81 lines
2.2 KiB
Swift
81 lines
2.2 KiB
Swift
//
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// Reactive.swift
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// RxSwift
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//
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// Created by Yury Korolev on 5/2/16.
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// Copyright © 2016 Krunoslav Zaher. All rights reserved.
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//
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/**
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Use `Reactive` proxy as customization point for constrained protocol extensions.
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General pattern would be:
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// 1. Extend Reactive protocol with constrain on Base
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// Read as: Reactive Extension where Base is a SomeType
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extension Reactive where Base: SomeType {
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// 2. Put any specific reactive extension for SomeType here
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}
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With this approach we can have more specialized methods and properties using
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`Base` and not just specialized on common base type.
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`Binder`s are also automatically synthesized using `@dynamicMemberLookup` for writable reference properties of the reactive base.
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*/
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@dynamicMemberLookup
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public struct Reactive<Base> {
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/// Base object to extend.
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public let base: Base
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/// Creates extensions with base object.
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///
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/// - parameter base: Base object.
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public init(_ base: Base) {
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self.base = base
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}
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/// Automatically synthesized binder for a key path between the reactive
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/// base and one of its properties
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public subscript<Property>(dynamicMember keyPath: ReferenceWritableKeyPath<Base, Property>) -> Binder<Property> where Base: AnyObject {
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Binder(self.base) { base, value in
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base[keyPath: keyPath] = value
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}
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}
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}
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/// A type that has reactive extensions.
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public protocol ReactiveCompatible {
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/// Extended type
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associatedtype ReactiveBase
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/// Reactive extensions.
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static var rx: Reactive<ReactiveBase>.Type { get set }
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/// Reactive extensions.
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var rx: Reactive<ReactiveBase> { get set }
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}
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extension ReactiveCompatible {
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/// Reactive extensions.
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public static var rx: Reactive<Self>.Type {
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get { Reactive<Self>.self }
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// this enables using Reactive to "mutate" base type
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// swiftlint:disable:next unused_setter_value
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set { }
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}
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/// Reactive extensions.
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public var rx: Reactive<Self> {
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get { Reactive(self) }
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// this enables using Reactive to "mutate" base object
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// swiftlint:disable:next unused_setter_value
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set { }
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}
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}
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import Foundation
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/// Extend NSObject with `rx` proxy.
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extension NSObject: ReactiveCompatible { }
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