I'm trying to store custom codable struct with mutated property, but I'm always getting nil
for that property.
例如,具有可编码的结构:
struct Test1: Codable {
var testDate: Date? = nil
let name: String
let age: Int
enum CodingKeys: String, CodingKey {
case name
case age
}
}
with the following example JSON we will decode provided struct, and assign custom property testDate
:
let json = """
{
"name": "test",
"age": 30,
}
"""
let jsonData = Data(json.utf8)
var test1 = try? JSONDecoder().decode(Test1.self, from: jsonData)
test1?.testDate = Date()
然后,我们将尝试将此结构存储在userDefaults中:
var currentTest: Test1? {
get {
let defaults = UserDefaults.standard
guard let testData = defaults.object(forKey: "test1") as? Data,
let test = try? PropertyListDecoder().decode(Test1.self,
from: testData) else {
return nil
}
return test
}
set {
let defaults = UserDefaults.standard
defaults.set(try? PropertyListEncoder().encode(newValue), forKey: "test1")
}
}
While this works for all of the codable properties, when I try to access a custom property, such as testDate
I'm getting nil:
currentTest?.testDate = nil
有没有一种方法可以存储“嵌套”属性,而无需将它们作为单独的实例存储在UserDefautls中?
gist example - https://gist.github.com/ignotusverum/0cb9b57eef021eed3680530df519cedf