Changing page control dots with images swift - ios

Question

I'm trying to change the dots in page control with some images..
Here the code i have tried:
import UIKit
class PageViewController: UIPageViewController, UIPageViewControllerDelegate, UIPageViewControllerDataSource {
// MARK: Data source functions.
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
guard let viewControllerIndex = orderedViewControllers.index(of: viewController) else {
return nil
}
let previousIndex = viewControllerIndex - 1
guard previousIndex >= 0 else {
return orderedViewControllers.last
// Uncommment the line below, remove the line above if you don't want the page control to loop.
// return nil
}
guard orderedViewControllers.count > previousIndex else {
return nil
}
return orderedViewControllers[previousIndex]
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
guard let viewControllerIndex = orderedViewControllers.index(of: viewController) else {
return nil
}
let nextIndex = viewControllerIndex + 1
let orderedViewControllersCount = orderedViewControllers.count
// the first view controller.
guard orderedViewControllersCount != nextIndex else {
return orderedViewControllers.first
// Uncommment the line below, remove the line above if you don't want the page control to loop.
// return nil
}
guard orderedViewControllersCount > nextIndex else {
return nil
}
return orderedViewControllers[nextIndex]
}
lazy var orderedViewControllers: [UIViewController] = {
return [self.newVc(viewController: "sbYellow"),
self.newVc(viewController: "sbRed"),
self.newVc(viewController: "sbBlue")]
}()
var pageControl = UIPageControl()
override func viewDidLoad() {
super.viewDidLoad()
self.dataSource = self
// This sets up the first view that will show up on our page control
if let firstViewController = orderedViewControllers.first {
setViewControllers([firstViewController],
direction: .forward,
animated: true,
completion: nil)
}
let pageControl = CustomPageControl(frame: CGRect(x: 100, y: 100, width: 104, height: 40))
pageControl.numberOfPages = 3
pageControl.currentPage = 0
self.view.addSubview(pageControl)
/*self.delegate = self
configurePageControl()*/
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func configurePageControl() {
// The total number of pages that are available is based on how many available colors we have.
pageControl = UIPageControl(frame: CGRect(x: 0,y: UIScreen.main.bounds.maxY - 50,width: UIScreen.main.bounds.width,height: 50))
self.pageControl.numberOfPages = orderedViewControllers.count
self.pageControl.currentPage = 0
self.pageControl.tintColor = UIColor.black
self.pageControl.pageIndicatorTintColor = UIColor.white
self.pageControl.currentPageIndicatorTintColor = UIColor.black
self.view.addSubview(pageControl)
}
func newVc(viewController: String) -> UIViewController {
return UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: viewController)
}
func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
let pageContentViewController = pageViewController.viewControllers![0]
self.pageControl.currentPage = orderedViewControllers.index(of: pageContentViewController)!
}
}
class CustomPageControl: UIPageControl {
var imageToBeReplacedByDot: UIImage {
return imageLiteral(resourceName: "av_timer - material")// Image you want to
replace with dots
}
var circleImage: UIImage {
return imageLiteral(resourceName: "cancel - material")//Default Image
}
override var numberOfPages: Int {
didSet {
updateDots()
}}
override var currentPage: Int {
didSet {
updateDots()
}}
override func awakeFromNib() {
super.awakeFromNib()
self.pageIndicatorTintColor = UIColor.clear
self.currentPageIndicatorTintColor = UIColor.clear
self.clipsToBounds = false
}
func updateDots() {
var i = 0
for view in self.subviews {
var imageView = self.imageView(forSubview: view)
if imageView == nil {
if i == 0 {
imageView = UIImageView(image: imageToBeReplacedByDot)
} else {
imageView = UIImageView(image: circleImage)
}
imageView!.center = view.center
view.addSubview(imageView!)
view.clipsToBounds = false
}
if i == self.currentPage {
imageView!.alpha = 1.0
} else {
imageView!.alpha = 0.5
}
i += 1
}
}
fileprivate func imageView(forSubview view: UIView) -> UIImageView? {
var dot: UIImageView?
if let dotImageView = view as? UIImageView {
dot = dotImageView
} else {
for foundView in view.subviews {
if let imageView = foundView as? UIImageView {
dot = imageView
break
}
}
}
return dot
}
}
Which is working fine and changing the dots with images... the issue is that the image will not change if i scrolled!.. also i want to position the page control on center top of the screen..
How to achieve that?
Screenshot:

Answer 1

You can use this code for Reference:
import UIKit
class LocationPageControl: UIPageControl {
let locationArrow: UIImage = UIImage(named: "locationArrow")!
let pageCircle: UIImage = UIImage(named: "pageCircle")!
override var numberOfPages: Int {
didSet {
updateDots()
}
}
override var currentPage: Int {
didSet {
updateDots()
}
}
override func awakeFromNib() {
super.awakeFromNib()
self.pageIndicatorTintColor = UIColor.clear
self.currentPageIndicatorTintColor = UIColor.clear
self.clipsToBounds = false
}
func updateDots() {
var i = 0
for view in self.subviews {
var imageView = self.imageView(forSubview: view)
if imageView == nil {
if i == 0 {
imageView = UIImageView(image: locationArrow)
} else {
imageView = UIImageView(image: pageCircle)
}
imageView!.center = view.center
view.addSubview(imageView!)
view.clipsToBounds = false
}
if i == self.currentPage {
imageView!.alpha = 1.0
} else {
imageView!.alpha = 0.5
}
i += 1
}
}
fileprivate func imageView(forSubview view: UIView) -> UIImageView? {
var dot: UIImageView?
if let dotImageView = view as? UIImageView {
dot = dotImageView
} else {
for foundView in view.subviews {
if let imageView = foundView as? UIImageView {
dot = imageView
break
}
}
}
return dot
}
}
Note:- Set your image according as per your need