Does iOS/UIKit have built in support for scheduling scroll like dinging

Does iOS/UIKit have built in support for scheduling scroll like dinging

By : Hardik
Date : October 19 2020, 08:10 AM
help you fix your problem I think you are on the right way. You can use use timers to repeat some actions, but you should add the created timer into a run loop with a common mode, without this mode, the run loop will not call the timer's action while a user is touching the screen
code :
let timer = Timer(timerInterval: interval, repeats: true, block: block) 
RunLoop.current.add(timer, forMode: . common)
let link = CADisplayLink(target: self, selector: #selector(updateAction(sender:)));
link.add(to: RunLoop.main, forMode: .commonModes);

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Is there a base/utility class in UIKit with event handling built in?

Is there a base/utility class in UIKit with event handling built in?

By : user4858259
Date : March 29 2020, 07:55 AM
it should still fix some issue UIButton is a subclass of UIControl. UIControl manages the target/action list for each control event. It has a predefined set of control events, like UIControlEventTouchUpInside and UIControlEventValueChanged. Each control event is represented by a bit in a mask. The bitmask has four bits reserved for app-defined events (UIControlEventApplicationReserved = 0x0F000000).
If UIControl doesn't do what you want, you'll need to roll your own event management.
How has Facebook built this fixed-on-scroll box with iOS support?

How has Facebook built this fixed-on-scroll box with iOS support?

By : Mark Petrie
Date : March 29 2020, 07:55 AM
wish of those help Apparantly it uses the webkit function position: -webkit-sticky;
Explanation is found here.
Does swift playground support UIKit?

Does swift playground support UIKit?

By : Fossy
Date : March 29 2020, 07:55 AM
it helps some times I tried to create a UILabel in playground but failed. Does playground only support OS X development for now? , YES, it does!
File: New > File... > iOS > Source > Playground
code :
import UIKit
let lbl = UILabel(frame: CGRectMake(0, 0, 300, 100))
lbl.text = "Hello StackOverflow!"
Stacking UIkit.modal built-in dialogs

Stacking UIkit.modal built-in dialogs

By : Peter Kamali
Date : March 29 2020, 07:55 AM
I hope this helps you . Seems to have found a solution: https://codepen.io/zorgoz/pen/pOZRyP
UIkit.modal.confirm('My message!', {stack: true,...}) seem to work.
UIKit - Swift - Allow tableHeaderView to scroll up, but not down

UIKit - Swift - Allow tableHeaderView to scroll up, but not down

By : Stefan
Date : March 29 2020, 07:55 AM
hope this fix your issue You can try creating a view and placing it behind the tableView, as the table view scrolls, the height of the view is updated.
code :
import UIKit

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

    lazy var tableView : UITableView = {
        let tableView = UITableView(frame: .zero, style: .plain)
        tableView.dataSource = self
        tableView.delegate = self
        return tableView

    let backView : UIView = {
        let view = UIView()
        view.backgroundColor = .red
        return view

    var backViewHeight : NSLayoutConstraint?

    override func viewDidLoad() {

        self.title = "ViewController"

        backView.translatesAutoresizingMaskIntoConstraints = false
        backView.topAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.topAnchor).isActive = true
        backView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor).isActive = true
        backView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor).isActive = true
        backViewHeight = backView.heightAnchor.constraint(equalToConstant: 0)
        backViewHeight?.isActive = true

        tableView.translatesAutoresizingMaskIntoConstraints = false
        tableView.topAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.topAnchor).isActive = true
        tableView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor).isActive = true
        tableView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true
        tableView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor).isActive = true
        tableView.register(Cell.self, forCellReuseIdentifier: "cell")
        tableView.register(Header.self, forHeaderFooterViewReuseIdentifier: "header")
        tableView.backgroundColor = .clear

        self.navigationController?.navigationBar.barTintColor = .red
        self.navigationController?.navigationBar.isTranslucent = false
        self.navigationController?.navigationBar.setValue(true, forKey: "hidesShadow")


    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 3

    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        if scrollView.contentOffset.y < 0 {
            backViewHeight?.constant = -scrollView.contentOffset.y

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
        return cell

    func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        let header = tableView.dequeueReusableHeaderFooterView(withIdentifier: "header")
        header?.contentView.backgroundColor = .red
        let headerLabel = UILabel(frame: CGRect(x: 0, y: 0, width: tableView.bounds.size.width, height: 100))
        headerLabel.textAlignment = .center
        headerLabel.text = "Header"
        return header

    func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return 100

    func tableView(_ tableView: UITableView, viewForFooterInSection section: Int) -> UIView? {
        let view = UIView()
        view.backgroundColor = .white
        return view


class Cell: UITableViewCell {

    let label : UILabel = {
        let label = UILabel()
        label.text = "One Label"
        return label

    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        self.backgroundColor = .clear

    func setupViews() {
        self.backgroundColor = .white
        label.frame = self.frame

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")

class Header : UITableViewHeaderFooterView {

    override init(reuseIdentifier: String?) {
        super.init(reuseIdentifier: reuseIdentifier)

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")

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