Swift creating NSError Object

Question

I am trying to create an error object to display to the user.

let userInfo: [NSObject : AnyObject] =      [     "NSLocalizedDescriptionKey" :  NSLocalizedString("Unauthorized", comment: ""),     "NSLocalizedFailureReasonErrorKey" : NSLocalizedString("Unauthorized", comment: "")     ] let err = NSError(domain: "ShiploopHttpResponseErrorDomain", code: httpResponse.statusCode, userInfo: userInfo) print("Error in Post: \(err.localizedDescription)") 

Unfortunately the output is:

Error in Post: The operation couldn’t be completed.(ShiploopHttpResponseErrorDomain error 401.)  

I want to be able to show to the user that he should activate his account. Any ideas??

Answer 1

Looks like you want (see dictionary keys):

Swift 2

let userInfo: [NSObject : AnyObject] = [     NSLocalizedDescriptionKey :  NSLocalizedString("Unauthorized", value: "Please activate your account", comment: ""),     NSLocalizedFailureReasonErrorKey : NSLocalizedString("Unauthorized", value: "Account not activated", comment: "") ] 

Swift 3

let userInfo: [AnyHashable : Any] =             [                 NSLocalizedDescriptionKey :  NSLocalizedString("Unauthorized", value: "Please activate your account", comment: "") ,                 NSLocalizedFailureReasonErrorKey : NSLocalizedString("Unauthorized", value: "Account not activated", comment: "")         ] 

Then create the error object in both swift 2 or 3 like this:

let err = NSError(domain: "ShiploopHttpResponseErrorDomain", code: 401, userInfo: userInfo) println("Error in Post: \(err.localizedDescription)") 

NSLocalizedDescriptionKey and NSLocalizedFailureReasonErrorKey are global String variables, and the keys inside of the userInfo dictionary. The values are slightly different from what you specified:

println(NSLocalizedDescriptionKey) //prints "NSLocalizedDescription" println(NSLocalizedFailureReasonErrorKey) //prints "NSLocalizedFailureReason" 

I find it good practice to look at the documentation by right-clicking the class (NSError in this case) and selecting "Jump To Definition" within xcode. All kinds of questions can be answered this way. :)