(lldb) error when running on device but not simulator

Question

Click here to see the screenshot of the code.

I'm making a list application and I'm saving the array for the "list" that i wanna load when i open the app again. the weird thing is that i works on a simulator but not on a device. (See the screenshot to understand)

        feedCells = (NSUserDefaults.standardUserDefaults().objectForKey("feedCellsData") as? [String])!

thats the line that it keeps crashing on.

I've tried to change it so it's an optional value. But i can't find anything that seems to help..

Yash Vyas · Accepted Answer · 2016-06-08 11:29:58Z

1

First of all check that your device iOS version is iOS 8 or higher. If it is less than that then also use synchronize() after setting value to NSUserDefaults.

You are forcefully unwrapping (using !) an optional value which you are getting from Down Casting (using as?).

You can also resolve this crash by adding a check for the value which you are fetching from the NSUserDefaults for not nil and then assign it to your feedCells var.

let cells = NSUserDefaults.standardUserDefaults().objectForKey("feedCellsData") as? [String]
if cells != nil {
    feedCells = cells
}

or

Make feedCells var an optional and remove "!" from the end of the line which is getting the error.

var feedCell : [String]?
feedCells = NSUserDefaults.standardUserDefaults().objectForKey("feedCellsData") as? [String]

answered Jun 8, 2016 at 11:29

Yash Vyas

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2 Comments

Oscar Nilsson Over a year ago

This helped soooo much. There should be more people like you!

Yash Vyas Over a year ago

Accept & Up Vote the answer by clicking on the Right & Up Arrow button if it helped you.

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