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SahilSainiYMLSahilSainiYML
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[CM-1205] Add Stepper (SwiftUI) and Stepper Control (UIKit) (#2)
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+903
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‎Package.swift‎

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@@ -17,15 +17,17 @@ let package = Package(
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)
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],
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dependencies: [
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// Dependencies declare other packages that this package depends on.
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// .package(url: /* package url */, from: "1.0.0"),
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// For UI layout support, contrast ratio calculations.
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.package(url: "https://github.com/yml-org/YCoreUI.git", from: "1.4.0"),
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// For Typography support
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.package(url: "https://github.com/yml-org/YMatterType.git", from: "1.4.0")
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],
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targets: [
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// Targets are the basic building blocks of a package. A target can define a module or a test suite.
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// Targets can depend on other targets in this package, and on products in packages this package depends on.
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.target(
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name: "YStepper",
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dependencies: []
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dependencies: ["YCoreUI", "YMatterType"]
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),
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.testTarget(
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name: "YStepperTests",

‎Sources/YStepper/Enums/YStepper+Images.swift‎

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//
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// YStepper+Images.swift
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// YStepper
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//
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// Created by Sahil Saini on 07/03/23.
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// Copyright © 2023 Y Media Labs. All rights reserved.
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//
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import UIKit
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import YCoreUI
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/// Collection of Images
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enum Images: String, CaseIterable {
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case increment = "plus.circle"
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case decrement = "minus.circle"
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case delete = "trash.circle"
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}
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extension Images: ImageAsset {
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func loadImage() -> UIImage? {
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UIImage(systemName: rawValue)
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}
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}

‎Sources/YStepper/Protocols/StepperDelegate.swift‎

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//
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// StepperDelegate.swift
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// YStepper
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//
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// Created by Sahil Saini on 07/03/23.
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// Copyright © 2023 Y Media Labs. All rights reserved.
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//
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import Foundation
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/// Observes `Stepper` actions
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public protocol StepperDelegate: AnyObject {
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/// This method is used to inform when there is a change in value.
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/// - Parameter newValue: new value
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func valueDidChange(newValue: Double)
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}

‎Sources/YStepper/SwiftUI/Observers/Stepper+AppearanceObserver.swift‎

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//
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// Stepper+AppearanceObserver.swift
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// YStepper
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//
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// Created by Sahil Saini on 06/03/23.
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// Copyright © 2023 Y Media Labs. All rights reserved.
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//
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import Foundation
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// extension for appearance
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extension Stepper {
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class AppearanceObserver: ObservableObject {
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@Published var appearance: StepperControl.Appearance
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/// initializer for theme observer
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/// - Parameter appearance: appearance object
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init(appearance: StepperControl.Appearance = .default) {
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self.appearance = appearance
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}
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}
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}

‎Sources/YStepper/SwiftUI/Observers/Stepper+ValueObserver.swift‎

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//
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// Stepper+ValueObserver.swift
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// YStepper
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//
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// Created by Sahil Saini on 06/03/23.
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// Copyright © 2023 Y Media Labs. All rights reserved.
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//
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import Foundation
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// extension for appearance
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extension Stepper {
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class ValueObserver: ObservableObject {
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@Published var minimumValue: Double
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@Published var maximumValue: Double
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@Published var stepValue: Double
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@Published var value: Double
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@Published var decimalValue: Int
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init(
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minimumValue: Double = 0,
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maximumValue: Double = 100,
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stepValue: Double = 1,
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value: Double = 0,
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decimalValue: Int = 0
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) {
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self.minimumValue = minimumValue
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self.maximumValue = maximumValue
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self.stepValue = stepValue
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self.value = value
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self.decimalValue = decimalValue
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}
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}
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}

