• Storyboard is a new IB file, which allows you to view the entire UI of your app in one place, including the transitions between the parts of your app and the triggers that initiated those transitions, so you can very conveniently get an overview of the app.
• Storyboards build on the familiar nib concept, and are edited in the same way, using Xcodeís Interface Builder.
• But unlike nibs, storyboards also allow you to work with multiple views, each attached to its own view controller, in a single visual workspace.
  

• A storyboard is a visual representation of the user interface of an iOS application, showing screens of content and the connections between those screens.
• A storyboard is composed of a sequence of scenes, each of which represents a view controller and its views; scenes are connected by segue objects, which represent a transition between two view controllers.
  
• A Scene Corresponds to a Single View Controller and Its Views
• A Segue Manages the Transition Between Two Scenes
  

• Select SE screen size
• Fit the image to the entire screen
• Select 'Add Missing Constraints'
  

• Page View has 'predefined' 'fixed' number of pages
• UIPageViewController
• Follow Chapter 19 pp538-552
• C14-pageview

class MyPageViewController: UIPageViewController, UIPageViewControllerDataSource {

    var controllerArray: [UIViewController]? = nil
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        dataSource = self
        let storyBoard = UIStoryboard(name: "Main", bundle: nil)
        let firstVC = storyBoard.instantiateViewController(withIdentifier: "page01")
        let secondVC = storyBoard.instantiateViewController(withIdentifier: "page02")
        let thirdVC = storyBoard.instantiateViewController(withIdentifier: "page03")
        controllerArray = [firstVC, secondVC, thirdVC]
        self.setViewControllers([controllerArray![0]], direction: UIPageViewController.NavigationDirection.forward, animated: true, completion: nil)
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
        guard let vcIndex = controllerArray!.firstIndex(of: viewController) else {
            return nil
        }
        let preIndex = vcIndex - 1
        guard preIndex >= 0 else {
            return controllerArray!.last // loops back to end
        }
        guard controllerArray!.count > preIndex else { return nil
        }
        return controllerArray![preIndex]
    }
    
    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
        guard let vcIndex = controllerArray!.firstIndex(of: viewController) else {
            return nil
        }
        let nextIndex = vcIndex + 1
        guard controllerArray!.count != nextIndex else {
            return controllerArray!.first // loops back to beginning
        }
        guard controllerArray!.count > nextIndex else { return nil
        }
        return controllerArray![nextIndex]
    }
}	

	override func viewDidLoad() {
        super.viewDidLoad()
        setupPageControl()
        
        dataSource = self
		...
	}
    func presentationCount(for pageViewController: UIPageViewController) -> Int {
        return (controllerArray?.count)!
    }
    
    func presentationIndex(for pageViewController: UIPageViewController) -> Int {
        return 0
    }
    
    private func setupPageControl() {
        let appearance = UIPageControl.appearance()
        appearance.pageIndicatorTintColor = UIColor.gray
        appearance.currentPageIndicatorTintColor = UIColor.white
        appearance.backgroundColor = UIColor.black
    }

• TableView
• TabBar
• PageView

• Declarative
• Automatic
• Composition
• Consistent