POP網絡(一)

override func viewDidLoad() {
        super.viewDidLoad()
        let request = LGPersonRequest(name: "kody")
        request.send { (person) in
            self.updataUI(person: person!)
        }
       
    }
    
    func updataUI(person:LGPerson){
        imageView.image = UIImage(named: person.iconName)
        nickName.text   = person.name
        ageLabel.text   = person.age
        hobbyLabel.text = person.hobby
        petPhraseLabel.text = person.petPhrase
    }
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• 不一樣的接口公用一個LGRequest協議
• 不一樣的接口對應不一樣的LGXXXRequest結構體，LGXXXRequest實現LGRequest協議
• associatedtype Response func parse(data: Data) -> Response? 關聯類型，泛型
• LGXXXRequest關聯具體的模型typealias Response = type，parse返回關聯的模型type

//LGRequest.swift
import UIKit

enum LGHTTPMethod: String {
    case GET
    case POST
}

protocol LGRequest {
    var host: String { get }
    var path: String { get }
    
    var method: LGHTTPMethod { get }
    var parameter: [String: Any] { get }
    
    associatedtype Response
    func parse(data: Data) -> Response?
}

extension LGRequest {
    func send(handler: @escaping (Response?) -> Void) {
        let url = URL(string: host.appending(path))!
        var request = URLRequest(url: url)
        request.httpMethod = method.rawValue
        // 在示例中咱們不須要 `httpBody`，實踐中可能須要將 parameter 轉爲 data
        // request.httpBody = ...
        let task = URLSession.shared.dataTask(with: request) {
            data, response, error in
            if let data = data, let res = self.parse(data: data) {
                DispatchQueue.main.async { handler(res) }
            } else {
                DispatchQueue.main.async { handler(nil) }
            }
        }
        task.resume()
    }
}

struct LGPersonRequest: LGRequest {
    typealias Response = LGPerson
    let name: String
    
    let host = "http://127.0.0.1:5000"
    var path: String {
        return "/pythonJson/getTeacherInfo/?username=\(name)"
    }
    let method: LGHTTPMethod = .GET
    let parameter: [String: Any] = [:]
    
    func parse(data: Data) -> LGPerson? {
        return LGPerson(data: data)
    }
}

//struct LGLoginRequest: LGRequest {
//    typealias Response = type
//    
//}

//struct LGHomeRequest: LGRequest {
//    
//}
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• 模型LGPerson結構體

//LGPerson.swift
import UIKit

struct LGPerson {
    let name: String
    let iconName: String
    let age: String
    let hobby: String
    let petPhrase: String

    init?(data: Data) {
        guard let obj = try? JSONSerialization.jsonObject(with: data, options: .allowFragments) as? [String: Any] else {
            return nil
        }
        guard let name = obj["name"] as? String else {
            return nil
        }
        guard let iconName = obj["iconName"] as? String else {
            return nil
        }
        guard let age = obj["age"] as? String else {
            return nil
        }
        guard let hobby = obj["hobby"] as? String else {
            return nil
        }
        guard let petPhrase = obj["petPhrase"] as? String else {
            return nil
        }
        self.name = name
        self.iconName = iconName
        self.age = age
        self.hobby = hobby
        self.petPhrase = petPhrase
    }
}
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