how to block vertical swipe movement in UIScrollView in Swift? - swift

Question

i have an Image carousel in my app
i use a UIScrollView to show the images inside.
everything works fine, it's just that i want to know how do i block up movements in the UIScrollView
for now the user can just swipe the picture up.. and i want to block it
i tried doing some fixed but none seems to work now maybe it's something in my code ?
here is my complete view controller for the UIScrollView:
class CaruselleScreenViewController: UIViewController, CaruselleScreenViewProtocol, UIScrollViewDelegate {
#IBOutlet weak var pageControl: UIPageControl!
#IBOutlet weak var scrollView: UIScrollView!
var slides:[CaruselleTipsCard] = [];
override func viewDidLoad() {
super.viewDidLoad()
slides = createSlides()
setupSlideScrollView(slides: slides)
pageControl.numberOfPages = slides.count
pageControl.currentPage = 0
view.bringSubview(toFront: pageControl)
//adds dots
scrollView.delegate = self
// Do any additional setup after loading the view.
}
func createSlides() -> [CaruselleTipsCard] {
let slide1:CaruselleTipsCard = Bundle.main.loadNibNamed("CaruselleTipsCard", owner: self, options: nil)?.first as! CaruselleTipsCard
slide1.mainPic.image = UIImage(named: "backlightingIllo")
//
let slide2:CaruselleTipsCard = Bundle.main.loadNibNamed("CaruselleTipsCard", owner: self, options: nil)?.first as! CaruselleTipsCard
slide2.mainPic.image = UIImage(named: "comfortableIllo")
//
let slide3:CaruselleTipsCard = Bundle.main.loadNibNamed("CaruselleTipsCard", owner: self, options: nil)?.first as! CaruselleTipsCard
slide3.mainPic.image = UIImage(named: "pharmacyIllo")
//
let slide4:CaruselleTipsCard = Bundle.main.loadNibNamed("CaruselleTipsCard", owner: self, options: nil)?.first as! CaruselleTipsCard
slide4.mainPic.image = UIImage(named: "batteryIllo")
//
let slide5:CaruselleTipsCard = Bundle.main.loadNibNamed("CaruselleTipsCard", owner: self, options: nil)?.first as! CaruselleTipsCard
slide5.mainPic.image = UIImage(named: "wiFiIllo")
return [slide1, slide2, slide3, slide4, slide5]
}
func setupSlideScrollView(slides : [CaruselleTipsCard]) {
scrollView.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height)
scrollView.contentSize = CGSize(width: view.frame.width * CGFloat(slides.count), height: view.frame.height)
scrollView.isPagingEnabled = true
for i in 0 ..< slides.count {
slides[i].frame = CGRect(x: view.frame.width * CGFloat(i), y: 0, width: view.frame.width, height: view.frame.height)
scrollView.addSubview(slides[i])
}
}
//////
/*
* default function called when view is scolled. In order to enable callback
* when scrollview is scrolled, the below code needs to be called:
* slideScrollView.delegate = self or
*/
func scrollViewDidScroll(_ scrollView: UIScrollView) {
let pageIndex = round(scrollView.contentOffset.x/view.frame.width)
pageControl.currentPage = Int(pageIndex)
let maximumHorizontalOffset: CGFloat = scrollView.contentSize.width - scrollView.frame.width
let currentHorizontalOffset: CGFloat = scrollView.contentOffset.x
// vertical
let maximumVerticalOffset: CGFloat = scrollView.contentSize.height - scrollView.frame.height
let currentVerticalOffset: CGFloat = scrollView.contentOffset.y
let percentageHorizontalOffset: CGFloat = currentHorizontalOffset / maximumHorizontalOffset
let percentageVerticalOffset: CGFloat = currentVerticalOffset / maximumVerticalOffset
/*
* below code changes the background color of view on paging the scrollview
*/
// self.scrollView(scrollView, didScrollToPercentageOffset: percentageHorizontalOffset)
/*
* below code scales the imageview on paging the scrollview
*/
let percentOffset: CGPoint = CGPoint(x: percentageHorizontalOffset, y: percentageVerticalOffset)
if(percentOffset.x > 0 && percentOffset.x <= 0.25) {
slides[0].mainPic.transform = CGAffineTransform(scaleX: (0.25-percentOffset.x)/0.25, y: (0.25-percentOffset.x)/0.25)
slides[1].mainPic.transform = CGAffineTransform(scaleX: percentOffset.x/0.25, y: percentOffset.x/0.25)
} else if(percentOffset.x > 0.25 && percentOffset.x <= 0.50) {
slides[1].mainPic.transform = CGAffineTransform(scaleX: (0.50-percentOffset.x)/0.25, y: (0.50-percentOffset.x)/0.25)
slides[2].mainPic.transform = CGAffineTransform(scaleX: percentOffset.x/0.50, y: percentOffset.x/0.50)
} else if(percentOffset.x > 0.50 && percentOffset.x <= 0.75) {
slides[2].mainPic.transform = CGAffineTransform(scaleX: (0.75-percentOffset.x)/0.25, y: (0.75-percentOffset.x)/0.25)
slides[3].mainPic.transform = CGAffineTransform(scaleX: percentOffset.x/0.75, y: percentOffset.x/0.75)
} else if(percentOffset.x > 0.75 && percentOffset.x <= 1) {
slides[3].mainPic.transform = CGAffineTransform(scaleX: (1-percentOffset.x)/0.25, y: (1-percentOffset.x)/0.25)
slides[4].mainPic.transform = CGAffineTransform(scaleX: percentOffset.x, y: percentOffset.x)
}
}
}
can you tell me how to block vertical swipe ?

Answer 1

You can try something like this,
scrollView.showsVerticalScrollIndicator = false
scrollView.contentSize = CGSize(width: scrollView.contentSize.width, height: 0) //disable vertical