Reproducing Popular iOS Controls - Part 20: | Ray Wenderlich Videos

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1

This video will teach you how to hook up the interactive graph with the ticker and create a seamlessy scrolling price.

This is a companion discussion topic for the original entry at https://www.raywenderlich.com/5298-reproducing-popular-ios-controls/lessons/20
2

Great tutorial. I believe there’s a bug around this code:

      if !cell.isScrolling {
        cell.tableView.scrollToRow(at: charIndexPath, at: .middle, animated: true)
      }

If you scroll fast enough on the graph view, the graph and ticker values could mismatch since we’re skipping some values.

3

Yep, that’s true! Would have to make sure to move to the correct number once we detect a full stop! We can tap into the scroll view methods to detect whether the user has stopped and make sure that we’re showing the right number.

4

Great Tutorial.

For Xcode v9.4.1:

  1. AppDelegate.swift:

CHANGE

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
   return true
 }

TO

 func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    return true
 }
  1. ViewController.swift - Line: 64

CHANGE

    addChild(tickerControl)

TO

    addChildViewController(tickerControl)
  1. ViewController.swift - LINE: 75

CHANGE

    tickerControl.didMove(toParent: self)

TO

    tickerControl.didMove(toParentViewController: self)
  1. TickerCell.swift - LINE: 45

CHANGE

override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
    super.init(style: style, reuseIdentifier: reuseIdentifier)
    setUpViews()
}

TO

  override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
    super.init(style: style, reuseIdentifier: reuseIdentifier)
    setUpViews()
  }
5

@adm73 Thank you for performing the changes - much appreciated!