在 NSUserDefaults 中保存一个元组 [英] Save a tuple in NSUserDefaults

问题描述

我正在使用一个元组来存储这样的东西.

I'm using a tuple to store something like this.

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

现在我想将它保存在 NSUserDefaults 中.

Now I want to save it in NSUserDefaults.

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

但我收到以下错误.

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

我该如何解决这个问题?如果不可能，那么欢迎任何其他保存元组的建议.

How can I resolve this issue? If its impossible, then any other suggestions to save a tuple is welcome.

谢谢.

推荐答案

我在尝试使用 NSCoder 对元组进行编码时遇到了类似的情况.我解决它的方法是将元组手动转换为 Dictionary.这不是一个很好的解决方案，因为如果元组发生更改，则需要在多个位置更改键.

I encountered a similar scenario trying to encode a tuple with NSCoder. The way I am solving it is by manually converting the tuple to a Dictionary. This is not a great solution as the keys need to be changed in several places if the tuple ever changes.

我的元组中有一个嵌套枚举，并给了它一个基本类型(字符串)，我从中转换了原始值.这是一些额外的工作，但谢天谢地，你的只是原语.

I had a nested enum in my tuple and gave it a base type (String) from which I converted the raw value. It was a little extra work but thankfully yours is only primitives.

# 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!
    )
}

<小时>

# 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)

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