如何将快速结构保存到文件 [英] How to save a swift struct to file
本文介绍了如何将快速结构保存到文件的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想对我的应用程序的(非常简单的)模型使用结构.
I want to use structs for the (very simple) model of my app.
但是NSKeyedArchiver
仅接受对象(扩展NSObjects
).
However NSKeyedArchiver
only accepts objects (extending NSObjects
).
是否有将结构保存到文件的好方法?
Is there any good way to save a struct to a file?
推荐答案
我有时使用的一种非常简单的方法.在类/NSCoding场景中,您需要编写的代码量不再多了.
A very simple approach I used sometimes. The quantity of code you need to write is no more then in the class/NSCoding scenario.
首先导入出色的 SwiftyJSON 库.
struct Starship {
let name: String
let warpSpeed: Bool
let captain: String?
init(name: String, warpSpeed: Bool, captain: String? = nil) {
self.name = name
self.warpSpeed = warpSpeed
self.captain = captain
}
}
让它可与JSON相互转换
struct Starship {
let name: String
let warpSpeed: Bool
let captain: String?
init(name: String, warpSpeed: Bool, captain: String? = nil) {
self.name = name
self.warpSpeed = warpSpeed
self.captain = captain
}
init?(json: JSON) {
guard let
name = json["name"].string,
warpSpeed = json["warpSpeed"].bool
else { return nil }
self.name = name
self.warpSpeed = warpSpeed
self.captain = json["captain"].string
}
var asJSON: JSON {
var json: JSON = [:]
json["name"].string = name
json["warpSpeed"].bool = warpSpeed
json["captain"].string = captain
return json
}
}
就这样.让我们使用它
let enterprise = Starship(name: "Enteriprise D", warpSpeed: true, captain: "JeanLuc Picard")
let json = enterprise.asJSON
let data = try! json.rawData()
// save data to file and reload it
let newJson = JSON(data: data)
let ship = Starship(json: newJson)
ship?.name // "Enterprise D"
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