闲来无聊，研究了一下swift，顺便写了个网络请求类来练练手。

import UIKit
import AFNetworking
import Result
import ReactiveSwift

enum request_type: Int {
    case GET = 0
    case POST = 1
}

class RequestManager: AFHTTPSessionManager {
    static let instance: RequestManager = {
        let instance = RequestManager()
        instance.requestSerializer = AFHTTPRequestSerializer()
        instance.responseSerializer = AFHTTPResponseSerializer()
        instance.responseSerializer.acceptableContentTypes = ["text/html","application/json","text/plain"]
        return instance
    }()
    //function rac
    func netRequest(type:request_type,url:String,param:[String:Any]?) -> Signal<Any, NoError> {
        let (signal,observer) = Signal<Any, NoError>.pipe()
        let success = { (task: URLSessionDataTask, json: Any)->() in
            let data = json as? Data
            let str:String = String(data: data!, encoding: String.Encoding.utf8)! as String
            observer.send(value: str )
            observer.sendCompleted()
        }
        let failure = { (task: URLSessionDataTask?, error: Error) -> () in
            print("网络请求错误 \(error)")
            observer.send(value: error)
            observer.sendCompleted()
        }
        guard type == .GET else {
            post(url, parameters: param, progress: nil, success: success, failure: failure)
            return signal
        }
        get(url, parameters: param, progress: nil, success: success, failure: failure)
        return signal
    }
    //function block
    func request(type: request_type, url: String, param: [String: AnyObject]?, completion: @escaping (AnyObject?) -> ()) {
        let success = { (task: URLSessionDataTask, json: Any)->() in
            let data = json as? Data
            let str:String = String(data: data!, encoding: String.Encoding.utf8)! as String
            completion(str as AnyObject?)
        }
        let failure = { (task: URLSessionDataTask?, error: Error) -> () in
            print("网络请求错误 \(error)")
            completion(nil)
        }

        if type == .GET {
            get(url, parameters: param, progress: nil, success: success, failure: failure)
        } else {
            post(url, parameters: param, progress: nil, success: success, failure: failure)
        }
    }
}

使用方式也挺简单

RequestManager.instance.netRequest(type: request_type.GET, url: url, param: nil).observeResult({ (result:Any) in
            print(result)
        })
        RequestManager.instance.request(type: request_type.GET, url: url, param: nil) { (json:AnyObject?) in
            print(json ?? "")
        }