深入浅出Apple响应式框架Combine

{"type":"doc","content":[{"type":"heading","attrs":{"align":null,"level":2},"content":[{"type":"text","text":"一、引言"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"Combine.framework 是Apple在2019 WWDC 上基于Swift推出的函数响应框架（Functional Reactive Programming）,支持Apple全平台的操作系统（iOS13+，macOS 10.15+等）。函数式响应框架无论在哪个平台早已流行泛滥，开源的"},{"type":"link","attrs":{"href":"http:\/\/reactivex.io\/","title":"","type":null},"content":[{"type":"text","text":"Rx"}]},{"type":"text","text":"更是实现了各种语言的响应式编程框架。Apple在这个时候推出响应式框架，无疑是对自己护城河的进一步巩固。事实上SwiftUI的数据驱动就是依赖Combine。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"本文将深入浅出地介绍Combine的基本概念和原理，然后通过具体demo详细阐述其在实际编码中的应用。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":2},"content":[{"type":"text","text":"二、什么是Combine"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"blockquote","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"Combine is Swift declarative framework for processing values over time"}]}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"Combine 为处理随着时间变化的值的一种声明式框架。Combine 作用是将异步事件通过组合事件处理操作符进行自定义处理。关注如何处理变化的值，正是响应式编程的核心。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"Combine可以概述为一种声明式的函数响应式编程，简洁用下图表示："}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https:\/\/static001.infoq.cn\/resource\/image\/f3\/33\/f3cf70f3fe6ea57a01c8316d8c7fe433.png","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":false}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"通过此图，我们可以总结Combine是什么："}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"Combine = Publishers + Operators + Subscribers"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":"2.1 Publishers"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"blockquote","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"Publisher sends sequences of values over time to one or more Subscribers."}]}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}}]}