I want to add a UITapGestureRecognizer to my view named SetView. My setviews are created programmatically on another custom view called GridView.
This is what I have tried so far but I am not seeing any action while tapping my subvies.
import UIKit
#IBDesignable
class GridView: UIView {
private(set) lazy var deckOfCards = createDeck()
lazy var grid = Grid(layout: Grid.Layout.fixedCellSize(CGSize(width: 128.0, height: 110.0)), frame: CGRect(origin: CGPoint(x: bounds.minX, y: bounds.minY), size: CGSize(width: bounds.width, height: bounds.height)))
lazy var listOfSetCard = createSetCards()
private func createDeck() -> [SetCard] {
var deck = [SetCard]()
for shape in SetCard.Shape.allShape {
for color in SetCard.Color.allColor {
for content in SetCard.Content.allContent {
for number in SetCard.Number.allNumbers {
deck.append(SetCard(shape: shape, color: color, content: content, rank: number))
}
}
}
}
deck.shuffle()
return deck
}
private func createSetCards() -> [SetView] {
var cards = [SetView]()
for _ in 0..<cardsOnScreen {
let card = SetView()
let contentsToBeDrawn = deckOfCards.removeFirst()
card.combinationOnCard.shape = contentsToBeDrawn.shape
card.combinationOnCard.color = contentsToBeDrawn.color
card.combinationOnCard.content = contentsToBeDrawn.content
card.combinationOnCard.rank = contentsToBeDrawn.rank
/* print(contentsToBeDrawn.color) */
addSubview(card)
cards.append(card)
}
return cards
}
override func layoutSubviews() {
super.layoutSubviews()
for index in listOfSetCard.indices {
let card = listOfSetCard[index]
if let rect = grid[index] {
card.frame = rect.insetBy(dx: 2.5, dy: 2.5)
card.frame.origin = rect.origin
print(card.frame.origin)
}
}
}
Here is the function didTap(sender: UITapGestureRecognizer) that I wrote on SetView:
#objc func didTap(sender: UITapGestureRecognizer) {
switch sender.state {
case .changed,.ended:
let rect = UIBezierPath(rect: bounds)
fillBoundingRect(inRect: rect, color: UIColor.gray)
default:
break
}
And ViewController:
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
for _ in 1...12 {
let card = game.drawModelCard()
game.deck.append(card)
}
}
lazy var game = SetGame()
weak var setView : SetView! {
didSet {
let tapGestureRecognizer = UITapGestureRecognizer(target:
setView, action: #selector(SetView.didTap(sender:)))
setView.isUserInteractionEnabled = true
setView.addGestureRecognizer(tapGestureRecognizer)
}
}
}
My subviews(SetViews) should change the background color once tapped.
My code creates a scrollview and image view that displays a picture array from a previous view controller. However, I am trying to implement code to make it so the user may zoom in on a picture. But what ever I do, it does not work. Any suggestions on what I am doing wrong, or where to implement the zoom in code? Thank you!
import UIKit
class DestinationVC: UIViewController {
#IBOutlet weak var myScrollView: UIScrollView!
var mySelectedProtocol:Protocol?
var pageControl:UIPageControl?
