Change page on UIScrollView

Question

I have a UIScrollView with 10 pages. I am able to flick between them. I also want to have 2 buttons (a back button and a next button) which when touched will go to the previ

Answer 1

Here is an implementation for Swift 4:

func scrollToPage(page: Int, animated: Bool) {
    var frame: CGRect = self.scrollView.frame
    frame.origin.x = frame.size.width * CGFloat(page)
    frame.origin.y = 0
    self.scrollView.scrollRectToVisible(frame, animated: animated)
}

and is easily invoked by calling:

self.scrollToPage(1, animated: true)

Edit:

A nicer way of doing this is to support both horizontal and vertical pagination. Here is a convenient extension for that:

extension UIScrollView {

    func scrollTo(horizontalPage: Int? = 0, verticalPage: Int? = 0, animated: Bool? = true) {
        var frame: CGRect = self.frame
        frame.origin.x = frame.size.width * CGFloat(horizontalPage ?? 0)
        frame.origin.y = frame.size.width * CGFloat(verticalPage ?? 0)
        self.scrollRectToVisible(frame, animated: animated ?? true)
    }

}

This creates an extension on UIScrollView where you can scroll to any page, vertical or horisontal.

self.scrollView.scrollTo(horizontalPage: 0)
self.scrollView.scrollTo(verticalPage: 2, animated: true)
self.scrollView.scrollTo(horizontalPage: 1, verticalPage: 2, animated: true)