[Swift] Network connect 두 가지 방법

Network 연결하기

1. url 에 필요한 리소스 
   • base
   • path
   • params
   • header
2. URLComponents에 ⬅️ 만들어진 url 리소스 넣기
3. URLQueryItems에 넣을 쿼리 파라매터(params) 들 추가하기 
4. URLRequest 만들기 ⬅️ URLComponents.url 넣기
5. header 요소들, forEach 문으로 ➡️ URLRequest에 .addValue하여 넣기

 

리팩토링 하기 전

let base = "https://api.github.com/"
let path = "user/\(keyword)"
let params: [String:String] = [:]
let header: [String:String] = ["Content-Type": "application/json"]

let urlComponent = URLComponents(string: base + path)
let queryItems = params.maps { (key: String, value: String) in
    return URLQueryItems(name: key, value: value)
}
urlComponent.queryItems = queryItems

var request = URLRequest(url: urlComponent.url!)

header.forEach{ (key: String, value: String) in
    request.addValue(value, forHTTPHeaderField: key)
}

URLSession.shard
    .dataTaskPublisher(for: request)
    .tryMap{ (data: Data, response: URLResponse) -> Data in // error처리: tryMap(o)
        guard let response = response as? HTTPURLResponse,
            (200..<300).contains(response.statusCode) else {
            let response = response as? HTTPURLResponse
            let statusCode = response.statusCode ?? -1
            throw NetworkError.responseError(statusCode: statusCode)
        }
        return data
    .decode(type: UserProfile.self, decode: JSONDecoder())
    .receive(on: Runloop.main)
    .sink{ completion in
        switch completion {
        case .failure(let error)
            self.user = nil
        case .finished: break
        }
    }.store(in: &subscriptions)

 

 

 

리팩토링 후

• network 연결에 필요한 url resources 들을 만들어서 ➡️ load() 에 넣어준다.
• load() 에서는, urlRequest를 뽑아서, session에 넣고, dataTask 를 만들어 ➡️ publisher 을 return 한다.
• Resource 는 UserProfile 을 받기 위한 resource이니, 타입은 <UserProfile> 이다.

let network = NetworkService(configuration: .default)

// Resource
let resource = Resource<UserProfile>(
    base: "https://api.github.com/",
    path: "users/\(keyword)",
    params: [:],
    header: ["Content-Type":"application/json"])

// NetworkService
network.load(resource)
    .receive(on: Runloop.main)
    .sink{ completion in
        switch completion {
        case .failure(let error):
            self.user = nil
        case .finished: break
        }
    } receiveValue: { user in
        self.user = user
    }.store(in: &subscrptions)