OnboardingController.swift

//
//  OnboardingController.swift
//  Onboarding

import UIKit

class OnboardingController: UICollectionViewController, UICollectionViewDelegateFlowLayout {
    
    override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
        super.viewWillTransition(to: size, with: coordinator)
        guard let flowLayout = collectionView?.collectionViewLayout as? UICollectionViewFlowLayout else {
            return
        }
        flowLayout.invalidateLayout()
    }
    
    let onboardingPages = [
        Onboarding(headerLabelText: "Welcome", footerForwardButtonText: "Begin", footerBackButtonText: nil),
        Onboarding(headerLabelText: "Server Configuration", footerForwardButtonText: "Connect", footerBackButtonText: nil),
        Onboarding(headerLabelText: "Choose Facility", footerForwardButtonText: "Next", footerBackButtonText: "Back"),
        Onboarding(headerLabelText: "Choose Unit", footerForwardButtonText: "Next", footerBackButtonText: "Back"),
        Onboarding(headerLabelText: "Choose Room", footerForwardButtonText: "Save and launch", footerBackButtonText: "Back")
    ]

    override func viewDidLoad() {
        super.viewDidLoad()
        collectionView?.backgroundColor = .white
        collectionView?.register(OnboardingCell.self, forCellWithReuseIdentifier: OnboardingCell.cellId)
        collectionView?.isPagingEnabled = true
        collectionView?.isScrollEnabled = true
        collectionView?.showsHorizontalScrollIndicator = false
        collectionView?.showsVerticalScrollIndicator = false
    }

    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return onboardingPages.count
    }

    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: OnboardingCell.cellId, for: indexPath) as! OnboardingCell
        let page = onboardingPages[indexPath.item]
        cell.onboarding = page
        return cell
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: view.frame.width, height: view.frame.height)
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
        return 0
    }
    
}