ios - swift 中的 viewControllers indexOfObject

Question

我有这个 objective-c 方法，我正在尝试将其重写为 swift。

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

我在快速编写这一行时遇到困难:

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

我如何访问 IndexOfObject？

Answer 1

在 Swift 1.2 (Xcode 6.x) 中

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

在 Swift 2.0 (Xcode 7.x) 中

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