[转]Swift中实现Observable机制

猴子原创，欢迎转载。转载请注明： 转载自Cocos2Der-优快云，谢谢！ 
原文地址: http://blog.youkuaiyun.com/cocos2der/article/details/51917539

今天给别人讲个Observable的实现和使用场景，结合Observable-Swift github: https://github.com/slazyk/Observable-Swift 讲了半天貌似还没有特别明白，故写了个简易的实现，讲述了下Observable属性监控机制。

//: Playground - noun: a place where people can play

import UIKit
import Foundation

// MARK: - Observable
class Observable<T> { // 定义block结构 typealias Observer = T -> Void // 申明一个block，用于数据改变的执行 private var observer: Observer? // 数据发生变更，则通过observer告知 var value: T { didSet { observer?(value) } } init(_ v: T) { value = v } func observe(observer: Observer?) { self.observer = observer observer?(value) } } // MARK: - People struct PeopleModel { let firstName: Observable<String> let lastName: Observable<String> init(firstName: String, lastName: String) { self.firstName = Observable(firstName) self.lastName = Observable(lastName) } } // MARK: - Test // test1 let people = PeopleModel(firstName: "sunny", lastName: "liu") people.firstName.observe { newValue in print("firstName changed: \(newValue)") } people.lastName.observe { print("lastName changed: \($0)") } people.firstName.value = "sunny2" people.lastName.value = "liu2" // test2 class House { let lableHouseName = UILabel() init() { } var people: PeopleModel? { didSet { people?.firstName.observe{ [unowned self] in self.lableHouseName.text = $0 } } } }

 

这样貌似容易理解了，O(∩_∩)O哈哈~

转载于:https://www.cnblogs.com/linganxiong/p/5896996.html