objective c - Help with setTitle on iOS -

i rookie programming. have entered in following code , app runs without bugs crashes when button pressed. goal identify if button pressed once or twice. if pressed third time, should reset never being pressed.

buttontestviewcontroller.h

#import <uikit/uikit.h>  @interface buttontestviewcontroller : uiviewcontroller { }  -(ibaction)pressbutton:(id)sender;  @end 

buttontestviewcontroller.m

@implementation buttontestviewcontroller   -(ibaction)pressbutton:(id)sender{ static int counter;  if (counter == 0) {     [sender settitle:@"not answered"]; }else if (counter == 1) {     [sender settitle:@"pressed once"]; }else if (counter == 2) {     [sender settitle:@"pressed twice"]; } counter += 1;  if (counter > 2) {     counter = 0; } } - (void)dealloc { [super dealloc]; }  @end 

i change background color of button when pressed , continue errors if use setbackgroundcolor. thank in advance time , consideration.

you need initialize counter. number in legal range of ints how have right now, , changes every time method called.

static int counter = 0; 

also move line outside of method declaration counter isn't reset 0 every time method called. or use instance variable instead of static one. that's should need working.

what error when try use setbackgroundcolor:?

edit

also, if control uibutton, settitle: isn't valid method. check api docs apple. you'd need like:

[[sender titlelabel] settext:@"not answered"];