var currentPageIndex:Int=0
fileprivate var count:Int=0
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
if mySelectedProtocol == nil { self.navigationController?.popViewController(animated: true) }
if mySelectedProtocol!.imagesName!.count == 0 { self.navigationController?.popViewController(animated: true) }
/// We have Data
print("Img Array with Name ==> \(mySelectedProtocol?.imagesName ?? [])")
DispatchQueue.main.async {
self.addPageView()
}
}
func viewForZooming(in scrollView: UIScrollView) -> UIView? {
myScrollView.delegate = self
myScrollView.minimumZoomScale = 1.0
myScrollView.maximumZoomScale = 5.0
return myScrollView
}
private func addPageView() {
myScrollView.backgroundColor=UIColor.black
myScrollView.isUserInteractionEnabled=true
myScrollView.showsHorizontalScrollIndicator=true
myScrollView.isPagingEnabled=true
myScrollView.delegate=self
myScrollView.bounces=false
self.count=mySelectedProtocol!.imagesName!.count
for i in 0..<self.count {
///Get Origin
let xOrigin : CGFloat = CGFloat(i) * myScrollView.frame.size.width
///Create a imageView
let imageView = UIImageView()
imageView.frame = CGRect(x: xOrigin, y: 0, width: myScrollView.frame.size.width, height: myScrollView.frame.size.height)
imageView.contentMode = .scaleAspectFit
imageView.image=UIImage(named: mySelectedProtocol!.imagesName![i])
myScrollView.addSubview(imageView)
}
setUpPageControl()
///Set Content Size to Show
myScrollView.contentSize = CGSize(width: myScrollView.frame.size.width * CGFloat(self.count), height: myScrollView.frame.size.height)
}
private func setUpPageControl() {
if pageControl == nil { pageControl=UIPageControl() }
pageControl!.numberOfPages = self.count
pageControl!.currentPageIndicatorTintColor = UIColor.red
pageControl!.pageIndicatorTintColor = UIColor.white
pageControl!.frame = CGRect(x: 0, y: 20, width: self.view.frame.width, height: self.view.frame.height*0.2)
pageControl!.currentPage=currentPageIndex
self.view.addSubview(pageControl!)
self.view.bringSubview(toFront: pageControl!)
}
}
extension DestinationVC: UIScrollViewDelegate {
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
let scrollW : CGFloat = scrollView.frame.size.width
currentPageIndex = Int(scrollView.contentOffset.x / scrollW)
self.pageControl!.currentPage=currentPageIndex
}
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
let scrollW : CGFloat = scrollView.frame.size.width
currentPageIndex = Int(scrollView.contentOffset.x / scrollW)
self.pageControl!.currentPage=currentPageIndex
}
}
You set the minimumScale to 1.0 - that's just 1x the normal scale. If you want it to be zoom down closer, you could try setting the minimum zoom like this:
let scaleWidth = scrollView.frame.size.width / scrollView.contentSize.width
let scaleHeight = scrollView.frame.size.height / scrollView.contentSize.height
let minScale = min(scaleWidth, scaleHeight)
scrollView.minimumZoomScale = minScale
scrollView.maximumZoomScale = 1.0
scrollView.zoomScale = minScale
And set the maximumZoomScale to 1.0 - the size of the content.
I wanted to implement a loading overlay whilst I have content loading in from an API call however when I go to dismiss the view; I have no success.
func viewLoading(show:Bool, boxView: UIView, error: Bool, errorMessage: String){
let myNewView=UIView(frame: CGRect(x: 0, y: 0, width: boxView.frame.width, height: boxView.frame.height))
if show{
// Change UIView background colour
myNewView.backgroundColor = UIColor.black.withAlphaComponent(0.75)
myNewView.isOpaque = false
// Add rounded corners to UIView
myNewView.layer.cornerRadius = boxView.layer.cornerRadius
let activityView = UIActivityIndicatorView(style: .whiteLarge)
activityView.center = myNewView.center
activityView.startAnimating()
boxView.addSubview(myNewView)
myNewView.addSubview(activityView)
}else{
print("Done")
DispatchQueue.main.async(execute: { () -> Void in
myNewView.removeFromSuperview()
self.view.bringSubviewToFront(boxView)
})
myNewView.isHidden = true
}
}
None of the options after else have worked and I am lost at a solution.
Edit: I want the same function(s) to accommodate three different views within the one view controller.
