用Alamofire发起网络请求 - swift4

1.创建一个NetWorkingTool单例

import UIKit
import Alamofire

class NetWorkingTool: NSObject {
    static let shendInstance = NetWorkingTool()
    private override init() {}
    public func getData(url: String, dataBlock:@escaping (_ resData: Any) ->(), errorBlock:@escaping (_ error: Error) -> ()) -> Void {
        Alamofire.request(url).responseJSON { (responseData) in
            if let json = responseData.result.value {
                dataBlock(json)
            }else{
                errorBlock(responseData.error!)
            }
        }
    }
}

2.在ViewController发起调用

import UIKit
class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        NetWorkingTool.shendInstance.getData(url: "https://www.v2ex.com/api/nodes/show.json?name=python", dataBlock: { (responseData) in
            //返回的是数组
            guard responseData is [String: Any] else {
                let dataArray = responseData as! Array<[String: Any]>
                for dict in dataArray {
                    print(dict["title"]!, dict["id"]!)
                }
                return
            }
            //返回的是字典
            guard responseData is [String: Dictionary<String, Any>] else {
                let dataArray = responseData as! Dictionary<String, Any>
                for value in dataArray {
                    print(type(of: value))
                }
                return
            }
        }) { (error) in
            print(error)
        }
    }
   }