I am a little confused as to the definition of classes as Models or Views in the Sketch example AppKit application (found at /Developer/Examples/AppKit/Sketch). The classes SKTRectangle, SKTCircle etc. are considered Model classes but they have drawing code. I am a little confused as to the definition of
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Sketch示例AppKit应用程序中的类如何分成模型/视图/控制器？
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