ios – 在NSUserDefaults中保存一个元组

我正在使用一个元组来存储这样的东西.

var accessLavels: (hasInventoryAccess: Bool,hasPayrolAccess: Bool)
accessLavels = (hasInventoryAccess: true,hasPayrolAccess: false)

现在我想将它保存在NSUserDefaults中.

NSUserDefaults.standardUserDefaults().setValue(accessLavels,forKey: "AccessLevelKey")
NSUserDefaults.standardUserDefaults().synchronize()

但是我收到以下错误.

类型'(hasInventoryAccess：Bool,hasPayrolAccess：Bool)’不符合协议’AnyObject’

我该如何解决这个问题？如果它不可能,那么欢迎任何其他保存元组的建议.

谢谢.

解决方法

我遇到了一个尝试用NSCoder编码元组的类似场景.我解决它的方法是手动将元组转换为字典.这不是一个很好的解决方案,因为如果元组发生变化,需要在几个地方更改密钥.

我的元组中有一个嵌套的枚举,并给它一个基本类型(String),我从中转换了原始值.这是一个额外的工作,但幸运的是你的只是原始人.

# SerializeableTuple.swift

typealias Accesstuple = (hasInventoryAccess: Bool,hasPayrolAccess: Bool)
typealias AccessDictionary = [String: Bool]

let InventoryKey = "hasInventoryAccess"
let PayrollKey = "hasPayrollAccess"

func serializeTuple(tuple: Accesstuple) -> AccessDictionary {
    return [
        InventoryKey : tuple.hasInventoryAccess,PayrollKey : tuple.hasPayrolAccess
    ]
}

func deserializeDictionary(dictionary: AccessDictionary) -> Accesstuple {
    return Accesstuple(
        dictionary[InventoryKey] as Bool!,dictionary[PayrollKey] as Bool!
    )
}

# Encoding / Decoding

var accessLavels: Accesstuple = (hasInventoryAccess: true,hasPayrolAccess: false)

// Writing to defaults
let accessLevelDictionary = serializeTuple(accessLavels)
NSUserDefaults.standardUserDefaults().setobject(accessLevelDictionary,forKey: "AccessLevelKey")

// Reading from defaults
let accessDic = NSUserDefaults.standardUserDefaults().dictionaryForKey("AccessLevelKey") as AccessDictionary
let accessLev = deserializeDictionary(accessDic)