iOS tabBarController 检测 AppDelegate 中的选定索引

iOS tabBarController detect selected index in AppDelegate

AppDelegate.h *****

@interface AppDelegate : UIResponder <UIApplicationDelegate,UITabBarControllerDelegate,UITabBarDelegate>

AppDelegate.m *****

- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
    NSLog(@"%lu",(unsigned long)tabBarController.selectedIndex);
}

这个方法不管用吗? 单击标签栏项目时我想滚动到顶部 请帮助:)

您只需在第一个 viewController 的 viewDidLoad 方法中添加这一行:

self.tabBarController.delegate = ((AppDelegate *)[UIApplication sharedApplication].delegate);