Move myNewView outside of the viewLoading function scope, and it is better to create separate methods with their own responsibilities, like so:
class ViewController: UIViewController {
var loaderView: UIView?
func showLoading(boxView: UIView, error: Bool, errorMessage: String) {
if (self.loaderView != nil) {
self.hideLoading()
}
let newView = UIView(frame: CGRect(x: 0, y: 0, width: boxView.frame.width, height: boxView.frame.height))
newView.backgroundColor = UIColor.black.withAlphaComponent(0.75)
newView.isOpaque = false
// Add rounded corners to UIView
newView.layer.cornerRadius = boxView.layer.cornerRadius
let activityView = UIActivityIndicatorView(style: .whiteLarge)
activityView.center = newView.center
activityView.startAnimating()
boxView.addSubview(newView)
newView.addSubview(activityView)
self.loaderView = newView
}
func hideLoading() {
guard
let loaderView = self.loaderView,
let boxView = loaderView.superview
else { return }
DispatchQueue.main.async {
loaderView.removeFromSuperview()
self.view.bringSubviewToFront(boxView) // need this?
self.loaderView = nil
}
}
}
You are creating a new view every time that method is called and then you are trying to dismish that newly created view. Instead, you should save a reference of the view when you show it and call removeFromSuperview on that instance when you need to hide it.
Check this..
CommonMethods.swift
import UIKit
class CommonMethods: UIViewController {
static let actInd: UIActivityIndicatorView = UIActivityIndicatorView()
static let container: UIView = UIView()
static let loadingView: UIView = UIView()
static func showActivityIndicatory(uiView: UIView) {
container.frame = uiView.frame
container.center = uiView.center
container.backgroundColor = UIColor(red:255/255, green:255/255, blue:255/255, alpha: 0.3)
loadingView.frame = CGRect(origin: CGPoint(x: 0,y :0), size: CGSize(width: 80, height: 80))
loadingView.center = uiView.center
loadingView.backgroundColor = UIColor(red:44/255, green:44/255, blue:44/255, alpha: 0.7)
loadingView.clipsToBounds = true
loadingView.layer.cornerRadius = 10
actInd.frame = CGRect(origin: CGPoint(x: 0,y :0), size: CGSize(width: 40, height: 40))
actInd.style =
UIActivityIndicatorView.Style.whiteLarge
actInd.center = CGPoint(x: loadingView.frame.size.width / 2, y: loadingView.frame.size.height / 2);
loadingView.addSubview(actInd)
container.addSubview(loadingView)
uiView.addSubview(container)
actInd.startAnimating()
}
static func hideActivityIndicatory(uiView: UIView) {
container.removeFromSuperview()
actInd.stopAnimating()
}
}
call it from viewcontroller class like
CommonMethods.showActivityIndicatory(uiView: self.view)
CommonMethods.hideActivityIndicatory(uiView: self.view)
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
I'm trying to block the vertical scroll by doing:
scrollView.showsVerticalScrollIndicator = false
scrollView.contentSize = CGSize(width: scrollView.contentSize.width, height: 0) //disable vertical
everything in that works fine and it really blocks the vertical scroll
The problem is,
that I also have a timer, that moves the UIScrollView programmatically by doing:
var frame: CGRect = scrollView.frame
frame.origin.x = frame.size.width * CGFloat(pageToMove)
frame.origin.y = -35
scrollView.scrollRectToVisible(frame, animated: true)
and once I block the vertical scroll,
this function to scrollReactToVisible doesn't do anything.
and I don't get any error for that.
is there a way currently to also block the scroll vertically (and allow to scroll right and left as usual) and also move the scrollview programmatically?
I'm attaching my full view controller:
class CaruselleScreenViewController: UIViewController, CaruselleScreenViewProtocol, UIScrollViewDelegate {
var myPresenter: CaruselleScreenPresenterProtocol?
#IBOutlet weak var pageControl: UIPageControl!
