I have created a User Onboarding as a Collection View with 2 items.
The Collection View has a UIPageControl which shows an active page user currently on.
The problem is I can change the state of active UIPageControl dot only when the transition is ended, after user swiped to the next\previous screen.
This is how it looks now: GIF
I want the behaviour so when you start to swipe UIPageControl should already change its active dot onto the next\previous one without me necessarily ending the swipe (lift the finger).
You can check what I want on the gif: GIF
Here is how I change the UIPageControl dot now:
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
let width = scrollView.frame.width
currentPage = Int(scrollView.contentOffset.x / width)
pageControl.currentPage = currentPage
}
How my code should be modified, which method to use to achieve the behaviour? I couldn't find any similar questions on StackOverflow.
Based on your question...
you have only TWO cells (pages)
you want the page control to reflect which page is most visible
Instead of scrollViewDidEndDecelerating, implement:
func scrollViewDidScroll(_ scrollView: UIScrollView) {
let fw = scrollView.frame.width
// get the percentage scrolled
let pct = scrollView.contentOffset.x / fw
// if it's less-than 50%, we're at page 0
// else, we're at page 1
pageControl.currentPage = pct < 0.5 ? 0 : 1
}
I need to do this app that has a weird configuration.
As shown in the next image, the main view is a UIScrollView. Then inside it should have a UIPageView, and each page of the PageView should have a UITableView.
I've done all this so far. But my problem is that I want the scrolling to behave naturally.
The next is what I mean naturally. Currently when I scroll on one of the UITableViews, it scrolls the tableview (not the scrollview). But I want it to scroll the ScrollView unless the scrollview cannot scroll cause it got to its top or bottom (In that case I'd like it to scroll the tableview).
For example, let's say my scrollview is currently scrolled to the top. Then I put my finger over the tableview (of the current page being shown) and start scrolling down. I this case, I want the scrollview to scroll (no the tableview). If I keep scrolling down my scrollview and it reaches the bottom, if I remove my finger from the display and put it back over the tebleview and scroll down again, I want my tableview to scroll down now because the scrollview reached its bottom and it's not able to keep scrolling.
Do you guys have any idea about how to implement this scrolling?
I'm REALLY lost with this. Any help will be greatly appreciate it :(
Thanks!
The solution to simultaneously handling the scroll view and the table view revolves around the UIScrollViewDelegate. Therefore, have your view controller conform to that protocol:
class ViewController: UIViewController, UIScrollViewDelegate {
I’ll represent the scroll view and table view as outlets:
#IBOutlet weak var scrollView: UIScrollView!
#IBOutlet weak var tableView: UITableView!
We’ll also need to track the height of the scroll view content as well as the screen height. You’ll see why later.
let screenHeight = UIScreen.mainScreen().bounds.height
let scrollViewContentHeight = 1200 as CGFloat
A little configuration is needed in viewDidLoad::
override func viewDidLoad() {
super.viewDidLoad()
scrollView.contentSize = CGSizeMake(scrollViewContentWidth, scrollViewContentHeight)
scrollView.delegate = self
tableView.delegate = self
scrollView.bounces = false
tableView.bounces = false
tableView.scrollEnabled = false
}
where I’ve turned off bouncing to keep things simple. The key settings are the delegates for the scroll view and the table view and having the table view scrolling being turned off at first.
These are necessary so that the scrollViewDidScroll: delegate method can handle reaching the bottom of the scroll view and reaching the top of the table view. Here is that method:
func scrollViewDidScroll(scrollView: UIScrollView) {
let yOffset = scrollView.contentOffset.y
if scrollView == self.scrollView {
if yOffset >= scrollViewContentHeight - screenHeight {
scrollView.scrollEnabled = false
tableView.scrollEnabled = true
}
}
if scrollView == self.tableView {
if yOffset <= 0 {
self.scrollView.scrollEnabled = true
self.tableView.scrollEnabled = false
}
}
}
What the delegate method is doing is detecting when the scroll view has reached its bottom. When that has happened the table view can be scrolled. It is also detecting when the table view reaches the top where the scroll view is re-enabled.
I created a GIF to demonstrate the results:
Modified Daniel's answer to make it more efficient and bug free.
