418 lines
14 KiB
Swift
418 lines
14 KiB
Swift
//
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// Toggle.swift
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// VDS
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//
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// Created by Matt Bruce on 7/22/22.
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//
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import Foundation
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import UIKit
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import VDSColorTokens
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import Combine
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/**
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A custom implementation of Apple's UISwitch.
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By default this class begins in the off state.
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Container: The background of the toggle control.
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Knob: The circular indicator that slides on the container.
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*/
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@objcMembers open class VDSToggle: VDSControl, Modelable, Changable {
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public typealias ModelType = VDSToggleModel
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@Published open var model: ModelType = DefaultToggleModel()
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private var cancellable: AnyCancellable?
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//--------------------------------------------------
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// MARK: - Private Properties
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//--------------------------------------------------
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private var toggleTintColor: (on: UIColor, off: UIColor) {
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return getToggleColor(for: disabled, surface: surface)
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}
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private var knobTintColor: (on: UIColor, off: UIColor) {
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return getKnobColor(for: disabled, surface: surface)
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}
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private func getToggleColor(for disabled: Bool, surface: Surface) -> (on: UIColor, off: UIColor) {
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if disabled {
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if surface == .light {
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return (on: VDSColor.elementsDisabledOnlight, off: VDSColor.elementsDisabledOnlight)
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} else {
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return (on: VDSColor.elementsDisabledOnDark, off: VDSColor.elementsDisabledOnDark)
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}
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} else {
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if surface == .light {
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return (on: VDSColor.paletteGreen26, off: VDSColor.elementsSecondaryOnlight)
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} else {
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return (on: VDSColor.paletteGreen34, off: VDSColor.paletteGray44)
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}
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}
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}
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private func getKnobColor(for disabled: Bool, surface: Surface) -> (on: UIColor, off: UIColor) {
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if disabled {
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if surface == .light {
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return (on: VDSColor.paletteGray95, off: VDSColor.paletteGray95)
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} else {
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return (on: VDSColor.paletteGray44, off: VDSColor.paletteGray44)
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}
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} else {
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if surface == .light {
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return (on: VDSColor.elementsPrimaryOndark, off: VDSColor.elementsPrimaryOndark)
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} else {
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return (on: VDSColor.elementsPrimaryOndark, off: VDSColor.elementsPrimaryOndark)
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}
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}
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}
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private var showTextSpacing: CGFloat {
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showText ? 12 : 0
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}
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private var stackView: UIStackView = {
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let stackView = UIStackView()
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stackView.translatesAutoresizingMaskIntoConstraints = false
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stackView.axis = .horizontal
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stackView.distribution = .fillProportionally
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return stackView
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}()
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private var label: VDSLabel = {
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let label = VDSLabel()
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label.translatesAutoresizingMaskIntoConstraints = false
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return label
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}()
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private var toggleView: UIView = {
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let view = UIView()
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view.translatesAutoresizingMaskIntoConstraints = false
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return view
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}()
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private var knobView: UIView = {
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let view = UIView()
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view.translatesAutoresizingMaskIntoConstraints = false
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view.backgroundColor = .white
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return view
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}()
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//--------------------------------------------------
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// MARK: - Public Properties
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//--------------------------------------------------
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public var onChange: Blocks.ActionBlock?
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//--------------------------------------------------
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// MARK: - Static Properties
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//--------------------------------------------------
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// Sizes are from InVision design specs.
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public static var toggleSize = CGSize(width: 52, height: 24)
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public static var knobSize = CGSize(width: 20, height: 20)
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//--------------------------------------------------
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// MARK: - Computed Properties
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//--------------------------------------------------
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@Proxy(\.model.showText)
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public var showText: Bool {
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didSet {
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if oldValue != showText {
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ensureLabel()
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}
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}
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}
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@Proxy(\.model.onText)
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public var onText: String
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@Proxy(\.model.offText)
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public var offText: String
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@Proxy(\.model.textPosition)
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public var textPosition: VDSTextPosition {
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didSet {
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if oldValue != textPosition {
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ensureLabel()
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}
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}
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}
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@Proxy(\.model.fontSize)
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public var fontSize: VDSFontSize
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@Proxy(\.model.fontWeight)
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public var fontWeight: VDSFontWeight
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@Proxy(\.model.surface)
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public var surface: Surface
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@Proxy(\.model.on)
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open var isOn: Bool
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@Proxy(\.model.disabled)
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open var disabled: Bool
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open override var isEnabled: Bool {
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get { !model.disabled }
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set {
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//create local vars for clear coding
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let disabled = !newValue
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if model.disabled != disabled {
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model.disabled = disabled
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}
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}
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}
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//--------------------------------------------------
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// MARK: - Constraints
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//--------------------------------------------------
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private var knobLeadingConstraint: NSLayoutConstraint?
