(Swift) Storing and retrieving Array to NSUserDefaults

Question

I am trying to store an array to NSUserDefaults and retrieve the array when needed to populate a UITableView.

Currently I am using:

//store data
NSUserDefaults.standardUserDefaults().setObject(myArray, forKey: "\(identity.text!)listA")                    
NSUserDefaults.standardUserDefaults().synchronize()

//retrieve data
let tabledata = NSUserDefaults.standardUserDefaults().stringForKey("\(identity.text!)listA")
myArray = [tabledata!]
tableView.reloadData()

But I get

fatal error: unexpectedly found nil while unwrapping an Optional value

when trying to load the data. I am not sure if the issue is in the storage or the retrieval. Has anyone been through this before?

Answer 1

From your code I see you are storing some array

// Your code
NSUserDefaults.standardUserDefaults().setObject(myArray, forKey: "\(identity.text!)listA")

and retrieving a string

//Your code
let tabledata = NSUserDefaults.standardUserDefaults().stringForKey("\(identity.text!)listA")

There is probably a type mismatch, You store one type and retrieve another type.

While retrieving either use arrayForKey() or objectForKey() see the code below.

let tabledata = NSUserDefaults.standardUserDefaults().arrayForKey("\(identity.text!)listA") 

or

let tabledata = NSUserDefaults.standardUserDefaults().objectForKey("\(identity.text!)listA")

If it is an array I would go with First one.