#IBOutlet weak var scrollView: UIScrollView!
var slides:[CaruselleTipsCard] = [];
var timer:Timer?
var currentPageMultiplayer = 0
override func viewDidLoad() {
super.viewDidLoad()
myPresenter = CaruselleScreenPresenter(controller: self)
//initlizes view
pageControl.numberOfPages = slides.count
pageControl.currentPage = 0
view.bringSubview(toFront: pageControl)
//delegates
scrollView.delegate = self
////blocks vertical movement
scrollView.showsVerticalScrollIndicator = false
//scrollView.contentSize = CGSize(width: scrollView.contentSize.width, height: 0) //disable vertical
}
func scheduleTimer(_ timeInterval: TimeInterval){
timer = Timer.scheduledTimer(timeInterval: timeInterval, target: self, selector: #selector(timerCall), userInfo: nil, repeats: false)
}
#objc func timerCall(){
print("Timer executed")
currentPageMultiplayer = currentPageMultiplayer + 1
if (currentPageMultiplayer == 5) {
currentPageMultiplayer = 0
}
pageControl.currentPage = currentPageMultiplayer
scrollToPage(pageToMove: currentPageMultiplayer)
scheduleTimer(5)
}
func scrollToPage(pageToMove: Int) {
print ("new one")
var frame: CGRect = scrollView.frame
frame.origin.x = frame.size.width * CGFloat(pageToMove)
frame.origin.y = -35
scrollView.scrollRectToVisible(frame, animated: true)
}
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 scrolled. 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)
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "findingClinitionSugue" {
let destination = segue.destination as! FirstAvailableSearchViewController
//destination.consumer = consumer
}
if (timer != nil) {
timer?.invalidate()
}
}
// protocol functions
func initlizeSlides() {
slides = createSlides()
setupSlideScrollView(slides: slides)
}
func initlizeTimer() {
scheduleTimer(5)
}
}
The problem might be about setting the contentSize height value to 0 initally, so even though timer wants scrollView to move, it cannot do that.
Can you try replacing this line:
scrollView.contentSize = CGSize(width: scrollView.contentSize.width, height: 0)
With:
scrollView.contentInsetAdjustmentBehavior = .never
Depending the application and functionality required within the scrollview - could you disable user interaction of the scrollview so it can still be moved programmatically?
That would just be
scrollView.isUserInteractionEnabled = false
This would of course depend on whether you need items in the scrollview to be interactive
Maybe you can subclass your UIScrollView, and override touchesBegan.
class CustomScrollView: UIScrollView {
var touchesDisabled = false
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
if touchesDisabled {
// here parse the touches, if they go in the horizontal direction, allow scrolling
// set tolerance for vertical movement
let tolerance: CGFloat = 5.0
let variance = touches.reduce(0, { Yvariation, touch in
Yvariation + abs(touch.location(in: view).y - touch.previousLocation(in: view).y)
})
if variance <= tolerance * CGFloat(touches.count) {
let Xtravelled = touches.reduce(0, { Xstep, touch in
Xstep + (touch.location(in: view).x - touch.previousLocation(in: view).x)
})
// scroll horizontally by the x component of hand gesture
var newFrame: CGRect = scrollView.frame
newFrame.origin.x += Xtravelled
self.scrollRectToVisible(frame, animated: true)
}
}
else {
super.touchesBegan(touches: touches, withEvent: event)
}
}
}
This way you can manually move the scrollview horizontally while disabling vertical movement when touchesDisabled is set true.
If I've understood you problem well, you can stop scrolling whenever you want with this
scrollView.isScrollEnabled = false
Using UIScrollViewDelegate (or KVO on scrollView's contentOffset), you can just counteract any vertical movement in the carousel. Something like this:
var oldYOffset: CGFloat ....
func scrollViewDidScroll(_ scrollView: UIScrollView) {
let deltaY = oldYOffset - scrollView.contentOffset.y
oldYOffset = scrollView.contentOffset.y
scrollView.contentOffset.y -= deltaY
}
This offset change will not be visible to the user. You could even use this to increase the speed of the scrolling, invert the scrolling (pan left and scrollView scrolls right), or entirely lock the motion of the scrollView without touching isScrollEnabled, contentSize, etc.