#IBOutlet weak var scrollView: UIScrollView!
#IBOutlet weak var tableView: UITableView!
#IBOutlet weak var tableHeight: NSLayoutConstraint!
override func viewDidLoad() {
super.viewDidLoad()
//Set table height to cover entire view
//if navigation bar is not translucent, reduce navigation bar height from view height
tableHeight.constant = self.view.frame.height-64
self.tableView.isScrollEnabled = false
//no need to write following if checked in storyboard
self.scrollView.bounces = false
self.tableView.bounces = true
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 20
}
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let label = UILabel(frame: CGRect(x: 0, y: 0, width: tableView.frame.width, height: 30))
label.text = "Section 1"
label.textAlignment = .center
label.backgroundColor = .yellow
return label
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = "Row: \(indexPath.row+1)"
return cell
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
if scrollView == self.scrollView {
tableView.isScrollEnabled = (self.scrollView.contentOffset.y >= 200)
}
if scrollView == self.tableView {
self.tableView.isScrollEnabled = (tableView.contentOffset.y > 0)
}
}
Complete project can be seen here:
https://gitlab.com/vineetks/TableScroll.git
After many trials and errors, this is what worked best for me. The solution has to solve two needs 1) determine who's scrolling property should be used; tableView or scrollView? 2) make sure that the tableView doesn't give authority to the scrollView until it has reached the top of it's table/content.
In order to see if the scrollview should be used for scrolling vs the tableview, i checked to see if the UIView right above my tableview was within frame. If the UIView is within frame, it's safe to say the scrollView should have authority to scroll. If the UIView is not within frame, that means that the tableView is taking up the entire window, and therefor should have authority to scroll.
func scrollViewDidScroll(_ scrollView: UIScrollView) {
if scrollView.bounds.intersects(UIView.frame) == true {
//the UIView is within frame, use the UIScrollView's scrolling.
if tableView.contentOffset.y == 0 {
//tableViews content is at the top of the tableView.
tableView.isUserInteractionEnabled = false
tableView.resignFirstResponder()
print("using scrollView scroll")
} else {
//UIView is in frame, but the tableView still has more content to scroll before resigning its scrolling over to ScrollView.
tableView.isUserInteractionEnabled = true
scrollView.resignFirstResponder()
print("using tableView scroll")
}
} else {
//UIView is not in frame. Use tableViews scroll.
tableView.isUserInteractionEnabled = true
scrollView.resignFirstResponder()
print("using tableView scroll")
}
}
hope this helps someone!
None of the answers here worked perfectly for me. Each one had it's owned nuanced problem (needing to do a repeated swipe when one scrollview hit it's bottom, or the scroll indicator not looking correct, etc), so figured I'd throw in another answer.
Ole Begemann has a great write up on doing this exactly https://oleb.net/blog/2014/05/scrollviews-inside-scrollviews/
Despite being an old post, the concepts still apply to the current APIs. Additionally, there is a maintained (Xcode 9 compatible) Objective-C implementation of his approach https://github.com/eyeem/OLEContainerScrollView
If you are facing problem with the nested scrolling issue , here tis the simplest solution for it .
go to your design screen
select your scroll view and then disable bounce on scroll
if your view uses table view inside scroll view then disable bounce on scroll of the table view as well
run and check it is solved
check how to disable bounce on scroll of a scroll view
check how to disable bounce on scroll of a tableview view
I was struggling with this problem, too. There is a very simple solution.
In interface builder:
create simple ViewController
add a simple View, it will be our header, and constrain it to superview
it's the red view on the example below
I have added 12px from top, left and right, and set fixed height to 128px
embed a PageViewController, making sure it is constrained to the superview, and not the header
Now, here comes the fun part: for each page you add, make sure its tableView has an offset from top. Thats it. You can do if with this code, for example (assuming you use UITableViewController as a page):
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
let tables = viewControllers.compactMap { $0 as? UITableViewController }
tables.forEach {
$0.tableView.contentInset = UIEdgeInsets(top: headerView.bounds.height, left: 0, bottom: 0, right: 0)
$0.tableView.contentOffset = CGPoint(x: 0, y: -headerView.bounds.height)
}
}
No messy scroll inside scroll inside table view, no mangling with delegates, no duplicated scrolls, perfectly natural behavior. If you can't see the header, it is probably because of the tableView background color. You have to set it to clear, for the header to be visible from under the tableView.
