How To Scroll To A Position Programmatically in UIScrollView?

UIScrollView is one of the most important and useful controls in iOS. It is the basis for the very popular UITableView and is a great way to present content larger than a single screen.

You must set the contentSize property to the size of the scrollable content. This specifies the size of the scrollable area

1.How to scroll a UIScrollView programmatically in iOS?
Answer:
​
[scrollView setContentOffset:CGPointMake(x, y) animated:YES];

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2.How to Scroll UIScrollView scroll to bottom programmatically?
Answer:

CGPoint bottomOffset = CGPointMake(0, self.scrollView.contentSize.height - self.scrollView.bounds.size.height);
[self.scrollView setContentOffset:bottomOffset animated:YES];

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3.How to Scroll a UIScrollView to top programmatically?
Answer:

[self.scrollView setContentOffset:CGPointMake(self.scrollView.contentOffset.x, 0)
    animated:YES];

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4.How to implement page-scroll using UIScrollView programmatically in iOS?
Answer:

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
    CGFloat pageWidth = scrollView.frame.size.width;
    int currentPage = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
    pageControl.currentPage = currentPage;
}
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5.How to detect UIScrollView Scroll direction programmatically in iOS?
Answer:

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    self.lastPage = self.currentPage;
    CGFloat pageWidth = _mainScrollView.frame.size.width;
    self.currentPage = floor((_mainScrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
    if (self.lastPage < self.currentPage) {
        NSLog(@"Right Direction");
    }else if(self.lastPage > self.currentPage){
        NSLog(@"Left Direction");
    }else if (self.lastPage == self.currentPage){
        //same page
        NSLog(@"Same Page");
    }
}

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