This turned out to be quite an interesting problem...
While it is easy to lock UIScrollView scrolling to one axis only using the UIScrollViewDelegate, it is impossible to provide smooth scrolling while changing the scrolling programmatically (as you do with the Timer) at the same time.
Below, you will find a DirectionLockingScrollView class I just wrote that should make things easier for you. It's a UIScrollView that you can initialize either programmatically, or via the Interface Builder.
It features isHorizontalScrollingEnabled and isVerticalScrollingEnabled properties.
HOW IT WORKS INTERNALLY
It adds a second "control" UIScrollView that is identical to the main DirectionLockingScrollView and propagates to it all pan events intended for the main scroll view. Every time the "control" scroll view's bounds change, the change is propagated to the main scroll view BUT x and y are altered (based on isHorizontalScrollingEnabled and isVerticalScrollingEnabled) to disable scrolling on the requested axis.
DirectionLockingScrollView.swift
/// `UIScrollView` subclass that supports disabling scrolling on any direction
/// while allowing the other direction to be changed programmatically (via
/// `setContentOffset(_:animated)` or `scrollRectToVisible(_:animated)` or changing the
/// bounds etc.
///
/// Can be initialized programmatically or via the Interface Builder.
class DirectionLockingScrollView: UIScrollView {
var isHorizontalScrollingEnabled = true
var isVerticalScrollingEnabled = true
/// The control scrollview is added below the `DirectionLockingScrollView`
/// and is used to implement all native scrollview behaviours (such as bouncing)
/// based on user input.
///
/// It is required to be able to change the bounds of the `DirectionLockingScrollView`
/// while maintaining scrolling in only one direction and allowing for setting the contentOffset
/// (changing scrolling for any axis - even the disabled ones) programmatically.
private let _controlScrollView = UIScrollView(frame: .zero)
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
installCustomScrollView()
}
override init(frame: CGRect) {
super.init(frame: frame)
installCustomScrollView()
}
override func layoutSubviews() {
super.layoutSubviews()
updateCustomScrollViewFrame()
}
override func didMoveToSuperview() {
super.didMoveToSuperview()
guard let superview = superview else {
_controlScrollView.removeFromSuperview()
return
}
superview.insertSubview(_controlScrollView, belowSubview: self)
updateCustomScrollViewFrame()
}
// MARK: - UIEvent propagation
func viewIgnoresEvents(_ view: UIView?) -> Bool {
let viewIgnoresEvents =
view == nil ||
view == self ||
!view!.isUserInteractionEnabled ||
!(view is UIControl && (view!.gestureRecognizers ?? []).count == 0)
return viewIgnoresEvents
}
override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
let view = super.hitTest(point, with: event)
if viewIgnoresEvents(view) {
return _controlScrollView
}
return view
}
// MARK: - Main scrollview settings propagation to `controlScrollView`
override var contentInset: UIEdgeInsets {
didSet {
_controlScrollView.contentInset = contentInset
}
}
override var contentScaleFactor: CGFloat {
didSet {
_controlScrollView.contentScaleFactor = contentScaleFactor
}
}
override var contentSize: CGSize {
didSet {
_controlScrollView.contentSize = contentSize
}
}
override var bounces: Bool {
didSet {
_controlScrollView.bounces = bounces
}
}
override var bouncesZoom: Bool {
didSet {
_controlScrollView.bouncesZoom = bouncesZoom
}
}
}
extension DirectionLockingScrollView: UIScrollViewDelegate {
func scrollViewDidScroll(_ scrollView: UIScrollView) {
updateBoundsFromCustomScrollView(scrollView)
}
}
private extension DirectionLockingScrollView {
/// Propagates `controlScrollView` bounds to the actual scrollview.
