Set image Button Toggle

hi I would like to ask how I can set the image of the various button2 created from users on my uiview . please help me!!

Code:

Code:
- (void)CREATEBUTTON:(id)sender {
     i++;
UIButton *button2 =[[UIButton alloc] initWithFrame:CGRectMake(100, 80, 55 , 55)];
        NSString* buttonTitle = [NSString stringWithFormat:@"Button%d", i];
        [button2 setTitle:buttonTitle forState:UIControlStateNormal];
        NSString *selectorName = [NSString stringWithFormat:@"SwitchButton%d:", i];
        [button2 addTarget:self action:NSSelectorFromString(selectorName) forControlEvents:(UIControlEvents)UIControlEventTouchDown];
[button2 setBackgroundImage:[UIImage imageNamed:@"OFF.png"]
                        forState:UIControlStateNormal];
 [button2 setBackgroundImage:[UIImage imageNamed:@"ON.png"] forState:UIControlStateSelected];
    buttonToggle = NO;
        [self.view addSubview:button2];

}

- (void)SwitchButton1:(UIButton*)sender
{
	buttonToggle = !buttonToggle;

    if (buttonToggle == YES)
    {
        NSLog(@"1ON");
 }
    else
    {
NSLog(@"1OFF");

    }
}
- (void)SwitchButton2:(UIButton*)sender
{
	buttonToggle = !buttonToggle;

    if (buttonToggle == YES)
    {
        NSLog(@"2ON");
 }
    else
    {       
NSLog(@"2OFF");

    }
}