ios - How to cast controller to a specific protocol instead of a class in Swift? -


this protocol:

protocol dbviewanimationtransitioning {     var viewforanimation: uiview? { set } }

example of usage inside prepareforsegue::

override func prepareforsegue(segue: uistoryboardsegue, sender: anyobject?) {     if let controller = segue.destinationviewcontroller as? dbviewanimationtransitioning {         controller.viewforanimation = sender as? uiview //cannot assign to viewforanimation in controller     } }

everything fine when cast specific controller f.e. dbfindviewcontroller. need cast specific protocol not class. how accomplish this?

because protocol isn't class/struct cannot assign because may struct make no sense because copied. try making class protocol declaring protocol dbviewanimationtransitioning : class


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