[iOS] Delegate 與 Datasource
剛開始學寫iOS時一定得弄清楚什麼是delegate什麼是datasource，爬了前人研究的結論，其實兩者是一樣的機制，只是前者處理介面，而後者處理資料。
接下來就是探討何謂代理(delegatation)？舉個例子就很容易瞭解，當使用者點選視窗中的確定或取消的按鈕，會由代理者(delegater)來負責回應下一步的動作。
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