How to call api using URLSession in swift 5

Step 1 : Create New swift file link :("WebServiceManager.swift")

Step 2:  Copy and paste this code in you

//
//  WebServiceManager.swift
//

import Foundation
import UIKit

typealias ServiceResponse = (_ reponse:[String : AnyObject], _ error: Error?) -> Void

class WebServiceManager: NSObject, NVActivityIndicatorViewable
{
    static let sharedInstance = WebServiceManager()
    var reachability : Reachability?
    var activity: NVActivityIndicatorView!
    
    let baseURL = SERVER_URL
    
    func checkConnection() -> Bool
    {
        self.reachability = Reachability(hostname: baseURL)
        
        return (reachability?.isReachable)!
    }
    
    func makeHTTPGetRequest(path: String, onCompletion: @escaping ServiceResponse)
    {
        if checkConnection() == false
        {
            let viewController = APPLICATION_DELEGATE.navigationController.topViewController
            
            if (viewController?.isKind(of: NoInternetViewController.self))!
            {
                return
            }
            else
            {
                setCenterViewController(strViewController: "NoInternetViewController", strStoryBoard: "NetworkStoryboard")
                return
            }
        }
        
        let stringURL = baseURL + path
        var request = URLRequest(url: NSURL(string: stringURL)! as URL)
        
        print("reqURL: \(stringURL)")
        
        request.httpMethod = "GET"
        
        if UserDefaults.standard.value(forKey: login_user_user_id) != nil && UserDefaults.standard.value(forKey: login_user_Authorizations) != nil
        {
            request.addValue("header value", forHTTPHeaderField: "header Key")
        }
        
        let session = URLSession.shared
        
        let task = session.dataTask(with: request, completionHandler: {data, response, error -> Void in
            
            do
            {
                let json = try JSONSerialization.jsonObject(with: data!, options: .allowFragments)
                print("reqResponse: \(json)")
                onCompletion(json as! [String : AnyObject], error)
            }
            catch
            {
                onCompletion(["status" :  false as AnyObject, "message" : "Failed to parse json" as AnyObject], error)
                print("Failed to load: \(error.localizedDescription)")
            }
        })
        task.resume()
    }
    
    func
        makeHTTPPostRequest(path: String, body: [String: AnyObject], onCompletion: @escaping ServiceResponse)
    {
        if checkConnection() == false
        {
            let viewController = APPLICATION_DELEGATE.navigationController.topViewController
            
            if (viewController?.isKind(of: NoInternetViewController.self))!
            {
                return
            }
            else
            {
                setCenterViewController(strViewController: "NoInternetViewController", strStoryBoard: "NetworkStoryboard")
                return
            }
        }
                
        let stringURL = baseURL + path
        var request = URLRequest(url: NSURL(string: stringURL)! as URL)
        
        print("reqURL: \(stringURL)")
        print("reqObject:\(body)")
        
        var jsonString: String = ""
        jsonString = convertDictToString(dict: body)
        print("json Object:\(jsonString)")
        
        request.httpMethod = "POST"
        request.timeoutInterval = 60
        
        if UserDefaults.standard.value(forKey: login_user_user_id) != nil && UserDefaults.standard.value(forKey: login_user_Authorizations) != nil
        {
           request.addValue("header value", forHTTPHeaderField: "header Key")
        }
        
        request.httpBody =  jsonString.data(using: .utf8)
        let session = URLSession.shared
        
        let task = session.dataTask(with: request, completionHandler: {data, response, error -> Void in
            
            DispatchQueue.main.sync
                {                    
                    guard let data = data, error == nil else {     // check for fundamental networking error
                        print("error=\(String(describing: error))")
                        return
                    }
                    
                    do
                    {
                        let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments)
                        
