Lesson 002. Practice.

[ozalexo]

Lesson 002. Practice.

[ozalexo]

Lesson 002: Preservation и Restoration техники, стек UINavigationController, Life cycles

Practice 001. Application life cycle (App Delegate)

• Webinar timeframes 00:00:00 – 00:27:50
• Self test: added "Exit" button.
• GitHub branch

Practice 002. UIViewController lifecycle

• Webinar timeframes: 00:27:50 - 00:41:50
• GitHub branch

Practice 003. ViewControllerLifeCycleBehavior

• Webinar timeframes: 00:47:27 - 01:03:05
• GitHub branch

Practice 004. UIResponder and Responder chain

• Webinar timeframes: 01:03:05 - 01:21:15
• GitHub branch

Practice 005. UINavigation stack

• Webinar timeframes: 01:21:15 - 01:40:00
• GitHub branch

QA

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❔ How to use willFinishLaunchingWithOptions? I don't want just copy-paste it from lessons's example. Need to dig it out.

❕ Type func willFinishLaunchingWithOption and wait for XCode autocompletition

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❔XCode 11 beta. New "Single View App" project (with Swift UI checkbox) generates two files AppDelegate.swift and SceneDelegate.swift. Need to understand how it works (in parallel or step-by-step, depneds on ios version or not etc.)

❕First of all, AppDelegate's methods willFinishLaunchingWithOption and
didFinishLaunchingWithOptions, then sceneWIllEnterForeground etc.

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❓How to use method hitTest to get info which TextField was touched? Did not found appropriate info. Also I need more info about drag and drop.

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❓Why segues push and modal marked as deprecated in XCode11?

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❓How to implement return back to two screens?

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❓presentViewController etc: where to read about it?

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❓implemented pop with reomve from stack:
Title of 'Back' button is a title of previous screen. On display next controller I can see how title changin from VC2 to VC1. How to prevent this behaviour and replace title before it will be shown?

❗️

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❔let newControllers = controllers.filter { !($0 is VC2ViewController) }
What is $0 in this line?

❕This is each item of iterable type (Array, for example). See also: https://habr.com/ru/post/440722/

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Notes

Practice 004

• UIResponder is superclass for UIWindow, UIApplication, UIView and UIViewController
• UIResponder handles all UI events: touch, scroll, swipe, keyboard input etc.
• UIResponder chain is like bubbling in browsers: View -> ViewController -> Window -> Application
• Common example of UIResponder: UITextField input
  1. UITextField.becomeFirstReponder calls automatically on tap on UIText
  2. If we need to switch to a next Text field:
     UITextFirst.resignFirstReponder() UITextSecond.becomeFirtsResponder()
  3. Actually we do not need to call resignFirstReponder, it is enough to call becomeFirtsResponder (will be resigned automatically)
• Check that UITextField is firstResponder: textFieldOne.isFirstResponder
• Any UIKit event handle by:
  • func touchesBegan()
  • func touchesMoved()
  • func touchesEnded()
  • func touchesCancelled()