/// - Parameter scrollView: If the scrollview provided is not the `controlScrollView`
// the main scrollview bounds are not updated.
func updateBoundsFromCustomScrollView(_ scrollView: UIScrollView) {
if scrollView != _controlScrollView {
return
}
var newBounds = scrollView.bounds.origin
if !isHorizontalScrollingEnabled {
newBounds.x = self.contentOffset.x
}
if !isVerticalScrollingEnabled {
newBounds.y = self.contentOffset.y
}
bounds.origin = newBounds
}
func installCustomScrollView() {
_controlScrollView.delegate = self
_controlScrollView.contentSize = contentSize
_controlScrollView.showsVerticalScrollIndicator = false
_controlScrollView.showsHorizontalScrollIndicator = false
// The panGestureRecognizer is removed because pan gestures might be triggered
// on subviews of the scrollview which do not ignore touch events (determined
// by `viewIgnoresEvents(_ view: UIView?)`). This can happen for example
// if you tap and drag on a button inside the scroll view.
removeGestureRecognizer(panGestureRecognizer)
}
func updateCustomScrollViewFrame() {
if _controlScrollView.frame == frame { return }
_controlScrollView.frame = frame
}
}
USAGE
After you've included the above class in your app, don't forget to change your scroll view's class to DirectionLockingScrollView in your .xib or .storyboard.
Then update your code as below (only two lines changed, marked with // *****).
class CaruselleScreenViewController: UIViewController, CaruselleScreenViewProtocol, UIScrollViewDelegate {
var myPresenter: CaruselleScreenPresenterProtocol?
#IBOutlet weak var pageControl: UIPageControl!
#IBOutlet weak var scrollView: DirectionLockingScrollView! // *****
var slides:[CaruselleTipsCard] = [];
var timer:Timer?
var currentPageMultiplayer = 0
override func viewDidLoad() {
super.viewDidLoad()
myPresenter = CaruselleScreenPresenter(controller: self)
//initlizes view
pageControl.numberOfPages = slides.count
pageControl.currentPage = 0
view.bringSubview(toFront: pageControl)
scrollView.isHorizontalScrollingEnabled = false // *****
//delegates
scrollView.delegate = self
////blocks vertical movement
scrollView.showsVerticalScrollIndicator = false
//scrollView.contentSize = CGSize(width: scrollView.contentSize.width, height: 0) //disable vertical
}
func scheduleTimer(_ timeInterval: TimeInterval){
timer = Timer.scheduledTimer(timeInterval: timeInterval, target: self, selector: #selector(timerCall), userInfo: nil, repeats: false)
}
#objc func timerCall(){
print("Timer executed")
currentPageMultiplayer = currentPageMultiplayer + 1
if (currentPageMultiplayer == 5) {
currentPageMultiplayer = 0
}
pageControl.currentPage = currentPageMultiplayer
scrollToPage(pageToMove: currentPageMultiplayer)
scheduleTimer(5)
}
func scrollToPage(pageToMove: Int) {
print ("new one")
var frame: CGRect = scrollView.frame
frame.origin.x = frame.size.width * CGFloat(pageToMove)
frame.origin.y = -35
scrollView.scrollRectToVisible(frame, animated: true)
}
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 scrolled. 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)
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "findingClinitionSugue" {
let destination = segue.destination as! FirstAvailableSearchViewController
//destination.consumer = consumer
}
if (timer != nil) {
timer?.invalidate()
}
}
// protocol functions
func initlizeSlides() {
slides = createSlides()
setupSlideScrollView(slides: slides)
}
func initlizeTimer() {
scheduleTimer(5)
}
}
I found some really annoying problem with UILabel not working with AutoLayout.
