Retrieving array of custom objects from UserDefaults using NSKeyedUnarchiever in swift

Asked Nov 19 '17 at 06:06

Active Nov 19 '17 at 06:41

Viewed 45 times

I have saved an array of custom objects that conforms to NSCoding protocol in UserDefaults using NSKeyedArchiver. But when I try to retrieve it using NSKeyedUnarchiver, i get runtime errors from Xcode. I have tried initialising NSArray using unarchived data but it also failed. My guess is that while unarchiving swift doesn't understand custom elements of this array. How shall I do it?

This is how I archived array of custom objects

static func saveCategoryList(_ categoryList : [Category]!) -> Void{
        let userDefaults = UserDefaults.standard
        let categoryListData = NSKeyedArchiver.archivedData(withRootObject: categoryList)
        userDefaults.set(categoryListData, forKey: Constants.CategoryList)
        userDefaults.synchronize()
    }

I get error like the attached screenshot in runtime. I am quite sure I am not doing it right. How can get my desired result?

edited Nov 19 '17 at 06:41

Rajamohan S

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asked Nov 19 '17 at 06:06

samin.yasar

2

What you have tried will be helpful for quick answer and Also need to describe error that your are got. – Rajamohan S Nov 19 '17 at 06:08
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Why are you creating NSArray there ? You have declared Array (swift array of Category) – Prashant Tukadiya Nov 19 '17 at 06:17
Check my answer here https://stackoverflow.com/a/46402965/4601900 – Prashant Tukadiya Nov 19 '17 at 06:18
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@JonSnow thanks a lot. It was a stupid thing to do. Going through learning curve of swift. :-) – samin.yasar Nov 19 '17 at 06:32
Good luck :) keep learning – Prashant Tukadiya Nov 19 '17 at 06:34
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`categoryList = userDefaults.data(forKey: Constants.CategoryList) as? [Category] ?? []` – Leo Dabus Nov 19 '17 at 07:32

Retrieving array of custom objects from UserDefaults using NSKeyedUnarchiever in swift

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