Question

how can i change background image of UIButton when it is clicked and it should remain as it is until another button is clicked.

Answer 1

[myButton setImage:[UIImage imageNamed:@"btn_normal.png"] forState:UIControlStateNormal];
    [myButton setImage:[UIImage imageNamed:@"btn_highlighted.png"] forState:UIControlStateHighlighted];
    [myButton setImage:[UIImage imageNamed:@"btn_highlighted.png"] forState:UIControlStateSelected];
    myButton.showsTouchWhenHighlighted = YES;

Fourth line myButton.showsTouchWhenHighlighted = YES; will do the trick. Please try.