Make REST API call in Swift

Question

I'm trying to use Swift to make a GET call to a REST API, and have tried to follow numerous tutorials, but can't figure it out. Either because I cannot figure out how to translate all the Obj-C to Swift, or because half of the methods n' such are deprecated. Does anyone know how to make the call, and parse returned JSON data?

Answer 1

Swift 5 & 4

let params = ["username":"john", "password":"123456"] as Dictionary<String, String>  var request = URLRequest(url: URL(string: "http://localhost:8080/api/1/login")!) request.httpMethod = "POST" request.httpBody = try? JSONSerialization.data(withJSONObject: params, options: []) request.addValue("application/json", forHTTPHeaderField: "Content-Type")  let session = URLSession.shared let task = session.dataTask(with: request, completionHandler: { data, response, error -> Void in     print(response!)     do {         let json = try JSONSerialization.jsonObject(with: data!) as! Dictionary<String, AnyObject>         print(json)     } catch {         print("error")     } })  task.resume() 

Answer 2

You can do like this :

var url : String = "http://google.com?test=toto&test2=titi" var request : NSMutableURLRequest = NSMutableURLRequest() request.URL = NSURL(string: url) request.HTTPMethod = "GET"  NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue(), completionHandler:{ (response:NSURLResponse!, data: NSData!, error: NSError!) -> Void in     var error: AutoreleasingUnsafeMutablePointer<NSError?> = nil     let jsonResult: NSDictionary! = NSJSONSerialization.JSONObjectWithData(data, options:NSJSONReadingOptions.MutableContainers, error: error) as? NSDictionary      if (jsonResult != nil) {         // process jsonResult     } else {        // couldn't load JSON, look at error     }   }) 

EDIT : For people have problem with this maybe your JSON stream is an array [] and not an object {} so you have to change jsonResult to NSArray instead of NSDictionary