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iOS

Posted by Dion Wu
Dion Wu
2,570 Points

Swift : Entity Attribute is not incrementing after 1st tap

http://stackoverflow.com/questions/31821015/making-a-counter-app-do-i-have-to-do-something-after-saving-to-core-data

Hi all,

I'm making a cookie-clicker clone and building out the basics of it right now. I have an IBAction in my View Controller that basically increments an attribute "Points" in my data model entity "Score" every time you tap an image.

However, what is happening is that the Points.score only increments after the 1st tap, and then it stays the same for every tap afterwards. I'm pretty sure I'm supposed to be doing something after I call the managedObjectContext.save() function, but I don't know what.

The code is below.

@IBAction func tapHomeImage(sender: AnyObject) {
    //Score is the name of my Entity, with "points" being an attribute
    let entity = NSEntityDescription.entityForName("Score", inManagedObjectContext: managedObjectContext!)
    let score = Score(entity: entity!, insertIntoManagedObjectContext: managedObjectContext!)

    // **As an aside question, is there a more efficient way to code the below? The issue I have is that score.points is of type NSNumber
    let intScore = score.points as Int
    let incrementedIntScore = intScore + 1
    score.points = NSNumber(integer: incrementedIntScore)

    var error: NSError?
    managedObjectContext?.save(&error)

    //homeScoreLabel is an IBOutlet for the Score displayed on the page
    homeScoreLabel?.text = "\(score.points)"
}