iphone - How do I get a UIButton to change its color by clicking it? -

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i want make app iphone. nonogram similar this: http://www.puzzle-nonograms.com/ how can make uibuttons changes color white black , reverse?

.h file

uibutton *button; bool clicked;

.m file - (void)viewdidload

{     [super viewdidload];     // additional setup after loading view, typically nib.      clicked=yes;     button = [uibutton buttonwithtype:uibuttontyperoundedrect];     [button addtarget:self                action:@selector(changebtncolor)      forcontrolevents:uicontroleventtouchdown];     [button settitle:@" 1 " forstate:uicontrolstatenormal];     button.frame = cgrectmake(80.0, 210.0, 160.0, 40.0);     [button settitlecolor:[uicolor graycolor] forstate:uicontrolstatenormal];     [self.view addsubview:button]; }  -(void)changebtncolor{     if (clicked) {             [button settitlecolor:[uicolor redcolor] forstate:uicontrolstatenormal];         clicked=no;     }     else{         [button settitlecolor:[uicolor graycolor] forstate:uicontrolstatenormal];         clicked=yes;      }    }

i hope help. best of luck..


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