CODEWITHSUNDEEP
iosswiftnsuserdefaults
Khoury
Khoury

Reputation: 431

How to save variable to NSUserdefaults without fatal error

I am trying to save some variable to NSUserDefaults when tapping on a UICollectionView cell, but I get the following error.

fatal error: unexpectedly found nil while unwrapping an Optional value

Here is the code I am using when a cell is tapped.

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    // handle tap events
    let text = Globals.sinceLabelArray[indexPath.item]
    userDefaults.setObject(text, forKey: "sinceText")

    let image = String(Globals.imagesArray[indexPath.item])
    userDefaults.setObject(image, forKey: "khoury")

    let dateFormatter = NSDateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
    let daydate = Globals.datesArray[indexPath.item] as String
    userDefaults.setObject(daydate, forKey: "day")
    performSegueWithIdentifier("menutohome", sender: nil)
}

Here is the view it impacts, and how.

let day = userDefault.objectForKey("day") as? NSDate
        let date1 = day
        let date2 = NSDate()
        let diffDateComponents = NSCalendar.currentCalendar().components([NSCalendarUnit.Day, NSCalendarUnit.Hour, NSCalendarUnit.Minute, NSCalendarUnit.Second], fromDate: date1!, toDate: date2, options: NSCalendarOptions.init(rawValue: 0))

Thanks

Upvotes: 1

Views: 204

Answers (2)

Syed M
Syed M

Reputation: 81

I think you're setting dayDate as String

let daydate = Globals.datesArray[indexPath.item] as String // <- String
userDefaults.setObject(daydate, forKey: "day")

While when you called it back as NSDate

let day = userDefault.objectForKey("day") as? NSDate // <- NSDate

UPDATE:

You can save the dateObject as String first into NSUserDefaults. Once you want to use it, then use dateFormatter to make it as NSDate.

Example:

When you call it back from NSUserDefaults

        let day = userDefault.objectForKey("day") as? String
        let dateFormatter = NSDateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss" // this format must equal to what it returns from the server

        let dayDate: NSDate = dateFormatter.dateFromString(day)
        print(dayDate) // your NSDate

Upvotes: 1

Idan
Idan

Reputation: 5450

If you are not sure if a variable is nil or not try and use conditional statement before using it for example:

Instead of: 

let text = Globals.sinceLabelArray[indexPath.item]
userDefaults.setObject(text, forKey: "sinceText")

use: 

if let text = Globals.sinceLabelArray[indexPath.item] {
   userDefaults.setObject(text, forKey: "sinceText")
 } else {
   print("error has happened here")
 }

Upvotes: 1

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