ios - NSArray of Buttons that use Object Data -

i'm not sure if i'm going right way, i'll first explain i'm trying do.

i generating buttons using data array of annotation objects.

i want user able click on button, have textfield appear, , whatever type overwrite text in relevant annotation object , button.

so have buttons being generated annotation data, stuck.

//make button each annotion if x value within 0 - 1400 boundary.     for(annotation * ack in markerpoints)     {         if ([ack x] > 0 && [ack x] < 1401)         {             uibutton * marker = [uibutton buttonwithtype:uibuttontyperoundedrect];              [marker addtarget:self                        action:@selector(markerpressed:)              forcontrolevents:uicontroleventtouchdown];             marker.frame=cgrectmake([ack x],[ack y],100,50);             [marker settitle:[ack textdata] forstate:uicontrolstatenormal ];              [marker settitlecolor:[uicolor blackcolor] forstate:uicontrolstatenormal];             [marker setbackgroundcolor:[uicolor whitecolor]];             [self addsubview:marker ];             [markerbuttonlist addobject:marker];          }     } 

when user presses button, how can tell annotation object related can change annotation textdata?

you can set tag of each button array index value , fetch tag in method when called. example:

//make button each annotion if x value within 0 - 1400 boundary. nsinteger index = 0; for(annotation * ack in markerpoints) {     if ([ack x] > 0 && [ack x] < 1401)     {         uibutton * marker = [uibutton buttonwithtype:uibuttontyperoundedrect];         [marker addtarget:self                    action:@selector(markerpressed:)          forcontrolevents:uicontroleventtouchdown];         marker.frame=cgrectmake([ack x],[ack y],100,50);         [marker settitle:[ack textdata] forstate:uicontrolstatenormal ];         [marker settitlecolor:[uicolor blackcolor] forstate:uicontrolstatenormal];         [marker setbackgroundcolor:[uicolor whitecolor]];         [market settag:index];         [self addsubview:marker ];         [markerbuttonlist addobject:marker];         }     index++; }  -(void)markerpressed:(uibutton*)sender{     annotation * ack_selected = [markerpoints objectatindex:sender.tag]; }