title: Trouble Setting Button Image When On a ScrollView
body: <p>I'm making an app. My app is based off this sample project. <a href="https://github.com/yeahdongcn/RSCircaPageControl" rel="nofollow">https://github.com/yeahdongcn/RSCircaPageControl</a></p>
  
  <p>In the app there is a view. On the view, there is a scroll view (UIScrollView *scrollView) which allows to 10 "pages" of content. Within each page, there is another scroll view (UIScrollView *sv) which is a subview of *scrollView. </p>
  
  <p>On SV, I then added a button called UIButton *button. When I attempt to change the button's images after a time of "two minutes," nothing happens. This is because there are 10 buttons. I need to change the image of the button on only <em>one</em> of the pages. Not all of them. </p>
  
  <p>Something tells me it needs "object at index" or something to specify which button on which page I want to change. </p>
  
  <p>The code is below! Thanks guys!</p>
  
  <pre><code>- (void)viewDidLoad
  {
  [super viewDidLoad];
  
  self.clipView = [[RSView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height)];
  self.clipView.clipsToBounds = YES;
  [self.view addSubview:self.clipView];
  
  self.scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.clipView.bounds.size.width, kScrollViewHeight)];
  self.scrollView.delegate = self;
  self.scrollView.clipsToBounds = NO;
  self.scrollView.pagingEnabled = YES;
  self.scrollView.showsHorizontalScrollIndicator = NO;
  self.scrollView.showsVerticalScrollIndicator = NO;
  self.scrollView.autoresizingMask = UIViewAutoresizingFlexibleWidth;
  [self.view addSubview:self.scrollView];
  self.clipView.scrollView = self.scrollView;
  
  self.pageControl = [[RSCircaPageControl alloc] initWithNumberOfPages:10];
  CGRect frame = self.pageControl.frame;
  frame.origin.x = self.view.bounds.size.width - frame.size.width - 10;
  frame.origin.y = roundf((self.view.bounds.size.height - frame.size.height) / 2.);
  self.pageControl.frame = frame;
  self.pageControl.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin;
  [self.pageControl setCurrentPage:0 usingScroller:NO];
  [self.view addSubview:self.pageControl];
  
  CGFloat currentY = 0;
  for (int i = 0; i &lt; 10; i++) {
      UIScrollView *sv = [[UIScrollView alloc] initWithFrame:CGRectMake(0, currentY, self.scrollView.bounds.size.width, kScrollViewHeight)];
      sv.tag = kScrollViewTagBase + i;
      sv.delegate = self;
      sv.autoresizingMask = UIViewAutoresizingFlexibleWidth;
      sv.backgroundColor = [UIColor colorWithRed:(arc4random() % 257) / 256. green:(arc4random() % 257) / 256. blue:(arc4random() % 257) / 256. alpha:1];
  
  
  
     ///here's the buttton!!
  
  
     UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
     UIImage*normal = [UIImage imageNamed:@"girl.jpg"];
    UIImage*selected = [UIImage imageNamed:@"girl2.jpg"];
      button.frame = CGRectMake(100, 100, 50,50));  
      [button setImage:normal forState:UIControlStateNormal];
      [button setImage:selected forState:UIControlStateHighlighted];
      button.contentMode = UIViewContentModeScaleAspectFit;
      [button addTarget:self
                 action:@selector(myButtonPressed:)
       forControlEvents:UIControlEventTouchDown];
      [sv addSubview:button];    //notice that the button is added as a subview of SV
  
      [self.scrollView addSubview:sv];  // notice that SV is a subview of the scrollView.
  
  
      if (i == 2 || i == 6) {
          sv.contentSize = CGSizeMake(sv.contentSize.width, kScrollViewContentHeight);
      }
  
  
  
      currentY += kScrollViewHeight;
  }
  
  self.scrollView.contentSize = CGSizeMake(self.scrollView.contentSize.width, currentY);
  
    [self performSelector:changeButtomImages withObject:nil afterDelay:TwoMinutes];
  
  }
  
  - (void)changeButtonImages {
  
      UIImage*normal2 = [UIImage imageNamed:@"boy.jpg"];
      UIImage*selected2 = [UIImage imageNamed:@"boy2.jpg"];
      [button setImage:normal2 forState:UIControlStateNormal];
      [button setImage:selected2 forState:UIControlStateHighlighted];
  } 
  </code></pre>
  
  <p>Kyle  </p>