[swift-users] Instantiate Swift class from string

Matthew Davies daviesgeek at gmail.com
Thu Dec 10 17:43:22 CST 2015

I could do that, and that would work, but I figured out a way of doing

import Foundation

protocol Controller {

class Main : Controller {
required init() {}
func index() -> String {
return "INDEX"

let inst = Main()
let method = Main.index

func run<T>(ctrl: Controller.Type, method: (T -> () -> String)) {
let inst = ctrl.init()
let handler = method(inst as! T)

I've posted the source code for the router here:
It's very much incomplete, so keep that in mind when you're looking at it.
The relevant code is here:

Thanks so much for everyone's help!

*Matthew Davies*
Junior Developer, GeoStrategies <http://geostrategies.com>
Director of Photography, OffBlock Films <http://offblockfilms.com>
209-225-3246 <209-225.3246> | 209-202-3284 | daviesgeek at gmail.com |
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On Thu, Dec 10, 2015 at 3:25 PM, Jens Alfke <jens at mooseyard.com> wrote:

> On Dec 10, 2015, at 1:01 PM, Matthew Davies via swift-users <
> swift-users at swift.org> wrote:
>   func get(url: String, ctrl: Controller.Type, method: String) {
>     let inst = ctrl.init()
> *    // Run the method that is passed in here*
>   }
> Since HTTP only has a handful of standard methods/verbs, you can just
> define a Swift method for each one in your protocol (get, put, delete,
> etc.) and use a switch statement on the `method` parameter to dispatch to
> the right one.
> This is a case where you wouldn’t want to use dynamic lookup anyway, since
> the method name you’d be looking up and calling would be chosen by the
> remote client. That’s the sort of thing that’s just begging to be exploited
> (I.e. someone opens a TCP socket and sends “getWithoutCheckingAuth
> /admin/secretdata.txt HTTP/1.1”…)
> —Jens
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