Onboard.swift

//
//  something.swift
//  
//
//  Created by John Cederholm on 3/5/17.
//  Copyright © 2017 John Cederholm. All rights reserved.
//

import Foundation


class Onboarder: OnboardingViewController {
    var firstBackground: UIImageView!
    var firstImage:UIImage!
    var secondBackground:UIImageView!
    var secondImage:UIImage!
    var thirdBackground:UIImageView!
    var thirdImage:UIImage!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        createOtherBackgrounds()
    }
    
    func createOtherBackgrounds() {
        firstBackground = UIImageView(frame: self.view.bounds)
        firstBackground.clipsToBounds = true
        firstBackground.contentMode = .scaleAspectFill
        firstBackground.image = UIImage(named: "BackgroundImageOne")
        firstBackground.alpha = 1
        self.view.addSubview(firstBackground)
        
        
        secondBackground = UIImageView(frame: self.view.bounds)
        secondBackground.clipsToBounds = true
        secondBackground.contentMode = .scaleAspectFill
        secondBackground.image = UIImage(named: "BackgroundImageTwo")
        secondBackground.alpha = 0
        self.view.addSubview(secondBackground)
        
        thirdBackground = UIImageView(frame: self.view.bounds)
        thirdBackground.clipsToBounds = true
        thirdBackground.contentMode = .scaleAspectFill
        thirdBackground.image = UIImage(named: "BackgroundImageThree")
        thirdBackground.alpha = 0
        self.view.addSubview(thirdBackground)
        
        self.view.sendSubview(toBack: firstBackground)
        self.view.sendSubview(toBack: secondBackground)
        self.view.sendSubview(toBack: thirdBackground)
    }
    
    class func getOnboard() -> Onboarder {
        var onboardingVC = Onboarder()
        
        let oneT = "TitleOne"
        let oneB = ""
        let oneI = UIImage()
        let oneBT = ""
        let oneA = {}
        let fP = OnboardingContentViewController.content(withTitle: oneT, body: oneB, image: oneI, buttonText: oneBT, action: oneA)
        
        let twoT = "TitleTwo"
        let twoB = ""
        let twoI = UIImage()
        let twoBT = ""
        let twoA = {}
        let sP = OnboardingContentViewController.content(withTitle: twoT, body: twoB, image: twoI, buttonText: twoBT, action: twoA)
        
        let threeT = "TitleThree"
        let threeB = ""
        let threeI = UIImage()
        let threeBT = ""
        let threeA = {}
        let tP = OnboardingContentViewController.content(withTitle: threeT, body: threeB, image: threeI, buttonText: threeBT, action: threeA)
        
        onboardingVC = Onboarder.onboard(withBackgroundImage: nil, contents: [fP, sP, tP])
        onboardingVC.shouldFadeTransitions = true
        onboardingVC.shouldMaskBackground = true
        onboardingVC.shouldBlurBackground = false
        onboardingVC.fadePageControlOnLastPage = true
        onboardingVC.pageControl.pageIndicatorTintColor = UIColor.darkGray
        onboardingVC.pageControl.currentPageIndicatorTintColor = UIColor.white
        onboardingVC.skipButton.setTitleColor(UIColor.white, for: .normal)
        onboardingVC.allowSkipping = true
        onboardingVC.fadeSkipButtonOnLastPage = true
        
        onboardingVC.skipHandler = {
            onboardingVC.skip()
        }

        return onboardingVC
    }
    
    func skip() {
        self.setupNormalRoot()
    }
    
    
    
    func setupNormalRoot() {
        let mainSB:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let vc = mainSB.instantiateViewController(withIdentifier: "Initial")
        guard let window = UIApplication.shared.keyWindow else {return}
        guard let rootViewController = window.rootViewController else {return}
        vc.view.frame = rootViewController.view.frame
        vc.view.layoutIfNeeded()
        UserDefaults.standard.set(true, forKey: onboarded)
        
        UIView.transition(with: window, duration: 0.3, options: .transitionCrossDissolve, animations: {
            window.rootViewController = vc
        }, completion: { completed in
            // maybe do something here
        })
    }
    
    override func scrollViewDidScroll(_ scrollView: UIScrollView) {
        super.scrollViewDidScroll(scrollView)
        let percentComplete = fabs(scrollView.contentOffset.x - self.view.frame.size.width) / self.view.frame.size.width
        if percentComplete == 0 {return}
        switch pageControl.currentPage {
        case 0:
            if scrollView.contentOffset.x < self.view.bounds.width {
                return
            } else {
              secondBackground.alpha = percentComplete
              firstBackground.alpha = 1 - percentComplete
            }
        case 1:
            if scrollView.contentOffset.x < (self.view.bounds.width) {
                secondBackground.alpha = 1 - percentComplete
                firstBackground.alpha = percentComplete
            } else if scrollView.contentOffset.x >= (self.view.bounds.width) {
                secondBackground.alpha = 1 - percentComplete
                thirdBackground.alpha = percentComplete
            }
        case 2:
            if scrollView.contentOffset.x < (self.view.bounds.width) {
                thirdBackground.alpha = 1 - percentComplete
                secondBackground.alpha = percentComplete
            } else if scrollView.contentOffset.x >= (self.view.bounds.width) {
                return
            }
        default: break
        }
    }

    override func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
        super.pageViewController(pageViewController, didFinishAnimating: finished, previousViewControllers: previousViewControllers, transitionCompleted: completed)
        switch self.pageControl.currentPage {
        case 0:
            firstBackground.alpha = 1
            secondBackground.alpha = 0
            thirdBackground.alpha = 0
        case 1:
            firstBackground.alpha = 0
            secondBackground.alpha = 1
            thirdBackground.alpha = 0
        case 2:
            firstBackground.alpha = 0
            secondBackground.alpha = 0
            thirdBackground.alpha = 1
        default: break
        }
    }
    
}