objective c - iOS Refactoring/design: One view controller to manage different models/streams? -

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i'm working on app have different types of "streams" (think twitter). in have - pretty big - view controller manages of this. stream consists of 2 main entities - user , post - in different formats. in view controller have nsstring property determine kind of stream is. leads lot of this:

if ([self.posttype isequaltostring:@"stream"]) {      // stuff  } else if [self.posttype  ... [...] [...]

i don't know if best solution design wise, , leads lot of coupling. thing avoid lot of duplication. there better/nicer way same thing?

typedef enum{     stream,     --,     -- }posttype;

better use this..

  switch (_posttype)      {         case stream:             //do want             break;         case --:             break;          case --:             break;     }

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