Reputation:
There's Struct like below
struct User:Codable {
static var shared = User()
var name:String!
var age:Int!
}
User can save their info
var userInfo = User.shared
userInfo.name = "Kevin"
userInfo.age = 28
UserDefaults.standard.set(try? PropertyListEncoder().encode(userInfo), forKey:"UserInformation")
I have tried below
but it seems to create new object
UserDefaults.standard.set(try? PropertyListEncoder().encode(userInfo.age == 32), forKey:"UserInformation")
Is it possible just update userInfo object from UserDefault?
like only change userInfo.age = 32
Upvotes: 2
Views: 1296
Reputation: 274750
You need to decode the object, change its value, then encode it back again:
guard let data = UserDefaults.standard.data(forKey: "UserInformation") else {
// no data associated with the key!
}
guard var obj = try? PropertyListDecoder().decode(User.self, from: data) else {
// something wrong happened with decoding
}
obj.age = 32 // changing the object...
guard let newData = try? PropertyListEncoder().encode(obj) else {
// something wrong happened with encoding
}
UserDefaults.standard.set(newData, forKey: "UserInformation")
Upvotes: 3