Change Page Control With Button - iphone

Question

I have a simple page control set up with two different pages. I have a button called nextButton, and if the user hits that button, I want to change the page and scroll to the next page.
My page control works, and I can scroll to change pages, but the button does not work at all. It is getting called though.
- (void)viewDidLoad
{
[super viewDidLoad];
self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * TUTORIALNUMBEROFPAGES, self.scrollView.frame.size.height);
self.scrollView.pagingEnabled = YES;
self.scrollView.showsHorizontalScrollIndicator = NO;
self.scrollView.showsVerticalScrollIndicator = NO;
self.scrollView.scrollsToTop = NO;
self.scrollView.delegate = self;
self.pageControl.numberOfPages = TUTORIALNUMBEROFPAGES;
self.pageControl.currentPage = 0;
CGRect pageFrame = self.scrollView.frame;
pageFrame.origin.x = pageFrame.size.width * 0;
pageFrame.origin.y = 0;
self.pageOne.frame = pageFrame;
[self.scrollView addSubview:self.pageOne];
pageFrame.origin.x = pageFrame.size.width * 1;
self.pageTwo.frame = pageFrame;
[self.scrollView addSubview:self.pageTwo];
}
- (void)scrollViewDidScroll:(UIScrollView *)sender
{
if (pageControlUsed) {
return;
}
CGFloat pageWidth = self.scrollView.frame.size.width;
int page = floor((self.scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
self.pageControl.currentPage = page;
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
pageControlUsed = NO;
}
- (IBAction)changePage:(id)sender
{
NSInteger currentPage = self.pageControl.currentPage;
CGPoint offset = CGPointMake(currentPage * self.scrollView.frame.size.width, 0);
[self.scrollView setContentOffset:offset animated:YES];
pageControlUsed = YES;
}
- (IBAction)nextButton:(id)sender
{
[self changePage:self];
}

Answer 1

Try something like this:
- (IBAction)nextPage:(id)sender
{        
    NSInteger currentPage = self.pageControl.currentPage + 1;
CGPoint offset = CGPointMake(currentPage * self.scrollView.frame.size.width, 0);
[self.scrollView setContentOffset:offset animated:YES];
pageControlUsed = YES;
}
- (IBAction)nextButton:(id)sender
{
  [self nextPage:self];
}
Notice the +1 in that code. Before, you were literally setting the content offset exactley equal to the original offset because you were just taking the value of the page control.

Answer 2

You can try with this:
- (IBAction)changePage:(id)sender
{
NSInteger currentPage = self.pageControl.currentPage;
if([sender isKindOfClass:[UIButton class]){
currentPage+=1;
}
CGPoint offset = CGPointMake(currentPage * self.scrollView.frame.size.width, 0);
[self.scrollView setContentOffset:offset animated:YES];
pageControlUsed = YES;
}
- (IBAction)nextButton:(id)sender
{
[self changePage:sender];//if this action is attached just to your button
}