Question

this is my protocol.

@protocol UCMapviewDelegate <NSObject>
@required
- (void)slideMapviewIn:(id)sender;
- (void)slideMapviewOut:(id)sender;


@end

This is were the methods should get called (In UCMapViewController.m). showMenu gets called from a button

- (void)showMenu
{
    // TODO: 
    if (self.isMapViewPushedAside) {
        [self.delegate slideMapviewOut:self];
    } [self.delegate slideMapviewIn:self];

}

And this is were the delegate is initialized. initializer for a UCMapViewController object.

- (id)initWithDelegate:(UCRootViewController *)controller
{
    self = [super init];
    if (self) {
        // Custom initialization
        self.delegate = controller;
    }
    return self;
}

but when I want to use the delegate to call it, I get the error: No known instance method for selector 'slideMapviewIn:'. what can I do about this?

Answer 1

Your problem is that you are not declaring your delegate as implementing that protocol. If you don’t do that, how is it supposed to know that it implements that protocol? That error is natural.

You must declare it as id<UCMapviewDelegate> and to do that you must import the header that contains that protocol.