I think there are two options.
Since you know the size of the scroll view and the main view, you are unable to tell whether the scroll view hit the bottom or not.
if (scrollView.contentOffset.y >= (scrollView.contentSize.height - scrollView.frame.size.height)) {
// reach bottom
}
So when it hit; you basically set
[contentScrollView setScrollEnabled:NO];
and other way around for your tableView.
The other thing, which is more precise I think, is to add Gesture to your views.
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc]
initWithTarget:self action:#selector(respondToTapGesture:)];
// Specify that the gesture must be a single tap
tapRecognizer.numberOfTapsRequired = 1;
// Add the tap gesture recognizer to the view
[self.view addGestureRecognizer:tapRecognizer];
// Do any additional setup after loading the view, typically from a nib
So when you add Gesture, you can simply control the active view by changing setScrollEnabled in the respondToTapGesture.
I found an awesome library
MXParallaxHeader
In Storyboard just set UIScrollView class to MXScrollView then magic happens.
I used this class to handle my UIScrollView when I embed a UIPageViewController container view. even you can insert a parallax header view for more detail.
Also, this library provides Cocoapods and Carthage
I attached an image below which represent UIViewHierarchy.
MXScrollView Hierarchy
SWIFT 5
I had some trouble using Vineet's answer for when I could not guarantee the scrollView content offset (Y) due to various different screen sizes. To resolve this, I changed the first trigger event of when the tableView's scroll gets enabled.
func scrollViewDidScroll(_ scrollView: UIScrollView) {
if scrollView.bounds.contains(button.frame) {
tableView.isScrollEnabled = true
}
if scrollView == tableView {
self.tableView.isScrollEnabled = (tableView.contentOffset.y > 0)
}
}
The scrollView.bounds.contains will check if a given element's frame is FULLY within the scrollView's visible content. I set this to a button that I have below the tableView. You could set this to your tableVIew's frame instead if your only condition is that your tableView is fully visible.
I left the original implementation of when to disable the tableView's scroll and it works very well.
I tried the solution marked as the correct answer, but it was not working properly. The user need to click two times on the table view for scroll and after that I was not able to scroll the entire screen again. So I just applied the following code in viewDidLoad():
tableView.addGestureRecognizer(UISwipeGestureRecognizer(target: self, action: #selector(tableViewSwiped)))
scrollView.addGestureRecognizer(UISwipeGestureRecognizer(target: self, action: #selector(scrollViewSwiped)))
And the code below is the implementation of the actions:
func tableViewSwiped(){
scrollView.isScrollEnabled = false
tableView.isScrollEnabled = true
}
func scrollViewSwiped(){
scrollView.isScrollEnabled = true
tableView.isScrollEnabled = false
}
One easy trick, if you want to achieve it is replacing parent scrollview with normal container view.
Adding a pan gesture on container view, you can play with top constraint of first view to assign negative values. You can keep a check of page View's origin if it achieves to top you can start assigning that value on content offset of the pageView's child view. Until user achieves the table view in a state of top most view in container view, you can keep page tableView's scrolling disabled and allow scrolling manually by setting content offset.
So initially the page view height will be collapsed (or say out of screen) or less at bottom. Later on scrolling down it will expand to take more space.
Gesture will automatically stop responding if out of frames say on nav bar or other view outside container view.
Gestures are a key to user interactive transitions used in many apps. You can mimic scroll for a certain time with it.
