WebService API Method in Swift 3 and Swift 4? - ios

Question

I am new to Swift iOS and i want to create a separate method in separate class(like NSObject) of web services so that i can use it in any ViewController and parse any type of JSON response using NSURLSession and Alamofire . Could someone help me.

Answer 1

class WebRequester: NSObject {
static let shared = WebRequester()
let session = URLSession.shared
func request(urlStr:String, parameter:String, token:String? = nil, callback:#escaping (_ result:NSDictionary?, error:Error?) -> Void) {
let url = URL(string: BaseURL + urlStr)
debugPrint("=====================")
debugPrint(url ?? "")
debugPrint(parameter)
debugPrint("=====================")
var request = URLRequest(url: url!)
request.httpMethod = "POST"
request.httpBody = parameter.data(using: String.Encoding.utf8)
print("Token :", (token ?? ""))
request.setValue(token, forHTTPHeaderField: "Authorization")
let task = session.dataTask(with: request) { (data, response, error) in
DispatchQueue.main.async {
if error == nil {
do {
let jsonObj = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.allowFragments)
if let dic = jsonObj as? NSDictionary {
callback(dic, error)
}
}
catch {
callback(nil, error)
}
}
else {
callback(nil, error)
}
}
}
task.resume()
}
}
You need to pass parameter as string
var params = "user_id=" + "12"
params += "&course_id=" + "1"
WebRequester.shared.request(urlStr: urlStr, parameter: params) { (result, error) in
DispatchQueue.main.async {
print(result)
}
}
you can also pass parameter as dictionary but need to convert in string using following Dictionary extension
request.httpBody = parameter.stringFromHttpParameters().data(using:
String.Encoding.utf8)
extension Dictionary {
func stringFromHttpParameters() -> String {
let parameterArray = self.map { (key, value) -> String in
let percentEscapedKey = (key as! String).addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!
let percentEscapedValue = (value as AnyObject).addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!
return "\(percentEscapedKey)=\(percentEscapedValue)"
}
return parameterArray.joined(separator: "&")
}
}
WebRequester
Http Request
multipart with single image
multipart with multiple image
You need to change response structure as per your api response
you need to set authorisation and api key as per your api
WebRequester

Answer 2

Here is a working code of Alamofire (swift 4)
Add this class in your project
import Foundation
import UIKit
import Alamofire
import SystemConfiguration
class APPWebService: NSObject {
class open func callPostApi(api:String, parameters:[String:AnyObject]?, complition:#escaping (AnyObject)->Void)
{
if self.IsInternetAvailable() == false {
self.showAlert(title: "Whoops :(", message: "No internet connection.")
return
}
let parameters = parameters
// Encode Data
let base64EncodedString = toBase64EncodedString(toJsonString(parameters: parameters!))
Alamofire.request(api, method: .post, parameters: ["jsondata":base64EncodedString])
.response { response in
do {
if response.error != nil{
print(response.error as Any, terminator: "")
}
if let jsonDict = try JSONSerialization.jsonObject(with: (response.data as Data?)!, options: []) as? [String: AnyObject]{
print(jsonDict as Any, terminator: "")
complition(jsonDict as AnyObject)
}else{
self.showAlert(title: "Whoops", message: "Something went wrong. Please, try after sometime.")
return
}
} catch _ {
print("Exception!")
}
}
}
// For check Internet Connection
class open func IsInternetAvailable () -> Bool {
var zeroAddress = sockaddr_in()
zeroAddress.sin_len = UInt8(MemoryLayout.size(ofValue: zeroAddress))
zeroAddress.sin_family = sa_family_t(AF_INET)
let defaultRouteReachability = withUnsafePointer(to: &zeroAddress) {
$0.withMemoryRebound(to: sockaddr.self, capacity: 1) {zeroSockAddress in
SCNetworkReachabilityCreateWithAddress(nil, zeroSockAddress)
}
}
var flags = SCNetworkReachabilityFlags()
if !SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) {
return false
}
let isReachable = flags.contains(.reachable)
let needsConnection = flags.contains(.connectionRequired)
return (isReachable && !needsConnection)
}
// Display Alert
class open func showAlert(title:String,message:String){
let alert = UIAlertView(title:title,message: "\n" + message,delegate: nil ,cancelButtonTitle: "Ok")
alert.show()
}
// For Convert to JSON String
class open func toJsonString(parameters:[String:AnyObject]) -> String
{
var jsonData: NSData?
do {
jsonData = try JSONSerialization.data(withJSONObject: parameters, options:JSONSerialization.WritingOptions(rawValue: 0)) as NSData?
} catch{
print(error.localizedDescription)
jsonData = nil
}
let jsonString = NSString(data: jsonData! as Data, encoding: String.Encoding.utf8.rawValue)! as String
return jsonString
}
// For Convert to Base64Encoded String
class open func toBase64EncodedString(_ jsonString : String) -> String
{
let utf8str = jsonString.data(using: .utf8)
let base64Encoded = utf8str?.base64EncodedString(options: [])
return base64Encoded!
}
}
Use Like this
func ServiceCall()
{
// Create parameter list
let parameters = [
"name":"Abc",
"address":"Xyz",
"contact":"1234567890"
]
// set webservice Url
let ReqURL = "your webservice url here"
APPWebService.callPostApi(api: ReqURL, parameters: parameters as [String : AnyObject]?) { (dict) -> Void in
print(dict) // Your response is here.
}
}