NSClassFromString works well in OC, but crashes in Swift

Question

It works fine in OC:

NSString *controllerName = @"SecondViewController";
Class clazz = NSClassFromString(controllerName);
UIViewController *viewController = [[clazz alloc] init];
[self.navigationController pushViewController:viewController animated:YES];

When I use swift:

let controllerName = "SecondViewController"
let controller:AnyClass = NSClassFromString(controllerName)!
let viewController = (controller as! UIViewController.Type).init()
navigationController?.pushViewController(viewController, animated: true)

It crashed at let controller:AnyClass = NSClassFromString(controllerName)!

Any ideas?

What happens if you don't force-unwrap? Does `controller` get set to `nil`? — Avi, Aug 15 '16 at 04:12
similar post http://stackoverflow.com/questions/24030814/swift-language-nsclassfromstring/32265287#32265287 — Khundragpan, Aug 15 '16 at 05:04

score 1 · Accepted Answer · answered Aug 15 '16 at 05:28

Swift classes are namespaced now so instead of "SecondViewController" it'd be "AppName.SecondViewController"

    let nameSpace = NSBundle.mainBundle().infoDictionary!["CFBundleExecutable"] as! String
    let controllerName = "SecondViewController"
    let controller:AnyClass = NSClassFromString(nameSpace + "." + controllerName)!
    let viewController = (controller as! UIViewController.Type).init()
    navigationController?.pushViewController(viewController, animated: true)

NSClassFromString works well in OC, but crashes in Swift

1 Answers1