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//
// CustomSwitch.swift
// MullvadVPN
//
// Created by pronebird on 20/05/2021.
// Copyright © 2021 Mullvad VPN AB. All rights reserved.
//
import UIKit
class CustomSwitch: UISwitch {
/// Returns the private `UISwitch` background view
private var backgroundView: UIView? {
// Go two levels deep only
let subviewsToExamine = subviews.flatMap { (view) -> [UIView] in
return [view] + view.subviews
}
// Find the first subview that has background color set.
let backgroundView = subviewsToExamine.first { (subview) in
return subview.backgroundColor != nil
}
return backgroundView
}
override init(frame: CGRect) {
super.init(frame: frame)
tintColor = .clear
onTintColor = .clear
if #available(iOS 13.0, *) {
overrideUserInterfaceStyle = .light
}
updateThumbColor(isOn: self.isOn, animated: false)
addTarget(self, action: #selector(valueChanged(_:)), for: .valueChanged)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func setOn(_ on: Bool, animated: Bool) {
super.setOn(on, animated: animated)
updateThumbColor(isOn: on, animated: animated)
}
private func updateThumbColor(isOn: Bool, animated: Bool) {
let actions = {
self.thumbTintColor = isOn ? UIColor.Switch.onThumbColor : UIColor.Switch.offThumbColor
self.backgroundView?.backgroundColor = .clear
}
if animated {
UIView.animate(withDuration: 0.25, animations: actions)
} else {
actions()
}
}
@objc private func valueChanged(_ sender: Any) {
if #available(iOS 13, *) {
updateThumbColor(isOn: isOn, animated: true)
} else {
// Wait for animations to finish before changing the thumb color to prevent the jumpy behaviour.
CATransaction.setCompletionBlock {
self.updateThumbColor(isOn: self.isOn, animated: false)
}
}
}
}
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