iphone - Custom actions for UIGestureRecognizers (with custom parameters) -

short version of problem:

i cannot figure out how make "action" uitapgesturerecognizer take additional parameters, , use them.

here's rundown of problem:

i trying make ipad app records (with nslog) coordinates of uitouch occurs whenever press 1 of app's uibuttons. location of touch needs relative button touched.

what i've done:

i have implemented uitapgesturerecognizer , added each of buttons. problem action use, since needs dynamic each , every button.

i have code:

 uitapgesturerecognizer *iconclickrecognizer = [[uitapgesturerecognizer alloc] initwithtarget:self action:@selector(logicon:withtag:)];  [iconclickrecognizer setnumberoftapsrequired:1];  [iconclickrecognizer setnumberoftouchesrequired:1];  [iconclickrecognizer setdelegate:self];  [[self.view viewwithtag:1] addgesturerecognizer:iconclickrecognizer];   [iconclickrecognizer release]; 

when know works, use for-loop add iconclickrecognizer of buttons tag.

the logicon:(int)withtag method shown here:

-(void)logicon:(uigesturerecognizer *)gesturerecognizer withtag:(int)tag {   nslog(@"tag x: %f", [gesturerecognizer locationinview:(uiview*)[self.view viewwithtag:tag]].x);   nslog(@"tag y: %f", [gesturerecognizer locationinview:(uiview*)[self.view viewwithtag:tag]].y); } 

what isn't working:

when hard-code tag logicon method, records information correctly. however, i not know how make method dynamic, , use "tag" parameter.

any appreciated.

thanks, alex

the docs uigesturerecognizer class specify action must of form:

- (void)handlegesture; - (void)handlegesture:(uigesturerecognizer *)gesturerecognizer; 

not form of:

- (void)logicon:(uigesturerecognizer *)gesturerecognizer withtag:(int)tag 

so ask gesturerecognizer on whole window, compare buttons, or walk through buttons , ask gesture respect each button.

probably best subclass uibutton , make each button target; know view you're in.