設計模式-觀察者

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Don Chen

觀察者模式（Observer Pattern）練習題目

Software

設計模式
是對軟體設計中普遍存在（反覆出現）的各
種問題，所提出的解決方案 – wikipedia
Don Chen
ios.devdon.com

今日特色
法國麵包01
奶油酥餅02
草莓大福03
Wood
Bakery
大餅油條04

今日特色通知系統
一套可以提供給Wood Bakery用來通知單位今日特色的系統
負責通知所有單位
今日特色
收到通知
Print出今日特色
收到通知
Print出今日特色
收到通知
Print出今日特色
WoodBakery WoodHospital WoodSchool WoodFireStation

今日特色通知系統
一套可以提供給Wood Bakery用來通知單位今日特色的系統

發現的問題
「主題」必須要知道「訂閱者」接收通知的方法才能進行通知
每當有人「訂閱」或「取消訂閱」都會需要修改「主題」的Source Code

觀察者模式（Observer
Pattern）
觀察者模式定義了一種一對多的依賴關係，讓一個或多個觀察對象監聽其所關心的主題對象。
當這個主題對象在自身發生變化的時候，會給所有的觀察者對象發送通知。使用觀察者模式
可以讓大量多組對象在較少依賴的情況下實現合作，因此這個模式被廣泛應用。

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