Storing Int64 in UserDefaults

A user default object can only be an instance (or a combination ofinstances) of NSData, NSString, NSNumber, NSDate, NSArray, or NSDictionary.

Some Swift types are automatically bridged to Foundation types,e.g. Int, UInt, Float, Double and Bool are bridgedto NSNumber. So this could be saved in the user defaults:

var teamsData = Dictionary<String,Dictionary<String,Int>>()

On 64-bit architectures, Int is a 64-bit integer, but on32-bit architectures, Int is a 32-bit integer.

The fixed-sized integer types such as Int64 are notautomatically bridged to NSNumber. This was also observedin Swift - Cast Int64 to AnyObject for NSMutableArray.Therefore, to store 64-bit integers in the user defaults you haveto use NSNumber explicitly:

var teamsData = Dictionary<String,Dictionary<String,NSNumber>>()// Example how to add a 64-bit value:let value : UInt64 = 123teamsData["foo"] = ["bar" : NSNumber(unsignedLongLong: value)]

Martin's answer is no longer correct for Swift 3 since the set function is now type Any? instead of AnyObject?.

You can store an Int64 in UserDefaults like so:

import Foundationlet value: Int64 = 1000000000000000UserDefaults.standard.set(value, forKey: "key")if let value2 = UserDefaults.standard.object(forKey: "key") as? Int64 {    // value2 is an Int64 with a value of 1000000000000000    print(value2)}

You can paste the above code into a Swift playground and try yourself.

Swift 4:

You can save int64 as string in UserDefaults

let value: Int64 = 1000000000000000let stringValue = String(value)UserDefaults.standard.set(stringValue, forKey: "int64String")

Like that you avoid Int truncation.

And then you can recover the original value:

let int64String = UserDefaults.standard.string(forKey: "int64String")let originalValue = Int64(int64String!)

This allow you to compare it with other int64 values