HTTP Request in Swift 3.0

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HTTP Request in Swift 3.0

思いの外、昔書いたHTTP Request in Swift 2.0が閲覧されているので、続編としてSwift 3.0版を書いた。一部のクラス名からPrefix(NS)が取り除かれたり、プロパティ名がLower Camel Caseになったりと、個人的にコードがすっきり見えるようになり嬉しく感じた。


Request.swift


Request.swift

//: Playground - noun: a place where people can play

import Foundation

class Request {
let session: URLSession = URLSession.shared

// GET METHOD
func get(url: URL, completionHandler: @escaping (Data?, URLResponse?, Error?) -> Void) {
var request: URLRequest = URLRequest(url: url)

request.httpMethod = "GET"
request.addValue("application/json", forHTTPHeaderField: "Accept")
session.dataTask(with: request, completionHandler: completionHandler).resume()
}

// POST METHOD
func post(url: URL, body: NSMutableDictionary, completionHandler: @escaping (Data?, URLResponse?, Error?) -> Void) throws {
var request: URLRequest = URLRequest(url: url)

request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
request.httpBody = try JSONSerialization.data(withJSONObject: body, options: JSONSerialization.WritingOptions.prettyPrinted)

session.dataTask(with: request, completionHandler: completionHandler).resume()
}

// PUT METHOD
func put(url: URL, body: NSMutableDictionary, completionHandler: @escaping (Data?, URLResponse?, Error?) -> Void) throws {
var request: URLRequest = URLRequest(url: url)

request.httpMethod = "PUT"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
request.httpBody = try JSONSerialization.data(withJSONObject: body, options: JSONSerialization.WritingOptions.prettyPrinted)
session.dataTask(with: request, completionHandler: completionHandler).resume()
}

// PATCH METHOD
func patch(url: URL, body: NSMutableDictionary, completionHandler: @escaping (Data?, URLResponse?, Error?) -> Void) throws {
var request: URLRequest = URLRequest(url: url)

request.httpMethod = "PATCH"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
request.httpBody = try JSONSerialization.data(withJSONObject: body, options: JSONSerialization.WritingOptions.prettyPrinted)
session.dataTask(with: request, completionHandler: completionHandler).resume()
}

// DELETE METHOD
func delete(url: URL, completionHandler: @escaping (Data?, URLResponse?, Error?) -> Void) {
var request: URLRequest = URLRequest(url: url)

request.httpMethod = "DELETE"
request.addValue("application/json", forHTTPHeaderField: "Accept")
session.dataTask(with: request, completionHandler: completionHandler).resume()
}
}



使用例


example.swift

let request: Request = Request()

let url: URL = URL(string: "https://api.example.com/path/to/resource")!
let body: NSMutableDictionary = NSMutableDictionary()
body.setValue("value", forKey: "key")

try request.post(url: url, body: body, completionHandler: { data, response, error in
// code
})



所感

HTTP Request in Swift 2.0で公開しているRequestクラスのエラー処理を修正し、thorwsで投げるようにした。Requestクラスを使う側からするとエラー処理を書く必要が出てきて嬉しくないのかもしれない。