Swift use ObjectMapper with singleton - json

Question

I want use ObjectMapper to parsing Json string within a singleton situation. Example code :
class User: Mappable {
var username: String?
var signature: String?
//Singleton
static let shared = User()
private init() {}
//Mappable functions
required init?(map: Map) {}
func mapping(map: Map) {
username <- map["username"]
signature <- map["signature"]
}
//Update userInfo after network request
func getUserInfo() {
//Network things
...
//Example data
let data = [
"username": "Eason",
"signature": "I love U"
]
//Some thing like this to update userInfo
Mapper<User>().map(data)
}
}
So, what is the right way to use ObjectMapper in singleton situation?

Answer 1

I prefer the following option.
1) UserManager (singleton):
class UserManager: NSObject {
static let shared = UserManager()
var profile: UserProfile?
private override init() {}
func loadUserProfile(completion: #escaping () -> ()) {
RestClient.shared.getUserProfile() { [weak self] (profile, error) in
guard let `self` = self else { return }
self.profile = profile as? UserProfile
completion()
}
}
}
2) User model:
class UserProfile: Mappable {
var username: String?
var signature: String?
required init?() {}
required init?(map: Map) {}
func mapping(map: Map) {
username <- map ["username"]
signature <- map ["signature"]
}
}
3) RestClient
typealias IdResponseBlock = (_ swiftObj: Any?, _ error: Error?) -> Void
class RestClient: NSObject {
static let shared = RestClient()
// Additional class where sending and receiving information from the server occurs
private var http = HttpService()
let baseUrl = ApiSettings.shared.kServerBaseURL
override init() {
super.init()
}
func parseData<P: BaseMappable>(object: Any, modelCls: P.Type, response: (IdResponseBlock)) {
if object is NSArray {
let result = Mapper<P>().mapArray(JSONObject: object)
return response(result, nil)
}
if object is NSDictionary {
let model: P = Mapper<P>().map(JSONObject: object)!
return response(model, nil)
}
}
//MARK: - API
//MARK: - User
func getUserProfile(resp: #escaping IdResponseBlock) {
let url = baseUrl + Requests.profile
http.queryBy(url, method: .get, queue: .background, resp: { (response, error) in
if let err = error {
return resp(nil, err)
}
guard let data = response else {
return resp(nil, error)
}
let jsonData = JSON(data)["data"]
self.parseData(object: jsonData.rawValue,
modelCls: UserProfile.self,
response: resp)
})
}
}