Swift Gives error Thread 1: EXC_BAD_ACCESS(code=1, address=0x0) when accessing NSManagedObject's property

问题

My function to create NSManagedObject's subclass object is;

func loginMoldelWithName(name: NSString, atIndexPath indexPath: NSIndexPath) -> LoginModel {

    let entity = NSEntityDescription.entityForName("LoginModel", inManagedObjectContext: managedObjectContext!)

    var login = LoginModel(entity: entity!, insertIntoManagedObjectContext: managedObjectContext)

    login.name = name
    login.date = NSDate()
    login.rowIndex = indexPath.row as NSNumber

    var error: NSError?
    if !managedObjectContext!.save(&error) {
        println("\(TAG) Could not save \(error), \(error?.userInfo)")
    }

    return login as LoginModel

}

And the one to delete;

func deleteLoginModel(loginModel: LoginModel) {
    println("\(TAG)  \(loginModel.name)")
    managedObjectContext?.deleteObject(loginModel)

    var error : NSError?
    if(managedObjectContext!.save(&error) ) {
        println("\(TAG) \(error?.localizedDescription)")
    }
}

And where the issue occurs is at;

let loginModel = loginModels[indexPath.row] as LoginModel
println("\(TAG) \(loginModel.name)")
// remove from Core Data
deleteLoginModel(loginModel)
...

After removing loginModel object when i try to access the loginModel.name, i'm getting the error "Thread 1: EXC_BAD_ACCESS(code=1, address=0x0)"

Invalid expression is written for loginModel in the variables view, see the snaphsot below...

I can't find where i did wrong and what could have happened to the loginModel instance ?

回答1:

From the screenshot you attached, it looks like the error is occurring because you are trying to access the property of an object after that object has been deleted. At that point, the properties of the object will no longer be valid memory addresses.

来源：https://stackoverflow.com/questions/28092971/swift-gives-error-thread-1-exc-bad-accesscode-1-address-0x0-when-accessing-n

标签

swift

core-data

exc-bad-access