anchor.diff:  
   // display duration and position
   let toastDefaultPosition = "bottom"
  -let int toastDefaultDuration  = 3.0f
  +let toastDefaultDuration  = 3.0
   
   // image view size
   let toastImageViewWidth = 80.0f
  
positive.code: //    }
  //    
  //    UIActivityIndicatorView *activityIndicatorView <- [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]
  //    activityIndicatorView.center <- CGPointMake(activityView.bounds.size.width / 2, activityView.bounds.size.height / 2)
  //    [activityView addSubview:activityIndicatorView]
  //    [activityIndicatorView startAnimating]
  //    
  
negative.code: //    UIView *activityView <- [[UIView alloc] initWithFrame:new RectangleF(0, 0, toastActivityWidth, toastActivityHeight)]
  //    activityView.center <- [self centerPointForPosition:position withToast:activityView]
  //    activityView.backgroundColor <- [[UIColor blackColor] colorWithAlphaComponent:toastOpacity]
  //    activityView.Alpha <- 0.0f
  //    activityView.autoresizingMask <- (UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin)
  //    activityView.layer.cornerRadius <- toastCornerRadius
  //    
  