Question

I have the following:

  UITapGestureRecognizer *tapGesture;
    SEL sel = @selector(profilePop:withUser:) withObject:tapGesture withObject:message.creator;
    tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:sel];

and I want it to be able to call:

- (void)profilePop:(UITapGestureRecognizer *)recognizer withUser:(Login *)user
{
    //some code here
}

but why isn’t it doing so?

Answer 1

A selector only knows about its name and any parameter names, not its arguments.

UIGestureRecognizer only accepts actions which take in either zero or one argument of its type.

In order to do what you want, you’ll need to write a wrapper method to pass off a Login instance to profilePop:withUser:.

So, you’d write something like this:

UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(profilePopWrapper:)];
[[self view] addGestureRecognizer:tapGesture];
[tapGesture release];


//....

- (void) profilePopWrapper:(UIGestureRecognizer *) gr {
    Login *someUser = ...;
    [self profilePop:gr withUser:someUser];
}