Enum case switch not found in type

问题:

Can someone please help me with this.

I have the following public enum

public enum OfferViewRow {     case Candidates     case Expiration     case Description     case Timing     case Money     case Payment  } 

And the following mutableProperty:

private let rows = MutableProperty<[OfferViewRow]>([OfferViewRow]()) 

In my init file I use some reactiveCocoa to set my MutableProperty:

rows <~ application.producer     .map { response in         if response?.application.status == .Applied {             return [.Candidates, .Description, .Timing, .Money, .Payment]         } else {             return [.Candidates, .Expiration, .Description, .Timing, .Money, .Payment]         } } 

But now the problem, when I try to get the value of my enum inside my rows it throws errors. Please look at the code below.

 func cellViewModelForRowAtIndexPath(indexPath: NSIndexPath) -> ViewModel {         guard             let row = rows.value[indexPath.row],             let response = self.application.value             else {                 fatalError("")         }          switch row {         case .Candidates:              // Do something         case .Expiration:             // Do something         case .Description:            // Do something         case .Timing:            // Do something         case .Money:            // Do something         case .Payment:            // Do something         }     } 

It throws an error: Enum case 'some' not found in type 'OfferViewRow on the line let row = rows.value[indexPath.row]

And on every switch statements it throws: Enum case 'Candidates' not found in type '<<Error type>>

Can someone help me with this?

回答1:

The guard statement wants an optional, as hinted by "Enum case 'some'" in the error message.

But rows.value[indexPath.row] is not Optional<OfferViewRow>, it is a raw OfferViewRow. So it won't enter a guard statement.

Move let row = rows.value[indexPath.row] one line up: Swift takes care of bounds checking, and will crash if indexPath.row is out of bounds.

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