In my case I'm using constraint for height like that:
self.heightTableViewConstraint.constant = self.tableView.contentSize.height
self.scrollView.contentInset.bottom = self.tableView.contentSize.height
Below code works great for me
As I wanted to show some header after some scroll and table view supposed to scroll
And in ViewDidLoad add
override func viewDidLoad() {
super.viewDidLoad()
mainScrollView.delegate = self
}
Change 265 to whatever number you want to stop upper scroll
extension AccountViewController: UIScrollViewDelegate {
func scrollViewDidScroll(_ scrollView: UIScrollView) {
print(notebookTableView.contentOffset.y)
if notebookTableView.contentOffset.y < 265 {
if notebookTableView.contentOffset.y > 0 {
mainScrollView.setContentOffset(notebookTableView.contentOffset, animated: false)
} else {
mainScrollView.setContentOffset(CGPoint(x: 0.0, y: 0.0), animated: false)
}
} else {
mainScrollView.setContentOffset(CGPoint(x: 0.0, y: 265), animated: false)
}
}
}
CGFloat tableHeight = 0.0f;
YourArray =[response valueForKey:#"result"];
tableHeight = 0.0f;
for (int i = 0; i < [YourArray count]; i ++) {
tableHeight += [self tableView:self.aTableviewDoc heightForRowAtIndexPath:[NSIndexPath indexPathForRow:i inSection:0]];
}
self.aTableviewDoc.frame = CGRectMake(self.aTableviewDoc.frame.origin.x, self.aTableviewDoc.frame.origin.y, self.aTableviewDoc.frame.size.width, tableHeight);
Maybe brute-force, but working perfectly if cell heights are the same: by the way, I use auto layout.
for the tableView (or collectionView or whatever), set an arbitrary height in storyboard, and make an outlet to class. Wherever appropriate, (viewDidLoad() or...) set the tableView's height big enough so that tableView doesn't need to scroll. (need to know the number of rows in advance) Then only the outer scrollView will scroll nicely.
I have created custom header but I don't know how to animate while scrolling.
Please check below image and let me know how to animate while scrolling.
This animated header in Fotmob app.
First of all add header view as UIvVew and add UIScrollView or UITableView below headerView same as screenshot and follow below step.
set a fixed height constraint to the header view (125 for example) and attach it to top, left and right.
make the UIScrollView below to use all the available space so set to zero top, bottom, left and right constraints.
connect the header view height constraint to the ViewController in order to have something like:
#IBOutlet var headerViewHeightConstraint: NSLayoutConstraint!
set the UIScrollView delegate to the ViewController
declare two properties to limit the maximum and the minimum height of the header view, fox example:
let headerViewMaxHeight: CGFloat = 125
let headerViewMinHeight: CGFloat = 44 + UIApplication.shared.statusBarFrame.height
The entire workaround is based on update the header view height constraint while the UIScrollView is scrolling, so let’s implement the UIScrollViewDelegate and the most important delegate for our case, the scrollViewDidScroll:
func scrollViewDidScroll(_ scrollView: UIScrollView) {
let headerViewMinHeight: CGFloat = 44 + UIApplication.shared.statusBarFrame.height
let yPos = mainScrollView.contentOffset.y
let newHeaderViewHeight: CGFloat = headerViewHeightConstraint.constant - yPos
if newHeaderViewHeight > headerViewMaxHeight {
// Here, Manage Your Score Format View
headerViewHeightConstraint.constant = max(headerViewMaxHeight, newHeaderViewHeight)
} else if newHeaderViewHeight < headerViewMinHeight {
headerViewHeightConstraint.constant = headerViewMinHeight
} else {
headerViewHeightConstraint.constant = newHeaderViewHeight
scrollView.contentOffset.y = 0 // block scroll view
}
}
I have created the same, Check the below image
Overview
TableView
Sample MVVM pattern
Swift 5.0 above
Xcode 11 above
Find the GIT URL for code
HeaderAnimation
In my application I have to implement ScrollView and page control, I used ScrollView for both vertical scrolling and horizontal scrolling. when I drag the screen with scroll horizontal means it works fine but when I drag the screen with scroll Vertical means it has some glitches like(scrolling both vertically and horizontally) unable to stop that or unable to find the issue.
So I decided to place two buttons named next and previous for horizontal scrolling for next page and previous page in page control so I want to stop horizontal scroll when dragging the screen, but I don't know how to stop horizontal scrolling(not vertical scrolling).
Here I have posted the code for Scrolling in page control and Next and previous button actions.
I have declared and called the ScrollView Delegate.