                        print("reqResponse:\(json)")
                        onCompletion(json as! [String : AnyObject], error)
                    }
                    catch
                    {
                        onCompletion(["status" : false as AnyObject, "message" : "Failed to parse json" as AnyObject], error)
                        print("Failed to load: \(error.localizedDescription)")
                    }
            }
        })
        task.resume()
    }
    
    func convertDictToString(dict :[String:AnyObject]) -> String
    {
        var finalString = ""
        
        for (key, value) in dict
        {
            if let str = value as? String
            {
                finalString = finalString + key + "=" + str.addingPercentEncodingForQueryParameter()!
            }
            else if let arr = value as?[AnyObject]
            {
                let data = try! JSONSerialization.data(withJSONObject: arr, options: .prettyPrinted)
                finalString = finalString + key + "=" + String(data: data, encoding: String.Encoding.utf8)!
            }
            else
            {
                let data = try! JSONSerialization.data(withJSONObject: value as! [String : AnyObject], options: .prettyPrinted)
                finalString = finalString + key + "=" + String(data: data, encoding: String.Encoding.utf8)!
                // finalString = finalString + key + "=" + convertDictToString(dict: value as! [String : AnyObject])
            }
            finalString = finalString + "&"
        }
        finalString.removeLast()
        return finalString
    }
    
    func UploadImage(path: String,parameters: Dictionary<String,AnyObject>?,filename:String,image:UIImage, onCompletion:@escaping ServiceResponse)
    {
        let BOUNDARY:String = "AaB03x"
        
        let strFilename = "\(String(describing: UserDefaults.standard.value(forKey: "user_id"))).jpeg" as AnyObject as! String
        
        let stringURL = baseURL + path
        
        print("reqURL:\(stringURL)")
        print("reqObject:\(String(describing: parameters))")
        
        let url = NSURL(string:  stringURL)!
        let request:NSMutableURLRequest = NSMutableURLRequest(url: url as URL, cachePolicy: NSURLRequest.CachePolicy.reloadIgnoringLocalCacheData, timeoutInterval: 10)
        let MPboundary:String = "--\(BOUNDARY)"
        let endMPboundary:String = "\(MPboundary)--"
        
        //convert UIImage to NSData
        
        let data = image.jpegData(compressionQuality: 0.01)
        
        let body:NSMutableString = NSMutableString();
        
        if parameters != nil
        {
            for (key, value) in parameters!
            {
                body.appendFormat("\(MPboundary)\r\n" as NSString)
                body.appendFormat("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n" as NSString)
                body.appendFormat("\(value)\r\n" as NSString)
            }
        }
        
        // set upload image, name is the key of image
        body.appendFormat("%@\r\n",MPboundary)
        body.appendFormat("Content-Disposition: form-data; name=\"\(filename)\"; filename=\"\(strFilename)\"\r\n" as NSString)
        body.appendFormat("Content-Type: image/jpeg\r\n\r\n")
        let end:String = "\r\n\(endMPboundary)"
        
        let myRequestData:NSMutableData = NSMutableData();
        myRequestData.append(body.data(using: String.Encoding.utf8.rawValue)!)
        myRequestData.append(data!)
        myRequestData.append(end.data(using: String.Encoding.utf8)!)
        let content:String = "multipart/form-data; boundary=\(BOUNDARY)"
        request.setValue(content, forHTTPHeaderField: "Content-Type")
        request.setValue("\(myRequestData.length)", forHTTPHeaderField: "Content-Length")
        request.httpBody = myRequestData as Data
        request.httpMethod = "POST"
        
        if UserDefaults.standard.value(forKey: login_user_user_id) != nil && UserDefaults.standard.value(forKey: login_user_Authorizations) != nil
        {
            request.addValue("header value", forHTTPHeaderField: "header Key")
        }
        
        let task = URLSession.shared.dataTask(with: request as URLRequest, completionHandler:
        {
            data, response, error in
            
            DispatchQueue.main.sync
                {
                    guard let data = data, error == nil else {
                        print("error=\(String(describing: error))")
                        return
                    }
                    
                    do
                    {
                        let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments)
                        
                        print("reqResponse:\(json)")
                        onCompletion(json as! [String : AnyObject], error)
                    }
                    catch
                    {
                        onCompletion(["status" : false as AnyObject, "message" : "Failed to parse json" as AnyObject], error)
                        print("Failed to load: \(error.localizedDescription)")
                    }
            }
        })
        task.resume()
    }
}



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