if your app use this solution , do do you plan port the app to other platform ? for example, iPhone app –> Android or Backberry.
I do not want user it , but some code is exist …
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Any Cocoa code is not going to be easily portable to Android or Blackberry, regardless of whether or not you use KVC or KVO, since Objective-C doesn’t exist on those platforms. If you want a cross-platform app, your best bet is to write basic underlying code (such as data models) in C or C++ and write the GUI in Cocoa.