/*

    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 `UISegmentedControl`.

*/

import UIKit

class SegmentedControlsViewController: UIViewController {

    // MARK: Properties

    @IBOutlet weak var plainSegmentedControl: UISegmentedControl!

    @IBOutlet weak var customBackgroundSegmentedControl: UISegmentedControl!

    override var preferredFocusEnvironments: [UIFocusEnvironment] {

        return [plainSegmentedControl]

    }

    override func viewDidLoad() {

        super.viewDidLoad()

        configureCustomBackgroundSegmentedControl()

    }

    private func configureCustomBackgroundSegmentedControl() {

        // Set the background images for each control state.

        let normalSegmentBackgroundImage = UIImage(named: "stepper_and_segment_background")

        customBackgroundSegmentedControl.setBackgroundImage(normalSegmentBackgroundImage, for: UIControlState(), barMetrics: .default)

        let disabledSegmentBackgroundImage = UIImage(named: "stepper_and_segment_background_disabled")

        customBackgroundSegmentedControl.setBackgroundImage(disabledSegmentBackgroundImage, for: .disabled, barMetrics: .default)

        let highlightedSegmentBackgroundImage = UIImage(named: "stepper_and_segment_background_highlighted")

        customBackgroundSegmentedControl.setBackgroundImage(highlightedSegmentBackgroundImage, for: .highlighted, barMetrics: .default)

        // Set the divider image.

        let segmentDividerImage = UIImage(named: "stepper_and_segment_divider")

        customBackgroundSegmentedControl.setDividerImage(segmentDividerImage, forLeftSegmentState: UIControlState(), rightSegmentState: UIControlState(), barMetrics: .default)

        // Create a font to use for the attributed title (both normal and highlighted states).

        let captionFontDescriptor = UIFontDescriptor.preferredFontDescriptor(withTextStyle: UIFontTextStyle.caption1)

        let font = UIFont(descriptor: captionFontDescriptor, size: 0)

        let normalTextAttributes = [

            NSForegroundColorAttributeName: UIColor.purple,

            NSFontAttributeName: font

        ]

        customBackgroundSegmentedControl.setTitleTextAttributes(normalTextAttributes, for: UIControlState())

        let highlightedTextAttributes = [

            NSForegroundColorAttributeName: UIColor.purple,

            NSFontAttributeName: font

        ]

        customBackgroundSegmentedControl.setTitleTextAttributes(highlightedTextAttributes, for: .highlighted)

    }

}