I found multiple threads about this, but none of solutions worked for me.
class AudiosHeaderCell: CollectionViewCell<AudiosHeaderItemViewModel> {
var label: UILabelPreferedWidth? {
didSet {
self.label?.textAlignment = .center
self.label?.numberOfLines = 0
self.label?.lineBreakMode = .byWordWrapping
self.label?.font = Font.Standard.size14
self.label?.textColor = UIColor(netHex: 0x185B97)
}
}
let labelLeftRightMargin = CGFloat(16)
override func setupViews() {
self.backgroundColor = UIColor.white
self.label = UILabelPreferedWidth()
self.contentView.addSubview(self.label!)
}
override func setupConstraints() {
self.label?.snp.makeConstraints { (make) in
make.edges.equalToSuperview().inset(UIEdgeInsets(top: 8, left: labelLeftRightMargin, bottom: 8, right: labelLeftRightMargin))
}
}
override func bindViewModel(viewModel: AudiosHeaderItemViewModel) {
self.label?.text = viewModel.text
}
}
class UILabelPreferedWidth : UILabel {
override var bounds: CGRect {
didSet {
print("SET BOUNDS", bounds)
if (bounds.size.width != oldValue.size.width) {
self.setNeedsUpdateConstraints()
}
}
}
override func updateConstraints() {
print("updateConstraints", preferredMaxLayoutWidth, bounds)
if(preferredMaxLayoutWidth != bounds.size.width) {
preferredMaxLayoutWidth = bounds.size.width
}
super.updateConstraints()
}
}
I use a method to calculate the size of the cell like this:
func sizeForCellWithViewModel(_ viewModel: IReusableViewModel, fittingSize: CGSize) -> CGSize {
let cell = self.classRegistry.instances[viewModel.reuseIdentifier]!
(cell as! ICollectionViewCell).setViewModel(viewModel)
cell.translatesAutoresizingMaskIntoConstraints = false
cell.contentView.translatesAutoresizingMaskIntoConstraints = false
cell.frame = CGRect(x: 0, y: 0, width: fittingSize.width, height: fittingSize.height)
cell.setNeedsLayout()
cell.layoutIfNeeded()
print("SIZE FOR ", cell, "FITTING ", fittingSize, "IS", cell.systemLayoutSizeFitting(fittingSize))
return cell.systemLayoutSizeFitting(fittingSize)
}
It works for multiple cells that has some images and other content, but it fails on such a simple problem like scaling to content of UILabel.
Problem I have is that systemLayoutSizeFitting.width returns size that is larger than fittingSize.width parameter I pass.
I've been debugging this long time and I found out that preferredMaxLayoutWidth is not updating properly, as bounds for this UILabel are going beyond cell frame - despite the constraints I use there.
Does anyone have a good solution for that ?
The only one I found is to use this on CollectionViewCell:
override var frame: CGRect {
didSet {
self.label?.preferredMaxLayoutWidth = self.frame.size.width - 32
}
}
But I hate it because it forces me to synchronise that with constraints and it will be required to all other use-cases in my application to remember to copy that.
What I'm looking for is AutoLayout, Constraint only solution.
Ok problem solved by adding width constraint to the Cell's contentView:
func sizeForCellWithViewModel(_ viewModel: IReusableViewModel, fittingSize: CGSize) -> CGSize {
let cell = self.classRegistry.instances[viewModel.reuseIdentifier]!
(cell as! ICollectionViewCell).setViewModel(viewModel)
cell.contentView.frame = CGRect(x: 0, y: 0, width: fittingSize.width, height: fittingSize.height)
cell.contentView.snp.removeConstraints()
if fittingSize.width != 0 {
cell.contentView.snp.makeConstraints { (make) in
make.width.lessThanOrEqualTo(fittingSize.width)
}
}
if fittingSize.height != 0 {
cell.contentView.snp.makeConstraints({ (make) in
make.height.lessThanOrEqualTo(fittingSize.height)
})
}
cell.contentView.setNeedsLayout()
cell.contentView.layoutIfNeeded()
return cell.contentView.systemLayoutSizeFitting(fittingSize)
}
Seems that this somehow makes UILabel works and preferredWidth not going crazy.