Using OptionSet to simplify your view state. Unify your states into 1

OptionSetSwiftUI.swift

//
//  Created by Daniel Tavares on 07/05/2021.
//

import SwiftUI

// MARK: - OptionsSet
// Blog post https://dev.to/vibrazy/easy-swiftui-view-bindings-using-optionset-and-sourcery-4edb

protocol OptionsBinding {}

enum MyEnum: OptionsBinding {
	case showBackground
	case showBorder
	case reduceMotionEnabled
	case largeFont
	case receiveEmailNotifications
}

extension MyEnum {
	struct Options: OptionSet {
		var rawValue: UInt
		static let none = Self([])
		static let showBackground = Self(rawValue: 1 << 0)
		static let showBorder = Self(rawValue: 1 << 1)
		static let reduceMotionEnabled = Self(rawValue: 1 << 2)
		static let largeFont = Self(rawValue: 1 << 3)
		static let receiveEmailNotifications = Self(rawValue: 1 << 4)
	}
}

extension Binding where Value: OptionSet, Value == Value.Element {
	func bindedValue(_ options: Value) -> Bool {
		return wrappedValue.contains(options)
	}

	func bind(
		_ options: Value,
		animate: Bool = false
	) -> Binding<Bool> {
		return .init { () -> Bool in
			self.wrappedValue.contains(options)
		} set: { newValue in
			let body = {
				if newValue {
					self.wrappedValue.insert(options)
				} else {
					self.wrappedValue.remove(options)
				}
			}
			guard animate else {
				body()
				return
			}
			withAnimation {
				body()
			}
		}
	}
}

struct LessStateVariablesView: View {
	@State var viewOptions = MyEnum.Options.none

	var body: some View {
		ZStack {
			if $viewOptions.bindedValue(.showBackground) {
				Color.red.edgesIgnoringSafeArea(.all)
			}
			VStack {
				Toggle(isOn: $viewOptions.bind(.showBackground)) {
					Text(LocalizedStringKey("Show Background"))
				}
				Toggle(isOn: $viewOptions.bind(.showBorder)) {
					Text(LocalizedStringKey("Show Border"))
				}
				Toggle(isOn: $viewOptions.bind(.reduceMotionEnabled)) {
					Text(LocalizedStringKey("Reduce Motion Enabled"))
				}
				Toggle(isOn: $viewOptions.bind(.largeFont)) {
					Text(LocalizedStringKey("Large Font"))
				}
				Toggle(isOn: $viewOptions.bind(.receiveEmailNotifications)) {
					Text(LocalizedStringKey("Receive Notifications"))
				}
			}
			.padding()
			.font(.system(size: 22, weight: .light, design: .rounded))
		}
	}
}

/*
https://github.com/krzysztofzablocki/Sourcery

Stencil Template
{% for type in types.enums where type.cases.count > 0 and type.based.OptionsBinding or type|annotated:"OptionsBinding" %}
extension {{ type.name }} {
	struct Options: OptionSet {
		var rawValue: UInt
		static let none = Self([])
		{% for i in 0...type.cases.count %}
			{% if not forloop.last %}
		static let {{type.cases[i].name}} = Self(rawValue: 1 << {{i}})
	  {% endif %}
	{% endfor %}
	}
}
{% endfor %}

extension Binding where Value: OptionSet, Value == Value.Element {
	func bindValue(_ options: Value) -> Bool {
		return wrappedValue.contains(options)
	}

	func bind(
		_ options: Value,
		animate: Bool = false
	) -> Binding<Bool> {
		return .init { () -> Bool in
			self.wrappedValue.contains(options)
		} set: { newValue in
			let body = {
				if newValue {
					self.wrappedValue.insert(options)
				} else {
					self.wrappedValue.remove(options)
				}
			}
			guard animate else {
				body()
				return
			}
			withAnimation {
				body()
			}
		}
	}
}
*/

Hi @vibrazy,

This would be very helpful for an app I'm working on -- would you be wiling to add a license so I can safely reuse it?

Thanks,

Julie