How can i maintain the selected state in button in iPhone - iphone

Question

I have created scroll view and sets the buttons are in the scroll view. The Buttons are scrolling horizontally and it works fine. If i clicked the button, i set background image as "Selected State" in button. My problem is how can i changed the selected state in different button, when clicking it and how can i deselected the "selected state" button when clicking the another button.
I have three buttons in the scroll view,
-(IBAction) Button1 : (id) sender
{
// btn1.selected = YES;
[btn1 setImage:[UIImage imageNamed:#"first.png"] forState:UIControlStateSelected];
}
-(IBAction) Button2 : (id) sender
{
// btn2.selected = YES;
[btn2 setImage:[UIImage imageNamed:#"second.png"] forState:UIControlStateSelected];
}
-(IBAction) Button3 : (id) sender
{
// btn3.selected = YES;
[btn3 setImage:[UIImage imageNamed:#"three.png"] forState:UIControlStateSelected];
}
see the below image,(Health, Entertainment and Money Watch are the three buttons)
Image http://www.freeimagehosting.net/uploads/6b3daab12f.png
and
Img http://www.freeimagehosting.net/uploads/b6e0f234dc.png
Note:(Like, Tabbar and Segmented control)
On clicking first button and sets background image in selected state and clicking the second button, then first buttons are to be deselected. So how can i maintain the selected state, till another button is clicked.
Thanks in Advance.

Answer 1

I solved this task in the following way:
init method:
Create number of buttons with defined images for normal and selected state.
Assign tag for each button (for example, for i'th button tag is 1000+i).
Assign IBAction for each button.
action method:
Remove selection from previously selected button (search it by it's tag with [view viewWithTag:] method)
Select sender.
Save sender's tag.
Here's the code:
- (void)init {
....INITIALIZE SCROLLVIEW HERE.....
for ( int i = 0; i < 10; i++ ) {
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
[btn setFrame:.....];
[btn setImage:_IMAGE_ forState:UIControlStateNormal];
[btn setImage:_IMAGE2_ forState:UIControlStateSelected];
[btn setTag:i + 1000];
[btn addTarget:self action:#selector(setSelectedButton:) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:btn];
}
}
- (IBAction)setSelectedButton:(id)sender {
[self setSelectedButtonByIndex:((UIButton *)sender).tag - 1000];
}
- (void)setSelectedButtonByIndex:(NSInteger)index {
if ( selectedElemId >= 0 ) {
UIButton *btn = (UIButton *)[self viewWithTag:selectedElemId + 1000];
[btn setSelected:NO];
}
UIButton *btn = (UIButton *)[self viewWithTag:index + 1000];
[btn setSelected:YES];
selectedElemId = btn.tag - 1000;
}