Question

I’ve got 2 viewControllers:

1. DemoAppViewController
2. AboutViewController

I have an info button in DemoAppViewController which is supposed to open AboutViewController.

At the moment I’m getting a run time error and i can’t seem to work out why..

Here’s the code:

DemoAppViewController .h:

- (IBAction)showInfo;

DemoAppViewController.m:

- (IBAction)showInfo {

    AboutViewController *controller = [[AboutViewController alloc] initWithNibName:@"AboutViewController" bundle:nil];



    //setting style with modalTransition property

    controller.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;



    //show on screen

    [self presentViewController:controller animated:YES completion:nil];

}

When i create the AboutViewController object with initWithNibName xCode adds the following code to AboutViewController.m:

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {

        // Custom initialization

    }

    return self;

}

I’ve left the above untouched.

Runtime error:

[DemoAppViewController showInfo:]: unrecognized selector sent to instance 0x688e450

Can someone tell me where I’m going wrong?
Thanks.

Answer 1

The selector for this method is @selector(showInfo), not @selector(showInfo:). If you assign it programmatically, just correct it. If you use IB – add :(id) sender parameter to the method.