NavigationController重新加载tableview

Question

in swift 1.2 I use this code to reload morenavigationcontroller tableview:

(tabBarController.moreNavigationController.topViewController?.view as! UITableView).reloadData()

after migrated to Swift 2 I get this error and cannot find a solution:

Could not cast value of type 'UIView' (0x11281d1c8) to 'UITableView' (0x11281dbf0).

Any help is appreciated.

Thanks, Max

Answer 1

It is not related to the version of Swift but rather to the version of iOS.

Indeed, the documentation says that the moreNavigationController is a UINavigationController and not a UINavigationController whose topViewController 's view is a `UITableView. Therefore Apple can change the implementation and the view hierarchy whenever they want.

You should never rely on such assumptions because your code may crash even in minor updates. So, be careful doing that.