CODEWITHSUNDEEP
iosobjective-ciphonexcode
Iqbal Khan
Iqbal Khan

Reputation: 4617

Calling method after checking its existence given error instead of warning

i am calling a method after checking its existence but it is keep giving the error. i am doing all this stuff many times but now it is giving error. any Help 

 if ([[self.navDashBoard.viewControllers lastObject] respondsToSelector:@selector(updateScreenForExtraOption)])
    {
        [[self.navDashBoard.viewControllers lastObject] updateScreenForExtraOption];
    }

PLEASE see my updated image same thing works perfectly at the same class and other method does not. I had not make any Category or ViewController subclass that has refreshPage method in it.

enter image description here

Upvotes: 0

Views: 54

Answers (2)

Peter Segerblom
Peter Segerblom

Reputation: 2823

usually what you see is this:

 if ([[self.navDashBoard.viewControllers lastObject] respondsToSelector:@selector(updateScreenForExtraOption)])
 {
     [[self.navDashBoard.viewControllers lastObject] performSelector:@selector(updateScreenForExtraOption)];
 }

This will give a warning but not a error while calling the method directly will. Or do it the way Paulw11 suggested and cast it to the right type.

Upvotes: 2

Iqbal Khan
Iqbal Khan

Reputation: 4617

i just fixed this issue by importing a class(UIViewController subclass) that has this method declare as public. even i am not using that class.

Upvotes: 0

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