‎Sources/YStepper/SwiftUI/Views/Stepper.swift‎

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//
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// Stepper.swift
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// YStepper
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//
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// Created by Sahil Saini on 06/03/23.
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// Copyright © 2023 Y Media Labs. All rights reserved.
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//
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import SwiftUI
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import YMatterType
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/// A SwiftUI stepper control.
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public struct Stepper {
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enum ButtonType {
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case increment
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case decrement
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}
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let minimumSize: CGSize = CGSize(width: 44, height: 44)
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@ObservedObject private var appearanceObserver = Stepper.AppearanceObserver()
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@ObservedObject private var valueObserver = Stepper.ValueObserver()
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/// Receive value change notification
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public weak var delegate: StepperDelegate?
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/// Stepper appearance
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public var appearance: StepperControl.Appearance {
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get {
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self.appearanceObserver.appearance
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}
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set {
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self.appearanceObserver.appearance = newValue
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}
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}
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/// Optional minimum vale. Minimum possible value for the stepper.
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public var minimumValue: Double {
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get { valueObserver.minimumValue }
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set {
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onMinimumValueChange(newValue: newValue)
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}
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}
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/// Optional maximum value. Maximum possible value for the stepper.
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public var maximumValue: Double {
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get { valueObserver.maximumValue }
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set {
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onMaximumValueChange(newValue: newValue)
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}
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}
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/// Optional step value. The step, or increment, value for the stepper.
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public var stepValue: Double {
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get { valueObserver.stepValue }
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set { valueObserver.stepValue = newValue }
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}
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/// Stepper's current value
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public var value: Double {
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get { valueObserver.value }
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set { onValueChange(newValue: newValue) }
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}
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/// Decimal digits in current value
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public var decimalPlaces: Int {
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get { valueObserver.decimalValue }
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set { valueObserver.decimalValue = newValue }
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}
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/// Initializes Stepper
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/// - Parameters:
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/// - appearance: appearance for the stepper. Default is `.default`
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/// - minimumValue: minimum value. Default is `0`
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/// - maximumValue: maximum value. Default is `100`
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/// - stepValue: Step value. Default is `1`
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/// - value: Current value. Default is `0` or minimumValue (if provided)
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public init(
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appearance: StepperControl.Appearance = .default,
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minimumValue: Double = 0,
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maximumValue: Double = 100,
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stepValue: Double = 1,
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value: Double = 0
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) {
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self.appearance = appearance
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self.minimumValue = minimumValue
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self.maximumValue = maximumValue
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self.stepValue = stepValue
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self.value = (minimumValue...maximumValue).contains(value) ?
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minimumValue : value
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}
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}
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extension Stepper: View {
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/// :nodoc:
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public var body: some View {
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HStack(spacing: 0) {
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generateButton(buttonType: .decrement) {
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valueObserver.value -= stepValue
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updateCurrentValue(newValue: valueObserver.value)
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}
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TextStyleLabel(getValueText(), typography: appearance.textStyle.typography) { label in
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label.textAlignment = .center
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}.frame(minWidth: minimumSize.width, idealWidth: minimumSize.height)
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generateButton(buttonType: .increment) {
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valueObserver.value += stepValue
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updateCurrentValue(newValue: valueObserver.value)
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}
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}
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.background(
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Capsule()
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.strokeBorder(Color(appearance.borderColor), lineWidth: appearance.borderWidth)
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.background(Capsule().foregroundColor(Color(appearance.backgroundColor)))
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)
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}
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func generateButton(
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buttonType: ButtonType,
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action: @escaping () -> Void
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) -> some View {
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let button = Button(action: action) {
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switch buttonType {
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case .increment:
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getIncrementImage()
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case .decrement:
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getImageForDecrementButton()
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}
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}
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return button.frame(minWidth: minimumSize.width, minHeight: minimumSize.height)
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}
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}
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extension Stepper {
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func getValueText() -> String {
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String(format: "%.\(decimalPlaces)f", value)
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}
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func updateCurrentValue(newValue: Double) {
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if newValue < valueObserver.minimumValue {
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valueObserver.value = valueObserver.minimumValue
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}
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if newValue > valueObserver.maximumValue {
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valueObserver.value = valueObserver.maximumValue
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}
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delegate?.valueDidChange(newValue: valueObserver.value)
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}
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}
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extension Stepper {
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func getDeleteImage() -> Image {
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Image(uiImage: appearance.deleteImage ?? StepperControl.Appearance.defaultDeleteImage)
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}
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func getIncrementImage() -> Image {
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Image(uiImage: appearance.incrementImage ?? StepperControl.Appearance.defaultIncrementImage)
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}
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func getDecrementImage() -> Image {
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Image(uiImage: appearance.decrementImage ?? StepperControl.Appearance.defaultDecrementImage)
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}
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func getImageForDecrementButton() -> Image {
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if appearance.hasDeleteButton
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&& value <= stepValue
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&& minimumValue == 0 {
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return getDeleteImage()
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}
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return getDecrementImage()
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}
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}
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private extension Stepper {
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func onMinimumValueChange(newValue: Double) {
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if minimumValue < maximumValue {
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valueObserver.minimumValue = newValue
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if value < minimumValue {
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valueObserver.value = minimumValue
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}
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}
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}
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func onMaximumValueChange(newValue: Double) {
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if minimumValue < maximumValue {
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valueObserver.maximumValue = newValue
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}
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}
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func onValueChange(newValue: Double) {
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if (minimumValue...maximumValue).contains(newValue) {
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valueObserver.value = newValue
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}
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}
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}
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struct Stepper_Previews: PreviewProvider {
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static var previews: some View {
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HStack {
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Spacer().frame(maxWidth: .infinity)
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Stepper()
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Spacer().frame(maxWidth: .infinity)
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}
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}
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}

