Question

I have a subview, called DataViewController, and a parent viewcontroller, called RootViewController.

Everytime is try to call a function or set a property that is defined in my RootViewController, from my subview, I get these errors:

Error:

Terminating app due to uncaught exception
‘NSInvalidArgumentException’, reason: ‘-[UIPageViewController
setDetailsDataObject:]: unrecognized selector sent to instance
0x6aa2df0’

Code:

RootViewController.h:

@property (strong, nonatomic) id detailsDataObject;

DataViewController.m:

((RootViewController *)self.parentViewController).detailsDataObject = self.dataObject;

And…

Error:

Terminating app due to uncaught exception
‘NSInvalidArgumentException’, reason: ‘-[UIPageViewController
showDetails]: unrecognized selector sent to instance 0x6880db0’

Code:

RootViewController.h:

- (void)showDetails;

RootViewController.m:

- (void)showDetails
{
    NSLog(@"Hello");
}

DataViewController.m:

[((RootViewController *)self.parentViewController) showDetails];

Does anyone know how to fix these exceptions?

Answer 1

do an Nsaasert statement to check if the self.parentViewController is actually RootViewController instance

NSAssert([self.parentViewController isKindOfClass:[RootViewController class]], @"Not RootViewController");

Try this..correct if there are any spelling mistakes.