Delegation in Objective-C

1)Delegation in Objective-C
http://blog.eddie.com.tw/2013/05/24/delegation-in-objective-c/
2)Delegation
https://developer.apple.com/library/ios/documentation/General/Conceptual/DevPedia-CocoaCore/Delegation.html
3) IOS – 什麼是協定(PROTOCOL)與委派(DELEGATE)?
http://www.takobear.tw/2014/01/12/ios-protocoldelegate/
4) BEAR實驗室: XCODE製作互動元件 – UIBUTTON
http://www.takobear.tw/2014/01/12/bear-xcode-uibutton/
5)[Don IOS筆記] 研究delegate和protocol
http://blog.devdon.com/?p=2530
6)ios delegate你必須知道的事情
http://popcornylu.blogspot.tw/2011/07/delegate.html 
7)Developer's Note_ Protocol & Delegate
http://iosdevelopersnote.blogspot.tw/2010/11/protocol-delegate.html