countForFetchRequest in Swift 2.0

Question

I am trying to use the countForFetchRequest method on a managed object context in Swift 2.0.

I note that the error handling for executeFetchRequest

Answer 1

You need to do like this:

let error = NSErrorPointer()
let fetchResults = coreDataStack.context.countForFetchRequest(fetchRequest, error: error)
print("Count \(fetchResults)")

This is the code for Swift 2.0

Answer 2

Your code is almost correct, but error needs to be a variable, in order to be passed as inout-argument with &:

var error: NSError? = nil
let count = managedObjectContext.countForFetchRequest(fetchRequest, error: &error)

Update: As of Swift 3, countForFetchRequest throws an error:

do {
    let count = try managedObjectContext.context.count(for:fetchRequest)
    return count
} catch let error as NSError {
    print("Error: \(error.localizedDescription)")
    return 0
}