Get error `NSUbiquitousKeyValueStore` this class is not key value coding-compliant for the key

Question

I'm trying to use iCloud key-value using NSUbiquitousKeyValueStore class. But when I try to get value by specified key, I get an error

[<NSUbiquitousKeyValueStore 0x6000002983d0> valueForUndefinedKey:]: this class is not key value coding-compliant for the key "some_key"

How can I solve this?

Answer 1

Use:

NSUbiquitousKeyValueStore.default.set(yourValue, forKey: "your.key")

instead of

NSUbiquitousKeyValueStore.default.setValue(yourValue, forKey: "your.key")

Answer 2

It's possible you're getting this error if the value you're trying to store is not exposed to the objective-c runtime (like an optional value type for instance). Try converting your Int/Double/etc to a non-optional NSNumber and then retrieving it via object(forKey:) instead.