Use of unresolved identifier 'objects' - xcode

Question

How to define objects in the code and of which type?
override func viewDidLoad() {
super.viewDidLoad()
let appDelegate=UIApplication.sharedApplication().delegate as! AppDelegate
let context=appDelegate.managedObjectContext
let request=NSFetchRequest(entityName:lineEntityName)
do{
let objects = try context.executeFetchRequest(request)
}
catch let error as NSError {
print(error)
}
if let objectList=objects
{
for oneObject in objectList
{
let lineNum=oneObject.valueForKey(lineNumberKey) as integerValue
let lineText=oneObject.valueForKey(lineTextKey) as String
let lineField=lineFields(lineNum)
textField.text=lineText
}
}
else
{
print("There was an Error")
}
let app=UIApplication.sharedApplication()
NSNotificationCenter.defaultCenter().addObserver(self, selector:"applicationWillResignActiveNotification", name: UIApplicationWillResignActiveNotification, object: app)
// Do any additional setup after loading the view, typically from a nib.
}

Answer 1

The recommended way is to put all good code in the do clause which solves the problem.
And executeFetchRequest returns a non-optional array so the optional binding can be omitted.
override func viewDidLoad() {
super.viewDidLoad()
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let context = appDelegate.managedObjectContext
let request = NSFetchRequest(entityName:lineEntityName)
do {
let objects = try context.executeFetchRequest(request)
for oneObject in objects
{
let lineNum = oneObject.valueForKey(lineNumberKey) as integerValue
let lineText = oneObject.valueForKey(lineTextKey) as String
let lineField = lineFields(lineNum)
textField.text = lineText
}
let app = UIApplication.sharedApplication()
NSNotificationCenter.defaultCenter().addObserver(self, selector:"applicationWillResignActiveNotification", name: UIApplicationWillResignActiveNotification, object: app)
// Do any additional setup after loading the view, typically from a nib.
}
catch let error as NSError {
print(error)
}
}