NetNewsWire/iOS/UIKit Extensions/TickMarkSlider.swift

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//
// TickMarkSlider.swift
// NetNewsWire-iOS
//
// Created by Maurice Parker on 11/8/19.
// Copyright © 2019 Ranchero Software. All rights reserved.
//
import UIKit
class TickMarkSlider: UISlider {
private var enableFeedback = false
private let feedbackGenerator = UISelectionFeedbackGenerator()
private var roundedValue: Float?
override var value: Float {
didSet {
let testValue = value.rounded()
if testValue != roundedValue && enableFeedback && value.truncatingRemainder(dividingBy: 1) == 0 {
roundedValue = testValue
feedbackGenerator.selectionChanged()
}
}
}
func addTickMarks() {
enableFeedback = true
let numberOfGaps = Int(maximumValue) - Int(minimumValue)
var gapLayoutGuides = [UILayoutGuide]()
for i in 0...numberOfGaps {
let tick = UIView()
tick.translatesAutoresizingMaskIntoConstraints = false
tick.backgroundColor = AppAssets.tickMarkColor
insertSubview(tick, at: 0)
tick.widthAnchor.constraint(equalToConstant: 3).isActive = true
tick.heightAnchor.constraint(equalToConstant: 10).isActive = true
tick.centerYAnchor.constraint(equalTo: self.centerYAnchor).isActive = true
if i == 0 {
tick.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
}
if let lastGapLayoutGuild = gapLayoutGuides.last {
lastGapLayoutGuild.trailingAnchor.constraint(equalTo: tick.leadingAnchor).isActive = true
}
if i != numberOfGaps {
let gapLayoutGuild = UILayoutGuide()
gapLayoutGuides.append(gapLayoutGuild)
addLayoutGuide(gapLayoutGuild)
tick.trailingAnchor.constraint(equalTo: gapLayoutGuild.leadingAnchor).isActive = true
} else {
tick.trailingAnchor.constraint(equalTo: trailingAnchor).isActive = true
}
}
if let firstGapLayoutGuild = gapLayoutGuides.first {
for i in 1..<gapLayoutGuides.count {
gapLayoutGuides[i].widthAnchor.constraint(equalTo: firstGapLayoutGuild.widthAnchor).isActive = true
}
}
}
override func continueTracking(_ touch: UITouch, with event: UIEvent?) -> Bool {
let result = super.continueTracking(touch, with: event)
value = value.rounded()
return result
}
override func endTracking(_ touch: UITouch?, with event: UIEvent?) {
value = value.rounded()
}
}