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private var knobTrailingConstraint: NSLayoutConstraint?
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private var knobHeightConstraint: NSLayoutConstraint?
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private var knobWidthConstraint: NSLayoutConstraint?
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private var toggleHeightConstraint: NSLayoutConstraint?
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private var toggleWidthConstraint: NSLayoutConstraint?
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//--------------------------------------------------
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// MARK: - Initializers
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//--------------------------------------------------
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public required init?(coder: NSCoder) {
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super.init(coder: coder)
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setup()
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}
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public override init(frame: CGRect) {
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super.init(frame: frame)
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setup()
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}
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public convenience override init() {
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self.init(frame: .zero)
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setup()
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}
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func setup() {
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cancellable = $model.debounce(for: .seconds(ModelStateDebounce), scheduler: RunLoop.main).sink { [weak self] viewModel in
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self?.onStateChange(viewModel: viewModel)
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}
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}
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//functions
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//--------------------------------------------------
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// MARK: - Lifecycle
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//--------------------------------------------------
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public override func updateView(_ size: CGFloat) {
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super.updateView(size)
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let toggleSize = Self.toggleSize
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let knobSize = Self.knobSize
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toggleHeightConstraint?.constant = toggleSize.height
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toggleWidthConstraint?.constant = toggleSize.width
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knobHeightConstraint?.constant = knobSize.height
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knobWidthConstraint?.constant = knobSize.width
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toggleView.layer.cornerRadius = toggleSize.height / 2.0
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knobView.layer.cornerRadius = toggleSize.height / 2.0
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ensureLabel()
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}
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public override func setupView() {
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super.setupView()
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isAccessibilityElement = true
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accessibilityTraits = .button
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addSubview(stackView)
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let toggleSize = Self.toggleSize
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let knobSize = Self.knobSize
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toggleHeightConstraint = toggleView.heightAnchor.constraint(equalToConstant: toggleSize.height)
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toggleHeightConstraint?.isActive = true
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toggleWidthConstraint = toggleView.widthAnchor.constraint(equalToConstant: toggleSize.width)
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toggleWidthConstraint?.isActive = true
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toggleView.layer.cornerRadius = toggleSize.height / 2.0
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knobView.layer.cornerRadius = knobSize.height / 2.0
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toggleView.backgroundColor = toggleTintColor.off
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toggleView.addSubview(knobView)
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knobHeightConstraint = knobView.heightAnchor.constraint(equalToConstant: knobSize.height)
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knobHeightConstraint?.isActive = true
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knobWidthConstraint = knobView.widthAnchor.constraint(equalToConstant: knobSize.width)
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knobWidthConstraint?.isActive = true
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knobView.centerYAnchor.constraint(equalTo: toggleView.centerYAnchor).isActive = true
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knobView.topAnchor.constraint(greaterThanOrEqualTo: toggleView.topAnchor).isActive = true
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toggleView.bottomAnchor.constraint(greaterThanOrEqualTo: knobView.bottomAnchor).isActive = true
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//setup stackview
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if showText {
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stackView.addArrangedSubview(label)
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}
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ensureLabel()
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stackView.addArrangedSubview(toggleView)
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stackView.topAnchor.constraint(equalTo: topAnchor).isActive = true
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stackView.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
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stackView.trailingAnchor.constraint(equalTo: trailingAnchor).isActive = true
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stackView.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
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}
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func ensureLabel() {
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stackView.spacing = showTextSpacing
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if showText {
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if textPosition == .left {
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stackView.insertArrangedSubview(label, at: 0)
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} else {
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stackView.addArrangedSubview(label)
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}
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} else if stackView.subviews.contains(label) {
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label.removeFromSuperview()
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}
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}
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public override func reset() {
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super.reset()
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toggleView.backgroundColor = toggleTintColor.off
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knobView.backgroundColor = knobTintColor.off
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setAccessibilityLabel()
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onChange = nil
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}
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//--------------------------------------------------
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// MARK: - Actions
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//--------------------------------------------------
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open override func sendAction(_ action: Selector, to target: Any?, for event: UIEvent?) {
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super.sendAction(action, to: target, for: event)
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toggleAndAction()
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}
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open override func sendActions(for controlEvents: UIControl.Event) {
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super.sendActions(for: controlEvents)
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toggleAndAction()
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}
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/// This will toggle the state of the Toggle and execute the actionBlock if provided.
