Put a Button CGRECT Help

[dimensionequis]

I have this code below, but the button only appears behind the image and just in the first image, how I can put the button over the all images?

- (void)loadView 
{    
    // Step 1: make the outer paging scroll view
	
	CGRect frame = CGRectMake(10, 70, 300, 50);	
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame = frame;	
    [button setTitle:@"Click Me, Please!" forState:UIControlStateNormal];
    button.backgroundColor = [UIColor clearColor];
    button.tag = 2000;
    [button addTarget:self
               action:@selector(buttonClicked:)
     forControlEvents:UIControlEventTouchUpInside];
	
    CGRect pagingScrollViewFrame = [self frameForPagingScrollView];
    pagingScrollView = [[UIScrollView alloc] initWithFrame:pagingScrollViewFrame];
    pagingScrollView.pagingEnabled = YES;
    pagingScrollView.backgroundColor = [UIColor blackColor];
    pagingScrollView.showsVerticalScrollIndicator = NO;
    pagingScrollView.showsHorizontalScrollIndicator = NO;
    pagingScrollView.contentSize = CGSizeMake(pagingScrollViewFrame.size.width * [self pdfPageCount],
    
											  pagingScrollViewFrame.size.height);

	[pagingScrollView addSubview:button];
    pagingScrollView.delegate = self;
    self.view = pagingScrollView;
    
    // Step 2: prepare to tile content
    recycledPages = [[NSMutableSet alloc] init];
    visiblePages  = [[NSMutableSet alloc] init];
    [self tilePages];
}

[newDev]

i think you can exchange the index of the view with the index of the button.
Something like exchangeobjectatindex withobjectatindex.