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)
现在我要保存它在 NSUserDefaults的
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'
如何解决此问题?如果它不可能,那么欢迎保存元组的任何其他建议。
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
我遇到了类似的场景,尝试使用 NSCoder
对元组进行编码。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。
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。
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!
)
}
# 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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