around.

//SomeView.h
@interface SomeView : UIView
NSInteger theNum; 
//You have NSInteger *theNum. I am guessing you made that a pointer by accident
}

@property(assign) NSInteger theNum;

@end

//SomeViewController.m

-(void)viewDidLoad
{
   [super viewDidLoad];
   ((SomeView*)self.view).theNum = theNum;//This theNum belongs to the ViewController
}