Absinthe-iOS-Swift3/IntroSlidesViewController.swift at master · Overplay/Absinthe-iOS-Swift3 · GitHub

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//
//  IntroSlidesViewController.swift
//  Absinthe-iOS-X8
//
//  Created by Alyssa Torres on 2/17/17.
//  Copyright © 2017 Ourglass. All rights reserved.
//
//  based on tutorial: http://sweettutos.com/2015/04/13/how-to-make-a-horizontal-paging-uiscrollview-with-auto-layout-in-storyboards-swift/

import UIKit

class IntroSlidesViewController: UIViewController, UIScrollViewDelegate {

    let slideImages: [UIImage] = [
        UIImage(named: "TestSlide1")!,
        UIImage(named: "TestSlide3")!,
        UIImage(named: "TestSlide4")!
    ]

    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet weak var pageControl: UIPageControl!
    @IBOutlet weak var startButton: UIButton!

    @IBAction func cancel(_ sender: Any) {
        DispatchQueue.main.async(execute: {
            self.performSegue(withIdentifier: "fromIntroToReg", sender: nil)
        })
    }

    @IBAction func start(_ sender: Any) {
        DispatchQueue.main.async(execute: {
            self.performSegue(withIdentifier: "fromIntroToReg", sender: nil)
        })
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        self.startButton.alpha = 0.0

        // set number of slides
        self.pageControl.numberOfPages = self.slideImages.count

        // set frame of scroll view to fill screen
        self.scrollView.frame = CGRect(x:0, y:0, width:self.view.frame.width, height:self.view.frame.height)
        let scrollViewWidth: CGFloat = self.scrollView.frame.width
        let scrollViewHeight: CGFloat = self.scrollView.frame.height

        // add slide images
        for (idx, slideImage) in self.slideImages.enumerated() {
            let x: CGFloat = scrollViewWidth * CGFloat(idx)
            let imageView = UIImageView(frame: CGRect(x:x, y:0, width:scrollViewWidth, height:scrollViewHeight))
            imageView.image = slideImage
            self.scrollView.addSubview(imageView)
        }

        // change content size of scroll view to fit slides
        self.scrollView.contentSize = CGSize(width:scrollViewWidth * CGFloat(self.slideImages.count), height:scrollViewHeight)

        self.scrollView.delegate = self
        self.pageControl.currentPage = 0
    }

    func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
        // test the offset and calculate the current page
        let pageWidth: CGFloat = self.scrollView.frame.width
        let currentPage: CGFloat = floor((self.scrollView.contentOffset.x-pageWidth/2)/pageWidth) + 1

        // change the page indicator
        self.pageControl.currentPage = Int(currentPage)

        /*if self.pageControl.currentPage == self.slideImages.count - 1 {
            self.startButton.alpha = 1.0
        } else {
            self.startButton.alpha = 0.0
        }*/
    }

    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        // test the offset and calculate the current page
        let pageWidth: CGFloat = self.scrollView.frame.width
        let currentPage: CGFloat = floor((self.scrollView.contentOffset.x-pageWidth/2)/pageWidth) + 1


        /*if Int(currentPage) == self.slideImages.count - 1 {
            self.startButton.alpha = 1.0
        } else {
            self.startButton.alpha = 0.0
        }*/
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}