iOS > Objective-c > Tutorials
http://cocoadevcentral.com/d/learn_objectivec/ http://www.otierney.net/objective-c.html.zh-tw.big5
iOS, Android, Unity3D Education blog,
http://cocoadevcentral.com/d/learn_objectivec/ http://www.otierney.net/objective-c.html.zh-tw.big5