ios - Point to Point Animation -

http://postimg.org/image/8bwxdp4bj/7124c28f/ want make animation shown in above image .i using code .they became move infinity , view not appear because involved in loop. newer in ios . please help.what stuck.any appreciated.

for (i=0; i<3; i++) {         if (i==0) {            first.backgroundcolor=[uicolor blackcolor];            second.backgroundcolor=[uicolor yellowcolor];             third.backgroundcolor=[uicolor yellowcolor];             button.backgroundcolor=[uicolor yellowcolor];             i=1;         }         if (i==1) {             first.backgroundcolor=[uicolor yellowcolor];             second.backgroundcolor=[uicolor blackcolor];             third.backgroundcolor=[uicolor yellowcolor];             button.backgroundcolor=[uicolor yellowcolor];             i=2;        }         if (i==2) {             first.backgroundcolor=[uicolor yellowcolor];             second.backgroundcolor=[uicolor yellowcolor];             third.backgroundcolor=[uicolor blackcolor];             button.backgroundcolor=[uicolor yellowcolor];             i=3;         }        if (i==3) {             first.backgroundcolor=[uicolor yellowcolor];             second.backgroundcolor=[uicolor yellowcolor];            third.backgroundcolor=[uicolor yellowcolor];             button.backgroundcolor=[uicolor blackcolor];             i=0;         }     } 

firstly make global variable keeps track of button's background changed , array stores buttons.

@interface classname() {     int index = 0;     nsarray *buttons; } 

now in initialization method, this

[first setbackgroundcolor:[uicolor yellowcolor]]; [second setbackgroundcolor:[uicolor yellowcolor]]; [third setbackgroundcolor:[uicolor yellowcolor]]; [button setbackgroundcolor:[uicolor yellowcolor]]; buttons = @[first, second, third, button]; [self performselector:@selector(changecolor) withobject:nil afterdelay:1.0f]; 

now in changecolor method, this

- (void)changecolor {      uibutton *btn = [buttons objectatindex:index];     [btn setbackgroundcolor:[uicolor blackcolor]];      uibutton *prevbtn = [buttons objectatindex:((index - 1) + 4) % 4];     [prevbtn setbackgroundcolor:[uicolor yellowcolor]];      index = ++ index % 4;     [self performselector:@selector(changecolor) withobject:nil afterdelay:1.0f]; }