Using Portable Class Libraries in iOS and Android-Apps http://visualstudiomagazine.com/Articles/2014/02/01/Using-Portable-Class-Libraries-in-iOS-and-Android-Apps.aspx?Page=1
設計報價 http://home.gamer.com.tw/creationDetail.php?sn=2350909&fb_action_ids=10152175807728548&fb_action_types=og.likes&fb_source=other_multiline&action_object_map=%5B635143679867303%5D&action_type_map=%5B%22og.likes%22%5D&action_ref_map=%5B%5D
了解 Objective-C 上的 KVO(Key-Value Observing) 機制 http://blog.riaproject.com/objective-c/2147/%E4%BA%86%E8%A7%A3-objective-c-%E4%B8%8A%E7%9A%84-kvokey-value-observing-%E6%A9%9F%E5%88%B6.html