‎Sources/YStepper/UIKit/StepperControl+Appearance.swift‎

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//
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// StepperControl+Appearance.swift
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// YStepper
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//
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// Created by Sahil Saini on 06/03/23.
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// Copyright © 2023 Y Media Labs. All rights reserved.
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//
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import UIKit
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import YMatterType
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extension StepperControl {
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/// Appearance for stepper that contains typography and color properties
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public struct Appearance {
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/// Typography of stepper value label
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public var textStyle: (textColor: UIColor, typography: Typography)
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/// Background color for stepper view
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public var backgroundColor: UIColor
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/// Border color for stepper view
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public var borderColor: UIColor
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/// Border width for stepper view
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public var borderWidth: CGFloat
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/// Delete button image
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public var deleteImage: UIImage?
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/// Increment button image
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public var incrementImage: UIImage?
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/// Decrement button image
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public var decrementImage: UIImage?
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/// Whether to show delete button or not.
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var hasDeleteButton: Bool { deleteImage != nil }
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/// Initializer for appearance
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/// - Parameters:
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/// - textStyle: Typography and text color for valueText label.
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/// Default is `(UIColor.label, Typography.systemLabel)`
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/// - foregroundColor: Foreground color for valueText. Default is `.label`
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/// - backgroundColor: Background color for stepper view. Default is `.systemBackground`
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/// - borderColor: Border color for stepper view. Default is `UIColor.label`
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/// - borderWidth: Border width for day view. Default is `1.0`
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/// - deleteImage: Delete button image. Default is `Appearance.defaultDeleteImage`
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/// - incrementImage: Increment button image. Default is `Appearance.defaultIncrementImage`
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/// - decrementImage: Decrement button image. Default is `Appearance.defaultDecrementImage`
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public init(
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textStyle: (textColor: UIColor, typography: Typography) = (.label, .systemLabel),
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foregroundColor: UIColor = .label,
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backgroundColor: UIColor = .systemBackground,
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borderColor: UIColor = .label,
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borderWidth: CGFloat = 1.0,
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deleteImage: UIImage? = Appearance.defaultDeleteImage,
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incrementImage: UIImage? = Appearance.defaultIncrementImage,
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decrementImage: UIImage? = Appearance.defaultDecrementImage
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) {
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self.textStyle = textStyle
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self.backgroundColor = backgroundColor
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self.borderColor = borderColor
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self.borderWidth = borderWidth
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self.deleteImage = deleteImage
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self.incrementImage = incrementImage
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self.decrementImage = decrementImage
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}
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}
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}
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extension StepperControl.Appearance {
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/// Default stepper appearance
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public static let `default` = StepperControl.Appearance()
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/// Default image for delete button. Is a `trash.circle` from SF Symbols in template rendering mode
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public static let defaultDeleteImage = Images.delete.image
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/// Default image for increment button. Is a `plus.circle` from SF Symbols in template rendering mode
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public static let defaultIncrementImage = Images.increment.image
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/// Default image for decrement button. Is a `minus.circle` from SF Symbols in template rendering mode
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public static let defaultDecrementImage = Images.decrement.image
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}

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