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public func toggleAndAction() {
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isOn.toggle()
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onChange?()
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}
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override open func accessibilityActivate() -> Bool {
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// Hold state in case User wanted isAnimated to remain off.
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guard isUserInteractionEnabled else { return false }
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sendActions(for: .touchUpInside)
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return true
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}
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//--------------------------------------------------
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// MARK: - UIResponder
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//--------------------------------------------------
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open override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
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UIView.animate(withDuration: 0.1, animations: {
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self.knobWidthConstraint?.constant += Constants.PaddingOne
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self.layoutIfNeeded()
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})
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}
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public override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
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knobReformAnimation()
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// Action only occurs of the user lifts up from withing acceptable region of the toggle.
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let value = 20.0
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guard let coordinates = touches.first?.location(in: self) else { return }
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guard coordinates.x > -value else { return }
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sendActions(for: .touchUpInside)
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}
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open override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
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knobReformAnimation()
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sendActions(for: .touchCancel)
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}
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//--------------------------------------------------
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// MARK: - Animations
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//--------------------------------------------------
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public func knobReformAnimation() {
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UIView.animate(withDuration: 0.1, animations: {
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self.knobWidthConstraint?.constant = Self.knobSize.width
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self.layoutIfNeeded()
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}, completion: nil)
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}
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/// Follow the SwiftUI View paradigm
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/// - Parameter viewModel: state
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open func onStateChange(viewModel: ModelType) {
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let enabled = !viewModel.disabled
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label.set(with: viewModel)
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label.text = viewModel.on ? viewModel.onText : viewModel.offText
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setAccessibilityHint(!viewModel.disabled)
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setAccessibilityValue(viewModel.on)
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//private func
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func constrainKnob(){
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self.knobLeadingConstraint?.isActive = false
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self.knobTrailingConstraint?.isActive = false
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if viewModel.on {
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self.knobTrailingConstraint = self.toggleView.trailingAnchor.constraint(equalTo: self.knobView.trailingAnchor, constant: 2)
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self.knobLeadingConstraint = self.knobView.leadingAnchor.constraint(greaterThanOrEqualTo: self.toggleView.leadingAnchor)
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} else {
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self.knobTrailingConstraint = self.toggleView.trailingAnchor.constraint(greaterThanOrEqualTo: self.knobView.trailingAnchor)
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self.knobLeadingConstraint = self.knobView.leadingAnchor.constraint(equalTo: self.toggleView.leadingAnchor, constant: 2)
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}
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self.knobTrailingConstraint?.isActive = true
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self.knobLeadingConstraint?.isActive = true
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self.knobWidthConstraint?.constant = Self.knobSize.width
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self.layoutIfNeeded()
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}
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let toggleColor = getToggleColor(for: viewModel.disabled, surface: viewModel.surface)
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let knobColor = getKnobColor(for: viewModel.disabled, surface: viewModel.surface)
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if viewModel.disabled {
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toggleView.backgroundColor = viewModel.on ? toggleColor.on : toggleColor.off
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knobView.backgroundColor = viewModel.on ? knobColor.on : knobColor.off
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constrainKnob()
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} else {
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UIView.animate(withDuration: 0.2, delay: 0.0, options: .curveEaseIn, animations: {
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self.toggleView.backgroundColor = viewModel.on ? toggleColor.on : toggleColor.off
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self.knobView.backgroundColor = viewModel.on ? knobColor.on : knobColor.off
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}, completion: nil)
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UIView.animate(withDuration: 0.33, delay: 0, usingSpringWithDamping: 0.7, initialSpringVelocity: 0.5, options: [], animations: {
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constrainKnob()
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}, completion: nil)
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}
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backgroundColor = viewModel.surface.color
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isUserInteractionEnabled = !viewModel.disabled
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setAccessibilityHint(enabled)
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setAccessibilityValue(viewModel.on)
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setAccessibilityLabel(viewModel.on)
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setNeedsLayout()
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layoutIfNeeded()
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}
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// MARK:- Modable
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open func set(with model: ModelType) {
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self.model = model
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}
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}
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