Change tab in tab bar controller using finger swipe - swift

Question

I have three tabs in my tabbar controller and I want to switch between these tabs just like tinder switches the tab using finger touch. I have done it using UISwipeGestureRecognizer but its not exactly same as that of Tinder (the dating app ) swiping.
I have added UISwipeGestureRecognizer on one of the Tabbar controller and then added the function to change the tabbar selected index. But the animations is not controlled by finger touch. I want the swiping should be controlled by finger touch.

Answer 1

I think the best way to do it is to put all your tab views in a UIScrollView. You place them next to each other.
Implement the scroll view delegate methods in your tabbarController.
You'll probably need scrollViewDidEndScrollingAnimation and scrollViewDidEndDecelerating to know on which view you are when the user stops scrolling, like this:
let page_width=UIScreen.main.bounds.width
let page=Int(floor((scrollView.contentOffset.x-page_width/2)/page_width)+1)
Here, I assume each of your tab view is the same size as the screen.

Answer 2

I am bit late but I found my ans -
I have created 4 UIviewcontrollers programatically and then
created an array of it.
var views = [CareTeamTableViewController(),VFCChatQViewController(), NewAccountViewController(), ShareViewController()]
Then I added a scrollview in my main UiViewController
private func initMainScroll() {
scrollView = UIScrollView.init()
scrollView?.delegate = self
scrollView?.showsHorizontalScrollIndicator = false
scrollView?.isPagingEnabled = true
self.view.addSubview(scrollView!)
}
and then added the views array like :
func setupScrollView(complete:()->()) {
scrollView?.frame = views.first!.view.frame
scrollView?.contentSize = CGSize(width: CGFloat(views.count) * UIScreen.main.bounds.width, height: 0)
_ = views.map({ addViewToScrollView($0) })
_ = views.map({ $0.view.frame.origin = CGPoint(x: CGFloat(views.index(of: $0)!) * UIScreen.main.bounds.width, y: 0) })
complete()
}
func addViewToScrollView(_ viewController: UIViewController) {
scrollView?.addSubview(viewController.view)
viewController.willMove(toParentViewController: self)
addChildViewController(viewController)
}