Question

I have dynamically created some list of RadioButtons with some values. pro grammatically I changed the button state and changed the image for selected and unselected. but the problem is i can select the all radioButtons at same time. actually I need to select one at a time.
when I clicked the next RadioButton, previously selected button state should be changed to non-selected.

Here is my code, I tried with changing image, but …some problem with my code.

   RadioButton = [UIButton buttonWithType:UIButtonTypeCustom];
   [RadioButton setFrame:CGRectMake(0.0f, 0.0f, 20, 20)];
   [RadioButton setCenter:CGPointMake(116.0,p1)];
   [RadioButton setSelected:NO];
   [RadioButton setImage:[UIImage imageNamed:@"uncheck.png"] forState:UIControlStateNormal];
   [RadioButton addTarget:self action:@selector(RadioButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
   [self.scrollView addSubview:RadioButton];




  -(void)RadioButtonTapped:(id)sender
    {


       UIButton *RadioButton1 = (UIButton*)sender ;

      [self radiobuttonAction:RadioButton1];
    }

 -(void)radiobuttonAction:(UIButton *)Button
    {

       if(![Button isSelected])
         {


            [Button setSelected:YES]; 
            [Button setImage:[UIImage imageNamed:@"radio_active.png"] forState:UIControlStateSelected]; //not working, button image is not changing 
        } 
     else
        { 
            [Button setSelected:NO]; 
            [Button setImage:[UIImage imageNamed:@"radio_inactive.png"] forState:UIControlStateNormal];
        }


 }

where can I change the image of previously selected button.

thanks in advance

Answer 1

Deselect all the buttons when you select one. If you have buttons in your scroll view you can user this code:

//Your Method
-(void)RadioButtonTapped:(id)sender
{
  UIButton *RadioButton1 = (UIButton*)sender;
  [self deselectAll];
  [self radiobuttonAction:RadioButton1];      
}

- (void) deselectAll : (UIScrollView *) scrollView{
  NSArray *viewArray = [scrollView subviews];
  for (UIView *v in viewArray){
  if([v isKindOfClass:[UIButton class]]){
        [((UIButton *)v) setSelected:NO];
  }
 }
}

EDIT: But if you want to give it real radio button effect (in which one is always selected, and only one is selected) it will be more easy to you. Use following code:

 //A globle refButton
  UIButton *refButton = nil;
 //Set image for both state:
[RadioButton setImage:[UIImage imageNamed:@"uncheck.png"] forState:UIControlStateNormal];
[RadioButton setImage:[UIImage imageNamed:@"check.png"] forState:UIControlStateSelected];

 //make any of above default select: may be the last one and pass that to `refButton`
 refButton = RadioButton;



 //Your Method
-(void)RadioButtonTapped:(id)sender
{
  [refButton setSelected:NO];
  refButton = (UIButton*)sender;
  [refButton setSelected:YES];      
}