Quick & dirty REST API calls with Swift 2.2. See http://grokswift.com/simple-rest-with-swift/

UISwiftRestDemo

// MARK: Using NSURLSession
  
// Get first todo item
let todoEndpoint: String = "http://jsonplaceholder.typicode.com/todos/1"
guard let url = NSURL(string: todoEndpoint) else {
  print("Error: cannot create URL")
  return
}
let urlRequest = NSURLRequest(URL: url)

let config = NSURLSessionConfiguration.defaultSessionConfiguration()
let session = NSURLSession(configuration: config)

let task = session.dataTaskWithRequest(urlRequest) {
  (data, response, error) in
  guard let responseData = data else {
    print("Error: did not receive data")
    return
  }
  guard error == nil else {
    print("error calling GET on /todos/1")
    print(error)
    return
  }
  // parse the result as JSON, since that's what the API provides
  do {
    guard let todo = try NSJSONSerialization.JSONObjectWithData(responseData, options: []) as? [String: AnyObject] else {
      // TODO: handle
      print("Couldn't convert received data to JSON dictionary")
      return
    }
    // now we have the todo, let's just print it to prove we can access it
    print("The todo is: " + todo.description)
    
    // the todo object is a dictionary
    // so we just access the title using the "title" key
    // so check for a title and print it if we have one
    guard let todoTitle = todo["title"] as? String else {
      print("Could not get todo title from JSON")
    }
    print("The title is: " + todoTitle)
  } catch  {
    print("error trying to convert data to JSON")
  }
}
task.resume()

// Create new todo
let todosEndpoint: String = "http://jsonplaceholder.typicode.com/todos"
guard let todosURL = NSURL(string: todosEndpoint) else {
  print("Error: cannot create URL")
  return
}
let todosUrlRequest = NSMutableURLRequest(URL: todosURL)
todosUrlRequest.HTTPMethod = "POST"
let newTodo: NSDictionary = ["title": "Frist todo", "body": "I iz fisrt", "userId": 1, "completed": 0]
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()

let task = session.dataTaskWithRequest(todosUrlRequest) {
  (data, response, error) in
  guard let responseData = data else {
    print("Error: did not receive data")
    return
  }
  guard error == nil else {
    print("error calling POST on /todos/1")
    print(error)
    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()
  
// Delete first todo
let firstTodoEndpoint: String = "http://jsonplaceholder.typicode.com/todos/1"
let firstTodoUrlRequest = NSMutableURLRequest(URL: NSURL(string: firstTodoEndpoint)!)
firstTodoUrlRequest.HTTPMethod = "DELETE"

let session = NSURLSession()

let task = session.dataTaskWithRequest(firstTodoUrlRequest, completionHandler: {
  (data, response, error) in
  guard let _ = data else {
    print("error calling DELETE on /todos/1")
    return
  }
  print("DELETE ok")
})
task.resume()

// MARK: Using Alamofire

// Get first todo
let todoEndpoint: String = "http://jsonplaceholder.typicode.com/todos/1"
Alamofire.request(.GET, todoEndpoint)
  .responseJSON { response in
    guard response.result.error == nil else {
      // got an error in getting the data, need to handle it
      print("error calling GET on /todos/1")
      print(response.result.error!)
      return
    }
    
    guard let value = response.result.value else {
      print("no result data received when calling GET on /todos/1")
      return
    }
    // handle the results as JSON
    let todo = JSON(value)
    // now we have the results, let's just print them though a tableview would definitely be better UI:
    print("The todo is: " + todo.description)
    guard let title = todo["title"].string else {
      print("error parsing /todos/1")
      return
    }
    // to access a field:
    print("The title is: " + title)
}

// Create new todo
let todosEndpoint: String = "http://jsonplaceholder.typicode.com/todos"
let newTodo = ["title": "Frist Psot", "completed": 0, "userId": 1]
Alamofire.request(.POST, todosEndpoint, parameters: newTodo, encoding: .JSON)
  .responseJSON { response in
    guard response.result.error == nil else {
      // got an error in getting the data, need to handle it
      print("error calling POST on /todos/1")
      print(response.result.error!)
      return
    }
    
    guard let value = response.result.value else {
      print("no result data received when calling GET on /todos/1")
      return
    }
    let todo = JSON(value)
    print("The todo is: " + todo.description)
}

// Delete first todo
let firstTodoEndpoint: String = "http://jsonplaceholder.typicode.com/todos/1"
Alamofire.request(.DELETE, firstTodoEndpoint)
  .responseJSON { response in
    guard response.result.error == nil else {
      // got an error in getting the data, need to handle it
      print("error calling DELETE on /todos/1")
      print(response.result.error!)
      return
    }
    print("DELETE ok")
}

Fixed postsUrlRequest not being created.

Hi dooch,
How you're storing the OAuth token looks ok. What kind of error are you getting back when your post fails?

Switched example to use Todo items instead of posts because that was a little confusing.