objective-c - iOS:处理 didSelectViewController 时的警告

Question

以下代码:

- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {
    if (viewController == [tabBarController.viewControllers objectAtIndex:0]) {
        MySearchViewController *controller = viewController;
        [[controller tableView] reloadData];
    }
}

产生以下警告:

Incompatible pointer types initializing 'MySearchViewController *__strong' with an expression of type 'UIViewController *__strong'

将 viewController 转换为正确的类 MySearchViewController 以调用其方法的正确方法是什么？

Answer 1

只需更改为:

- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {
    if (viewController == [tabBarController.viewControllers objectAtIndex:0] && [viewController isKindOfClass:[MySearchViewController class]]) {
        MySearchViewController *controller = (MySearchViewController *)viewController;
        [[controller tableView] reloadData];
    }
}