Question

I have a subview which is allmost half to my mainview and also I have a UISlider on my mainview . My silder has a value from 0 to 10. i want to add some UIButtons to my Subview with the UISilder.Now if my silder get the value 2 then i want to add 2 UIButtons to my Subview as if my silder pass the value 2 and gets the value 4 then I want to remove the previous UIButtons from Subview and Add some new UIButtons to Subview .

Answer 1

Note: The code is untested.

1. Initiate a 10 UIButton and add them to the view, set them as hidden:

   for (int x = 0; x < 10; x++) {
       UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(50, x * 100, 100, 50)];
       [btn setText:[NSString stringWithFormat:@"Button %d",(x + 1)]];
       [btn setHidden:true];
       [self.view addObject:btn];
       [btn release];
   }
   

2. Use the slider change value method to hide/show the buttons like this:

       -(IBAction) sliderChanged:(id) sender{
             UISlider *slider = (UISlider *) sender;
             for (int x = 0; x < slider.value; x++) {
                  UIButton *btn = (UIButton *)[savedBtn objectAtIndex:x];
                  [btn setHidden:false];
             }
       }
   

Update

To use a UIScrollView, you have to add the UIButtons to the scrollView instead of the view, like this:

    UIScrollView *sView = [[UIScrollView alloc] initWithFrame:CGRectMake(10,10,200,200)];
    [sView setDelegate:self];
    for (int x = 0; x < 10; x++) {
        UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(50, x * 100, 100, 50)];
        [btn setText:[NSString stringWithFormat:@"Button %d",(x + 1)]];
        [btn setHidden:true];
        [sView addSubview:btn];
        [btn release];
    }

then add the scrollView to the view:

     [self.view addSubview:sView];

hope this can help you.