ios - 当使用新的 ViewController 更新 View 时，UINavigationController 必须调用方法

Question

我有一个 UINavigationControllerSubclass。当 View Controller 弹出到某个新的 View Controller 时(通过 navigationController.popViewController、navigationController.popToRootViewController 甚至通过手动从左向右滑动)

我需要在导航 Controller 内部调用:

viewController.newTopViewController.updateBackButtonTitle()

实现这一目标的最佳方法是什么？

Answer 1

一种方法如下:

class CustomNavigationController: UINavigationController {

    override func popToRootViewController(animated: Bool) -> [UIViewController]? {
        shouldUpdateBackButtonTitle()
        return super.popToRootViewController(animated: animated)
    }

    override func popViewController(animated: Bool) -> UIViewController? {
        shouldUpdateBackButtonTitle()
        return super.popViewController(animated: animated)
    }

    private func shouldUpdateBackButtonTitle() {
        viewController.newTopViewController.updateBackButtonTitle()
    }
}