CODEWITHSUNDEEP
swiftcore-data
Sweeper
Sweeper

Reputation: 270733

Core Data generates an NSManagedObject subclass with a property of type NSNumber, but it's a Bool

I just created a Core Data data model and added some entities. Now I'm generating NSManagedObject subclasses.

In the generated code, I found that one of my properties, whose type is "Boolean" in the data model, has turned into a property of type NSNumber!

That's not correct, I thought. An NSNumber is certainly not a boolean. Why doesn't it just use the Bool type?

Then I thought that this might be another one of those annoying things of Objective-C. I think that just like Int and Double, a Bool cannot be saved into Core Data so it has to use an NSNumber. Am I right?

How to convert this NSNumber to a Bool and how to convert a Bool to an NSNumber? Maybe 0 = false and 1 = true? What about other values? This isn't type-safe at all...

Upvotes: 0

Views: 312

Answers (1)

Shankar BS
Shankar BS

Reputation: 8402

for your question How to convert this NSNumber to a Bool and how to convert a Bool to an NSNumber? u can do like below, for NSNumber objects

//convert bool to number 
NSNumber *boolInNumber = [NSNumber numberWithBool:YES]; //or NO

//get back, convert number to bool 
NSNumber *aNum = [NSNumber numberWithBool:YES]; //get the NSNumber instance
BOOL numberInBool = [aNum boolValue];

and aslo u can convert to other types, for more info check the class reference hear

sorry for the delay, and for swift version,

  var numInBool:NSNumber? //is a nsnumber instance
  numInBool = NSNumber(bool: true) //get number from bool (number in bool)

  var boolInNum:Bool? //it is boolean
  boolInNum = numInBool!.boolValue  //get bool from number (bool from number)

yes you are right... :) as per @fred doc said, 

let numInBool =     NSNumber(bool: true) 
let boolInNum =     numInBool.boolValue

Upvotes: 1

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