ios - Trying to call a (void) method from another class

Question

I am trying to call a (void) method from another class, the class is ViewController.h & .m in the ViewController.h file I have;

-(void)showMore;

and in the ViewController.m file I have

-(void)showMore {

    //my stuff to show in here
}

I am calling it from a BoothViewController using this method;

ViewController *app = (ViewController *)[[UIApplication sharedApplication] init];
        [app showMore];

It does not show any errors in code, however it crashes during testing with an unrecognised selector.

I also tried with no success;

ViewController *app = (ViewController *) [ViewController init];
        [app showMore];

Any help would be much appreciated! :)

Answer 1

You have to allocate and init your view controller before sending messages to it:

ViewController *myViewController = [[ViewController alloc] init];
[myViewController showMore];

Or if the View controller is the app rootViewController:

ViewController *myViewController = (ViewController*)[UIApplication sharedApplication].delegate.window.rootViewController;
[myViewController showMore];