ImageViewController.swift

//
//  ImageViewController.swift
//  Project30
//
//  Created by TwoStraws on 20/08/2016.
//  Copyright (c) 2016 TwoStraws. All rights reserved.
//

import UIKit

class ImageViewController: UIViewController {
    weak var owner: SelectionViewController!
    var image: String!
    var animTimer: Timer!

    var imageView: UIImageView!

    override func loadView() {
        super.loadView()

        view.backgroundColor = UIColor.black

        // create an image view that fills the screen
        imageView = UIImageView()
        imageView.contentMode = .scaleAspectFit
        imageView.translatesAutoresizingMaskIntoConstraints = false
        imageView.alpha = 0

        view.addSubview(imageView)

        // make the image view fill the screen
        imageView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
        imageView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
        imageView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
        imageView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor).isActive = true

        // schedule an animation that does something vaguely interesting
        animTimer = Timer.scheduledTimer(withTimeInterval: 5, repeats: true) { _ in
            // do something exciting with our image
            self.imageView.transform = CGAffineTransform.identity

            UIView.animate(withDuration: 3) {
                self.imageView.transform = CGAffineTransform(scaleX: 0.8, y: 0.8)
            }
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        title = image.replacingOccurrences(of: "-Large.jpg", with: "")

        // When you use this code the image is loaded into an image content cache for later reuse, but we aren't going to use it again!

        guard let path = Bundle.main.path(forResource: image, ofType: nil) else { return }

        guard let original = UIImage(contentsOfFile: path) else { return }

        let renderer = UIGraphicsImageRenderer(size: original.size)

        let rounded = renderer.image { ctx in
            ctx.cgContext.addEllipse(in: CGRect(origin: CGPoint.zero, size: original.size))
            ctx.cgContext.closePath()

            original.draw(at: CGPoint.zero)
        }

        imageView.image = rounded
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        imageView.alpha = 0

        UIView.animate(withDuration: 3) { [unowned self] in
            self.imageView.alpha = 1
        }
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        animTimer.invalidate()
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        let defaults = UserDefaults.standard
        var currentVal = defaults.integer(forKey: image)
        currentVal += 1

        defaults.set(currentVal, forKey: image)

        // tell the parent view controller that it should refresh its table counters when we go back
        owner.dirty = true
    }
}