Question

I want to use an static function from a protocol in a function:

    @implementation IPadPanoramaViewController
    - (void)viewDidLoad
    {
     [self.view addSubview:[PanoramaContent getPanoramaContentByPanoramaItem:[[PanoramaListItem alloc] init]]; 
     [super viewDidLoad];
}
@end

        @protocol PanoramaItemProtocol

        + (UIView *) getPanoramaItemBySection;

        @end


        @implementation PanoramaContent
    + (UIView *) getPanoramaContentByPanoramaItem:(id<PanoramaItemProtocol>) itemKind {

                return [itemKind getPanoramaItemBySection]; //here is the problem "unrecognized selector sent to instance"
        }
    @end

I wish “PanoramaListItem” don’t be a NSObject

Answer 1

The problem is that you’ve defined getPanoramaBySection to be a class method, when you’re calling it on an instance. In the protocol declaration, replace the + with a -.