在NSUserDefaults中保存一个元组

Question

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)

现在我要保存它NSUserDefaults.

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.

Answer 1

我遇到了类似的场景,试图用一个元组编码NSCoder.我解决它的方法是手动将元组转换为a Dictionary.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)