import UIKit
class DummyVC: UIViewController, UIScrollViewDelegate { let scrollView = UIScrollView(frame: CGRect(x:0, y:0, width:320,height: 300)) var colors:[UIColor] = [UIColor.red, UIColor.blue, UIColor.green, UIColor.yellow] var frame: CGRect = CGRect(x:0, y:0, width:0, height:0) var pageControl : UIPageControl = UIPageControl(frame: CGRect(x:50,y: 300, width:200, height:50)) override func viewDidLoad() { super.viewDidLoad() configurePageControl() scrollView.delegate = self scrollView.isPagingEnabled = true self.view.addSubview(scrollView) for index in 0..<4 { frame.origin.x = self.scrollView.frame.size.width * CGFloat(index) frame.size = self.scrollView.frame.size let subView = UIView(frame: frame) subView.backgroundColor = colors[index] self.scrollView .addSubview(subView) } self.scrollView.contentSize = CGSize(width:self.scrollView.frame.size.width * 4,height: self.scrollView.frame.size.height) pageControl.addTarget(self, action: #selector(self.changePage(sender:)), for: UIControlEvents.valueChanged) } func configurePageControl() { // The total number of pages that are available is based on how many available colors we have. self.pageControl.numberOfPages = colors.count self.pageControl.currentPage = 0 self.pageControl.tintColor = UIColor.red self.pageControl.pageIndicatorTintColor = UIColor.black self.pageControl.currentPageIndicatorTintColor = UIColor.green self.view.addSubview(pageControl) } // MARK : TO CHANGE WHILE CLICKING ON PAGE ConTROL func changePage(sender: AnyObject) -> () { let x = CGFloat(pageControl.currentPage) * scrollView.frame.size.width scrollView.setContentOffset(CGPoint(x:x, y:0), animated: true) } func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) { let pageNumber = round(scrollView.contentOffset.x / scrollView.frame.size.width) pageControl.currentPage = Int(pageNumber) }}
