Simple GET and Parse JSON data with dataTaskWithRequest

gistfile1.txt

let firstTodoEndpoint: String = "http://jsonplaceholder.typicode.com/todos/1"
let firstTodoUrlRequest = NSMutableURLRequest(URL: NSURL(string: firstTodoEndpoint)!) firstTodoUrlRequest.HTTPMethod = "DELETE"
let session = NSURLSession.sharedSession()
let task = session.dataTaskWithRequest(firstTodoUrlRequest) { (data, response, error) in
guard let _ = data else {
    print("error calling DELETE on /todos/1")
return
}
  print("DELETE ok")
}
task.resume()

postRequest.swift

    override func viewDidLoad() {
        super.viewDidLoad()
        
        let todosEndPoint = "http://jsonplaceholder.typicode.com/todos"
        guard let todosURL = NSURL(string: todosEndPoint) else {
            print("Error: cannot create URL")
            return
        }
        
        let todoUrlRequest = NSMutableURLRequest(URL: todosURL)
        todoUrlRequest.HTTPMethod = "POST"
        
        let newTodo = ["title": "First todo", "completed":false, "userId": 1]
        let jsonTodo : NSData
        
        do {
            jsonTodo = try NSJSONSerialization.dataWithJSONObject(newTodo, options: [])
            todoUrlRequest.HTTPBody = jsonTodo
        } catch {
            print("Error: cannot create JSON from todo ")
            return
        }
        
        
        
        let session = NSURLSession.sharedSession()
        let task = session.dataTaskWithRequest(todoUrlRequest) { (data, response, error) in
            guard error == nil else {
                print("error calling GET on /todos/1")
                print(error)
                return
            }
            
            guard let responseData = data else {
                print("Error: did not receive data")
                return
            }
            
            do {
            
            guard let todo = try NSJSONSerialization.JSONObjectWithData(responseData, options: []) as? [String: AnyObject] else {
                print("error trying to convert data to JSON")
                    return
                }
                print("The to do is : " + todo.description)
            
            guard let todoTitle = todo["title"] as? String else {
                print("Could not get todo title from JSON")
                return
            }
                print("The title is: " + todoTitle)
            } catch {
                print("error trying to convert data to JSON")
                return
            }
        }
        
        task.resume()
        
    }

simplejson.swift

let newTodo = ["title": "Frist todo", "completed": false, "userId": 1] let jsonTodo: NSData
do {
  jsonTodo = try NSJSONSerialization.dataWithJSONObject(newTodo, options: [])
  todosUrlRequest.HTTPBody = jsonTodo
} catch {
  print("Error: cannot create JSON from todo")
return
}
todosUrlRequest.HTTPBody = jsonTodo
let session = NSURLSession.sharedSession()
let task = session.dataTaskWithRequest(todosUrlRequest) { (data, response, error) in
guard error == nil else {
print("error calling POST on /todos/1") print(error)
return
}
guard let responseData = data else {
    print("Error: did not receive data")
return
}
  // parse the result as JSON, since that's what the API provides
do {
guard let receivedTodo = try NSJSONSerialization.JSONObjectWithData(responseData, options: []) as? [String: AnyObject] else {
      print("Could not get JSON from responseData as dictionary")
return
    }
    print("The todo is: " + receivedTodo.description)
guard let todoID = receivedTodo["id"] as? Int else { print("Could not get todoID as int from JSON") return
}
print("The ID is: \(todoID)") } catch {
    print("error parsing response from POST on /todos")
return
} }
task.resume()

• 如果只是简单的parse的话，用GET，那么使用NSURLRequest即可完成要求
• 如果要POST的话，要使用NSMutableURLRequest，同时指定method是HTTPMethod = "POST"