CODEWITHSUNDEEP
swiftcore-data
Matthew Walker
Matthew Walker

Reputation: 15

Swift Core Data Variable Issue

I am having a syntax issues I just cannot figure out. I do not have a strong Swift back ground, so the answer my be easy (I hope.) So, here is the snippet:

public func getLatestDate()-> NSDate? {

    var request = NSFetchRequest()
    var entity = NSEntityDescription.entityForName("Event", inManagedObjectContext: self.managedObjectContext)

    request.entity = entity

    let sortDescriptor = NSSortDescriptor(key: "timeStamp", ascending: false)
    let sortDescriptors = [sortDescriptor]

    request.sortDescriptors = sortDescriptors

    var error: NSError? = nil

    do {
        let results = try self.managedObjectContext.executeFetchRequest(request)
    } catch {
        fatalError("Failed to fetch employees: \(error)")
    }

    var date: NSDate?
    if results != nil {
        let managedObject: NSManagedObject = results![0] as NSManagedObject
        date = managedObject.valueForKey("timeStamp") as? NSDate
    }

    return date
}

The problem is that if results != nil and the results on the following line are throwing an error stating:

Use of unresolved identifier 'results'

How do I resolve this issue?

Thank you.

-Matt

Upvotes: 0

Views: 30

Answers (2)

Ulli H
Ulli H

Reputation: 1888

in addition to Gavin: this will work cause of the reason, thar Gavin mentioned

do {
    let results = try self.managedObjectContext.executeFetchRequest(request) 
    if results != nil {
        let managedObject: NSManagedObject = results![0] as NSManagedObject
        date = managedObject.valueForKey("timeStamp") as? NSDate
    }

} catch {
    fatalError("Failed to fetch employees: \(error)")
}

Upvotes: 0

Gavin
Gavin

Reputation: 8200

You're declaring results here:

do {
    let results = try self.managedObjectContext.executeFetchRequest(request)
} catch {
    fatalError("Failed to fetch employees: \(error)")
}

So you can see that it's being done within a do-catch block. That means that where you try to use it is out of the scope where it was defined, so it can't see it at all. By the time you get to if results != nil, it's already gone out of scope and is gone.

Upvotes: 1

Related Questions