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?

In Swift 2.0 you could you the indexOf method, see http://stackoverflow.com/a/24069331/3617012 — iOSX, Sep 15 '15 at 09:11
If you are using Xcode 7 (not yet released officially), then you have Swift 2.0 at your fingertips. Xcode 6.4 supports Swift 1.2, and you would use the `find` function instead of `indexOf`. How to use it is also explained in the answer that I've linked to in my previous comment. — iOSX, Sep 15 '15 at 09:23

score 5 · Accepted Answer · answered Sep 15 '15 at 09:49

5

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)

answered Sep 15 '15 at 09:49

Nishant

12,529
9
59
94

score 1 · Answer 2 · edited Mar 08 '18 at 02:52

1

In Swift 4, for TabBarController, to get index of selected view controller:

let index = tabBarController.viewControllers?.index(of: viewController)

edited Mar 08 '18 at 02:52

Pang

9,564
146
81
122

answered Mar 08 '18 at 02:12

Ashim Dahal

1,097
13
15

Jawad Ali · Answer 3 · 2021-07-26T19:15:31.807

1

In Swift 5 index(of element: Element) is deprecated .. so use

let index = navigationController?.viewControllers.firstIndex(of: yourController)

edited Jul 26 '21 at 19:15

answered May 13 '20 at 18:00

Jawad Ali

13,556
3
32
49

score 0 · Answer 4 · answered Mar 14 '17 at 12:50

0

In Swift 3.0 (Xcode 8.x)

let index = navigationController.viewControllers?.index(of: viewController)

answered Mar 14 '17 at 12:50

Ilkhom Khodjaev

99
1
6

viewControllers indexOfObject in swift

4 Answers4