/*

    Copyright (C) 2015 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    A view controller that demonstrates how to use UIStepper.

*/

import UIKit

class StepperViewController: UITableViewController {

    // MARK: Properties

    @IBOutlet weak var defaultStepper: UIStepper!

    @IBOutlet weak var tintedStepper: UIStepper!

    @IBOutlet weak var customStepper: UIStepper!

    @IBOutlet weak var defaultStepperLabel: UILabel!

    @IBOutlet weak var tintedStepperLabel: UILabel!

    @IBOutlet weak var customStepperLabel: UILabel!

    // MARK: View Life Cycle

    override func viewDidLoad() {

        super.viewDidLoad()

        configureDefaultStepper()

        configureTintedStepper()

        configureCustomStepper()

    }

    // MARK: Configuration

    func configureDefaultStepper() {

        defaultStepper.value = 0

        defaultStepper.minimumValue = 0

        defaultStepper.maximumValue = 10

        defaultStepper.stepValue = 1

        defaultStepperLabel.text = "\(Int(defaultStepper.value))"

        defaultStepper.addTarget(self, action: "stepperValueDidChange:", forControlEvents: .ValueChanged)

    }

    func configureTintedStepper() {

        tintedStepper.tintColor = UIColor.applicationBlueColor()

        tintedStepperLabel.text = "\(Int(tintedStepper.value))"

        tintedStepper.addTarget(self, action: "stepperValueDidChange:", forControlEvents: .ValueChanged)

    }

    func configureCustomStepper() {

        // Set the background image.

        let stepperBackgroundImage = UIImage(named: "stepper_and_segment_background")

        customStepper.setBackgroundImage(stepperBackgroundImage, forState: .Normal)

        let stepperHighlightedBackgroundImage = UIImage(named: "stepper_and_segment_background_highlighted")

        customStepper.setBackgroundImage(stepperHighlightedBackgroundImage, forState: .Highlighted)

        let stepperDisabledBackgroundImage = UIImage(named: "stepper_and_segment_background_disabled")

        customStepper.setBackgroundImage(stepperDisabledBackgroundImage, forState: .Disabled)

        // Set the image which will be painted in between the two stepper segments (depends on the states of both segments).

        let stepperSegmentDividerImage = UIImage(named: "stepper_and_segment_divider")

        customStepper.setDividerImage(stepperSegmentDividerImage, forLeftSegmentState: .Normal, rightSegmentState: .Normal)

        // Set the image for the + button.

        let stepperIncrementImage = UIImage(named: "stepper_increment")

        customStepper.setIncrementImage(stepperIncrementImage, forState: .Normal)

        // Set the image for the - button.

        let stepperDecrementImage = UIImage(named: "stepper_decrement")

        customStepper.setDecrementImage(stepperDecrementImage, forState: .Normal)

        customStepperLabel.text = "\(Int(customStepper.value))"

        customStepper.addTarget(self, action: "stepperValueDidChange:", forControlEvents: .ValueChanged)

    }

    // MARK: Actions

    func stepperValueDidChange(stepper: UIStepper) {

        NSLog("A stepper changed its value: \(stepper).")

        // A mapping from a stepper to its associated label.

        let stepperMapping: [UIStepper: UILabel] = [

            defaultStepper: defaultStepperLabel,

            tintedStepper: tintedStepperLabel,

            customStepper: customStepperLabel

        ]

        stepperMapping[stepper]!.text = "\(Int(stepper.value))"

    }

}