UIScrollViewDelegate
override func viewDidLoad() {
super.viewDidLoad()
configurePageControl()
scrollMainHolderView.delegate = self
scrollMainHolderView.isPagingEnabled = true
}
ScrollView Method is:
//MARK:- Scrollview delegate -
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
let pageNumber = round(scrollView.contentOffset.x / scrollView.frame.size.width)
pageControlNew.currentPage = Int(pageNumber)
self.scrollMainHolderView.contentSize=CGSize(width: self.view.frame.size.width * CGFloat(templateMutArray.count), height: CGFloat((globalYarr[Int(pageNumber)] as? CGFloat)!))
}
Set up code for Page control,
func configurePageControl() {
self.pageControlNew.numberOfPages = templateMutArray.count
self.pageControlNew.currentPage = 0
self.pageControlNew.tintColor = UIColor.red
self.pageControlNew.pageIndicatorTintColor = UIColor.black
self.pageControlNew.currentPageIndicatorTintColor = UIColor.green
}
Code for next and previous button action is,
#IBAction func pagePreviousBtnTapped(_ sender: Any) {
isHorizontalSCrolling = true
scrollMainHolderView.delegate = self
let scrollBounds = self.scrollMainHolderView.bounds
let contentOffset = CGFloat(floor(self.scrollMainHolderView.contentOffset.x - scrollBounds.size.width))
self.movScrollToFrame(contentOffset: contentOffset)
}
#IBAction func pageNextBtnTapped(_ sender: Any) {
isHorizontalSCrolling = true
scrollMainHolderView.delegate = self
let scrollBounds = self.scrollMainHolderView.bounds
let contentOffset = CGFloat(floor(self.scrollMainHolderView.contentOffset.x + scrollBounds.size.width))
self.movScrollToFrame(contentOffset: contentOffset)
}
From what i understand from the comments is that you want to stop horizontal scrolling. That is actually pretty straight forward.
You can stop horizontal scrolling or vertical scrolling in the ScrollViewDelegate Method. Here it is how,
Setting the contentOffset.x value to zero will prevent the scrollview scroll in horizontal direction.
func scrollViewDidScroll(_ scrollView: UIScrollView) {
sender.contentOffset.x = 0.0
}
I need to show UIRefreshControl at the bottom of the UITableView like in the following Objective-C libraries:
https://github.com/emenegro/bottom-pull-to-refresh
https://github.com/vlasov/CCBottomRefreshControl
but I'm using Swift and noticed some problems when using "Bridging-Header.h" file with these libraries.
What is the alternative and the easiest way to achieve such behavior?
Thanks in advance.
I got into the same problem in my project, and found this answer. You can add a UIActivityIndicatorView instance on the bottom of the table, initially hidden, and when it enters the if condition above, unhide it and start its animation.
You may need to change the table's bottom offset, add "1 cell" height to it while it's loading and place it back when it finishes inside the if condition as well.
In Swift 3:
func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
// Use this 'canLoadFromBottom' variable only if you want to load from bottom iff content > table size
let contentSize = scrollView.contentSize.height
let tableSize = scrollView.frame.size.height - scrollView.contentInset.top - scrollView.contentInset.bottom
let canLoadFromBottom = contentSize > tableSize
// Offset
let currentOffset = scrollView.contentOffset.y
let maximumOffset = scrollView.contentSize.height - scrollView.frame.size.height
let difference = maximumOffset - currentOffset
// Difference threshold as you like. -120.0 means pulling the cell up 120 points
if canLoadFromBottom, difference <= -120.0 {
// Save the current bottom inset
let previousScrollViewBottomInset = scrollView.contentInset.bottom
// Add 50 points to bottom inset, avoiding it from laying over the refresh control.
scrollView.contentInset.bottom = previousScrollViewBottomInset + 50
// loadMoreData function call
loadMoreDataFunction(){ result in
// Reset the bottom inset to its original value
scrollView.contentInset.bottom = previousScrollViewBottomInset
}
}
}
var refreshControl: UIRefreshControl!
//Pull to refresh
self.refreshControl = UIRefreshControl()
self.refreshControl.attributedTitle = NSAttributedString(string: "Pull to refresh")
self.refreshControl.addTarget(self, action: "pullToRefresh:", forControlEvents: UIControlEvents.ValueChanged)
self.messageTableView.addSubview(refreshControl)
//Refresh the table view (pull to refresh)
func pullToRefresh(sender:AnyObject)
{
print("pull to refresh...")
}