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    1. self.navigationController.tabBarController.selectedIndex 不起作

      self.navigationController.tabBarController.selectedIndex not working(self.navigationController.tabBarController.selectedIndex 不起作用)
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                本文介绍了self.navigationController.tabBarController.selectedIndex 不起作用的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                问题描述

                我有一个 UITabBarController,其中包含 4 个不同的 UIViewControllers.

                在第一个选项卡上有一个 UINavigationViewController,其中包含其子 UIViewController.在不点击标签栏的情况下,我想将用户带到第二个标签上.为此,我尝试了:

                I have a UITabBarController which containing 4 different UIViewControllers.

                On first tab there is a UINavigationViewController which contains its child UIViewController. without tapping the tab bar, i want to take user on second tab. For this I tried:

                self.navigationController.tabBarController.selectedIndex = 1;

                但它不起作用.

                忽略任何错误我是新手.

                ignore any mistake i am a newbie.

                谢谢.

                推荐答案

                在尝试更改选项卡之前,请执行以下操作:

                Do the following, before trying to change tab:

                UITabBarController *tab = self.tabBarController;
                
                if (tab) {
                   NSLog(@"I have a tab bar");
                   [self.tabBarController setSelectedIndex: 1];
                }
                else {
                   NSLog(@"I don't have one");
                }
                

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