Trio/Dependencies/MKRingProgressView/Example/ActivityRingsExample/ViewController.swift

//
//  ViewController.swift
//  MKRingProgressViewExample
//
//  Created by Max Konovalov on 20/10/15.
//  Copyright © 2015 Max Konovalov. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var groupContainerView: UIView!
    @IBOutlet weak var progressGroup: RingProgressGroupView!
    
    @IBOutlet weak var iconsHeightConstraint: NSLayoutConstraint!
    
    var buttons = [RingProgressGroupButton]()
    var selectedIndex = 0
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let containerView = UIView(frame: navigationController!.navigationBar.bounds)
        navigationController!.navigationBar.addSubview(containerView)

        // These are optional and only serve to improve accessibility
        progressGroup.ring1.accessibilityLabel = NSLocalizedString("Move", comment: "")
        progressGroup.ring2.accessibilityLabel = NSLocalizedString("Exercise", comment: "")
        progressGroup.ring3.accessibilityLabel = NSLocalizedString("Stand", comment: "")

        let n = 7
        for i in 0..<n {
            let w = (containerView.bounds.width - 16) / CGFloat(n)
            let h = containerView.bounds.height
            let button = RingProgressGroupButton(frame: CGRect(x: 8 + CGFloat(i) * w, y: 0, width: w, height: h))
            button.contentView.ringWidth = 4.5
            button.contentView.ringSpacing = 1
            button.contentView.ring1StartColor = progressGroup.ring1StartColor
            button.contentView.ring1EndColor = progressGroup.ring1EndColor
            button.contentView.ring2StartColor = progressGroup.ring2StartColor
            button.contentView.ring2EndColor = progressGroup.ring2EndColor
            button.contentView.ring3StartColor = progressGroup.ring3StartColor
            button.contentView.ring3EndColor = progressGroup.ring3EndColor
            containerView.addSubview(button)
            buttons.append(button)
            button.addTarget(self, action: #selector(ViewController.buttonTapped(_:)), for: .touchUpInside)
        }

        buttons[0].isSelected = true

        updateButtonsProgress()
    }


    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        updateMainGroupProgress(delay: 0.5)
    }

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        iconsHeightConstraint.constant = progressGroup.ringWidth * 3 + progressGroup.ringSpacing * 2
    }
    
    @objc func buttonTapped(_ sender: RingProgressGroupButton) {
		let newIndex = buttons.firstIndex(of: sender) ?? 0
        if newIndex == selectedIndex {
            return
        }
        
        let dx = (newIndex > selectedIndex) ? -self.view.frame.width : self.view.frame.width
        
        buttons[selectedIndex].isSelected = false
        sender.isSelected = true
        selectedIndex = newIndex
        
        UIView.animate(withDuration: 0.2, delay: 0.0, usingSpringWithDamping: 0.9, initialSpringVelocity: 0.0, options: [], animations: { () -> Void in
            self.groupContainerView.transform = CGAffineTransform(translationX: dx, y: 0)
        }) { (_) -> Void in
            self.groupContainerView.transform = CGAffineTransform(translationX: -dx, y: 0)
            self.progressGroup.ring1.progress = 0.0
            self.progressGroup.ring2.progress = 0.0
            self.progressGroup.ring3.progress = 0.0
            UIView.animate(withDuration: 0.3, delay: 0.0, usingSpringWithDamping: 0.9, initialSpringVelocity: 0.0, options: [], animations: { () -> Void in
                self.groupContainerView.transform = CGAffineTransform.identity
            }, completion: { (_) -> Void in
                self.updateMainGroupProgress()
            })
        }
    }

    private func updateButtonsProgress() {
        UIView.animate(withDuration: 0.5) {
            for button in self.buttons {
                button.contentView.ring1.progress = Double(arc4random() % 200) / 100.0
                button.contentView.ring2.progress = Double(arc4random() % 200) / 100.0
                button.contentView.ring3.progress = Double(arc4random() % 200) / 100.0
            }
        }
    }

    private func updateMainGroupProgress(delay: TimeInterval = 0.0) {
        let selectedGroup = buttons[selectedIndex]
        UIView.animate(withDuration: 1.0, delay: delay, usingSpringWithDamping: 1.0, initialSpringVelocity: 0.0, options: [], animations: {
            self.progressGroup.ring1.progress = selectedGroup.contentView.ring1.progress
            self.progressGroup.ring2.progress = selectedGroup.contentView.ring2.progress
            self.progressGroup.ring3.progress = selectedGroup.contentView.ring3.progress
        }, completion: nil)
    }
    
    @IBAction func randomize(_ sender: AnyObject? = nil) {
        updateButtonsProgress()
        updateMainGroupProgress()
    }

}