swiftstringxcodecore-datauint64

How do you store an UInt64 in CoreData?

My understanding is that a UInt64 can be any value from: 0 to 18446744073709551615

I need to save a UInt64 identifier to CoreData, however the values I see are:

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I initially tried Integer 64 but now I am understanding that has a range of: -9223372036854775808 to 9223372036854775807

Do developers usually store an UInt64 as a String and do conversions between the two types? Is this the best practice?

Solution

  • You can (losslessly) convert between UInt64 and Int64:

    // Set:
obj.int64Property = Int64(bitPattern: uint64Value)

// Get:
let uint64Value = UInt64(bitPattern: obj.int64Property)

    You can define uint64Value as a computed property of the managed object class to automate the conversion:

    @objc(MyEntity)
public class MyEntity: NSManagedObject {
    
    public var uint64Property: UInt64 {
        get {
            return UInt64(bitPattern: int64Property)
        }
        set {
            int64Property = Int64(bitPattern: newValue)
        }
    }
}