我有一个包含多个属性的对象数组。以下是通过循环遍历对象数组获取的一些示例数据:
Name = Rent
Default Value 750
This Months Estimate = 750
Sum Of This Months Actuals = 0
Risk Factor = 0.0
Monthly Average = 750.0
--------------
Name = Bills
Default Value 250
This Months Estimate = 170
Sum Of This Months Actuals = 140
Risk Factor = 0.0
Monthly Average = 190.0
--------------
Name = Food
Default Value 240
This Months Estimate = 200
Sum Of This Months Actuals = 95
Risk Factor = 0.0
Monthly Average = 190.0
--------------
Name = Lunches
Default Value 100
This Months Estimate = 150
Sum Of This Months Actuals = 155
Risk Factor = 0.899999976158142
Monthly Average = 190.0
数据很少,所以我希望避免使用核心数据。我需要能够持久化保存数组,然后再次打开它并能够遍历它。我希望使用像NSUserDefaults或NSKeyedArchiver这样的简单解决方案,但在Swift中,我无法让它们与此类型的数组一起工作(我已经查阅了24小时的文档、论坛和在线示例...)
您建议我如何持久化保存上述对象数组?或者说,持久化保存这种类型的数组是不好的实践方式吗?
提前感谢您的帮助!
附上对象类:
class costCategory : NSObject {
var name : String
var defaultValue : Int
var thisMonthsEstimate : Int
var sumOfThisMonthsActuals : Int
var riskFactor : Float
var monthlyAverage : Float
init (name:String, defaultValue:Int, thisMonthsEstimate:Int, sumOfThisMonthsActuals:Int, riskFactor:Float, monthlyAverage:Float) {
self.name = name
self.defaultValue = defaultValue
self.thisMonthsEstimate = thisMonthsEstimate
self.sumOfThisMonthsActuals = sumOfThisMonthsActuals
self.riskFactor = riskFactor
self.monthlyAverage = monthlyAverage
}
}
如果我尝试将数组保存到NSUserDefaults中,我会遇到以下错误:
Property list invalid for format: 200 (property lists cannot contain objects of type 'CFType')
我尝试继承自NSCoder类,但是我遇到了一个无法解决的错误,如下所示:
class costCategory : NSObject, NSCoder {
var name : String
var defaultValue : Int
var thisMonthsEstimate : Int
var sumOfThisMonthsActuals : Int
var riskFactor : Float
var monthlyAverage : Float
init (name:String, defaultValue:Int, thisMonthsEstimate:Int, sumOfThisMonthsActuals:Int, riskFactor:Float, monthlyAverage:Float) {
self.name = name
self.defaultValue = defaultValue
self.thisMonthsEstimate = thisMonthsEstimate
self.sumOfThisMonthsActuals = sumOfThisMonthsActuals
self.riskFactor = riskFactor
self.monthlyAverage = monthlyAverage
}
// MARK: NSCoding
required convenience init(coder decoder: NSCoder) {
self.init() //Error here "missing argument for parameter name in call
self.name = decoder.decodeObjectForKey("name") as String
self.defaultValue = decoder.decodeIntegerForKey("defaultValue")
self.thisMonthsEstimate = decoder.decodeIntegerForKey("thisMonthsEstimate")
self.sumOfThisMonthsActuals = decoder.decodeIntegerForKey("sumOfThisMonthsActuals")
self.riskFactor = decoder.decodeFloatForKey("riskFactor")
self.monthlyAverage = decoder.decodeFloatForKey("monthlyAverage")
}
func encodeWithCoder(coder: NSCoder) {
coder.encodeObject(self.name, forKey: "name")
coder.encodeInt(Int32(self.defaultValue), forKey: "defaultValue")
coder.encodeInt(Int32(self.thisMonthsEstimate), forKey: "thisMonthsEstimate")
coder.encodeInt(Int32(self.sumOfThisMonthsActuals), forKey: "sumOfThisMonthsActuals")
coder.encodeFloat(self.riskFactor, forKey: "riskFactor")
coder.encodeFloat(self.monthlyAverage, forKey: "monthlyAverage")
}
}