Called to inform the adapter that the host widget has been shown or hidden. 
      Syntax
         
         
            - 
            (
            void
            ) 
            
               model
            
            : 
            (
            id< SMPOpenUIFieldModel >
            ) 
            model 
            
               didSetVisible
            
            : 
            (
            BOOL
            ) 
            visible
         
      
      Parameters
         
         
            - 
               model – 
               the model
            
 
            - 
               visible – 
               YES to indicate it is visible, NO to indicate it is hidden
            
 
         
       
      Remarks
         
         The UIView for the extension will be show or hidden automatically. Optional.