Kayouyou's Den

• 1. Managing View Controllers With Container View Controllers
  • 1.1. MasterViewController.swift
  • 1.2. Adding a Child View Controller
  • 1.3. Removing a Child View Controller
  • 1.4. Updating the View

1. Managing View Controllers With Container View Controllers

1.1. MasterViewController.swift

import UIKit

final class MasterViewController: UIViewController {

    @IBOutlet var segmentedControl: UISegmentedControl!

    override func viewDidLoad() {
        super.viewDidLoad()
        setupView()
    }

    private func setupView() {
        setupSegmentedControl()
    }

    private func setupSegmentedControl() {
        // Configure Segmented Control
        segmentedControl.removeAllSegments()
        segmentedControl.insertSegment(withTitle: "Summary", at: 0, animated: false)
        segmentedControl.insertSegment(withTitle: "Sessions", at: 1, animated: false)
        segmentedControl.addTarget(self, action: #selector(selectionDidChange(_:)), for: .valueChanged)

        // Select First Segment
        segmentedControl.selectedSegmentIndex = 0
    }

    func selectionDidChange(_ sender: UISegmentedControl) {
        updateView()
    }
}

1.2. Adding a Child View Controller

private lazy var summaryViewController: SummaryViewController = {
    // Load Storyboard
    let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)

    // Instantiate View Controller
    var viewController = storyboard.instantiateViewController(withIdentifier: "SummaryViewController") as! SummaryViewController

    // Add View Controller as Child View Controller
    self.add(asChildViewController: viewController)

    return viewController
}()

private lazy var sessionsViewController: SessionsViewController = {
    // Load Storyboard
    let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)

    // Instantiate View Controller
    var viewController = storyboard.instantiateViewController(withIdentifier: "SessionsViewController") as! SessionsViewController

    // Add View Controller as Child View Controller
    self.add(asChildViewController: viewController)

    return viewController
}()

private func add(asChildViewController viewController: UIViewController) {
    // Add Child View Controller
    addChildViewController(viewController)

    // Add Child View as Subview
    view.addSubview(viewController.view)

    // Configure Child View
    viewController.view.frame = view.bounds
    viewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]

    // Notify Child View Controller
    viewController.didMove(toParentViewController: self)
}

1.3. Removing a Child View Controller

private func remove(asChildViewController viewController: UIViewController) {
    // Notify Child View Controller
    viewController.willMove(toParentViewController: nil)

    // Remove Child View From Superview
    viewController.view.removeFromSuperview()

    // Notify Child View Controller
    viewController.removeFromParentViewController()
}

1.4. Updating the View

private func updateView() {
    if segmentedControl.selectedSegmentIndex == 0 {
        remove(asChildViewController: sessionsViewController)
        add(asChildViewController: summaryViewController)
    } else {
        remove(asChildViewController: summaryViewController)
        add(asChildViewController: sessionsViewController)
    }
}

func setupView() {
    setupSegmentedControl()
    updateView()
}

参考链接