viewControllers indexOfObject in swift

Question

I have this objective-c method that i'm trying to re-write to swift.

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    int index = [navigationController.viewControllers indexOfObject:viewController];
    self.pageControl.currentPage = index;
}

I'm having difficulties writing this line in swift:

int index = [navigationController.viewControllers indexOfObject:viewController];

How do i access the IndexOfObject?

Answer 1

In Swift 1.2 (Xcode 6.x)

let index = find(navigationController.viewControllers, viewController)!

In Swift 2.0 (Xcode 7.x)

let arrayOfVCs = navigationController.viewControllers as Array
let index = arrayOfVCs.indexOf(viewController)