/*

    Copyright (C) 2017 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    A view controller that demonstrates how to use `UIButton`. The buttons are created using storyboards, but the attributed text button has its text set in code.

*/

import UIKit

class ButtonsViewController: UIViewController {

    // MARK: Properties

    @IBOutlet weak var systemButton: UIButton!

    @IBOutlet weak var attributedTextButton: UIButton!

    override var preferredFocusEnvironments: [UIFocusEnvironment] {

        return [systemButton]

    }

    // MARK: UIViewController

    override func viewDidLoad() {

        super.viewDidLoad()

        configureAttributedTextSystemButton()

    }

    // MARK: IB Actions

    @IBAction func buttonClicked(_ sender: AnyObject) {

        /*

            Clicking a button fires a UIControlEventPrimaryActionTriggered event.

            The buttons in this view controller have been setup in Interface Builder

            to call this action for the UIControlEventPrimaryActionTriggered event.

        */

        print("A button was clicked.")

    }

    // MARK: Convenience

    private func configureAttributedTextSystemButton() {

        let buttonTitle = NSLocalizedString("Button", comment: "")

        // Set the button's title for normal state.

        let normalTitleAttributes: [String : Any] = [

            NSForegroundColorAttributeName: UIColor.blue,

            NSStrikethroughStyleAttributeName: NSUnderlineStyle.styleSingle.rawValue

        ]

        let normalAttributedTitle = NSAttributedString(string: buttonTitle, attributes: normalTitleAttributes)

        attributedTextButton.setAttributedTitle(normalAttributedTitle, for: UIControlState())

        // Set the button's title for highlighted state.

        let highlightedTitleAttributes: [String : Any] = [

            NSForegroundColorAttributeName: UIColor.green,

            NSStrikethroughStyleAttributeName: NSUnderlineStyle.styleThick.rawValue

        ]

        let highlightedAttributedTitle = NSAttributedString(string: buttonTitle, attributes: highlightedTitleAttributes)

        attributedTextButton.setAttributedTitle(highlightedAttributedTitle, for: .highlighted)

    }

}