我得到了以下流程
在“主页”选项卡上选择名为“[self.parentViewController.tabBarController setSelectedIndex:2];
”的“晚上”以转到“类(class)”选项卡
在“类别”选项卡中选择任何类别
转到下一个 VC
再次选择“回家”和“晚上”
从Home Tab
我执行[self.parentViewController.tabBarController setSelectedIndex:2];
到Class Tab
。然后,从嵌入 NavigationController
中的 Class Tab,我将使用 seague
转到下一个 VC 及以后。
但是当我再次选择Home选项卡
时,我希望Class选项卡
返回到RootViewController
我已尝试以下方法,但不起作用。每次下一个 VC
消失时,它都会继续弹出到 RootViewController
。
-(void) viewWillDisappear:(BOOL)animated {
[self.navigationController popViewControllerAnimated:YES];
[super viewWillDisappear:animated];
}
我有以下代码 MyTabBarController,它是由一位堆栈溢出专家给我的,但不确定每次选择新的 TabBarController
时在哪里调整以返回 RootViewController Class.m 选项卡。请帮忙。
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {
NSLog(@"didSelectViewController... ");
//==== Tried this but not triggering =====
//[(UINavigationController *)viewController popToRootViewControllerAnimated:NO];
//if ([viewController isKindOfClass:[UINavigationController class]]) {
//[self.navigationController popViewControllerAnimated:YES];
//}
//==========================================
NSLog(@"controller class: %@", NSStringFromClass([viewController class]));
NSLog(@"controller title: %@", viewController.title);
if ([viewController isKindOfClass:[UINavigationController class]]) {
// we're expecting a nav controller so cast it to a nav here
UINavigationController *navController = (UINavigationController *)viewController;
// now grab the first view controller from that nav controller
UIViewController *firstViewControllerInNav = navController.viewControllers.firstObject;
// check to make sure it's what we're expecting (ParentViewController)
if ([firstViewControllerInNav isKindOfClass:[ParentViewController class]]) {
// cast it to our parent view controller class
[(UINavigationController *)viewController popToRootViewControllerAnimated:NO];
ParentViewController *viewControllerToCallMethodOnAfterSelection = (ParentViewController *)firstViewControllerInNav;
[viewControllerToCallMethodOnAfterSelection doStuffWhenTabBarControllerSelects];
}else{
//=== The following code will make viewWillAppear load on each tab bar item
//=== Without it, tapping on new tab bar item will not load viewWillAppear
[(UINavigationController *)viewController popToRootViewControllerAnimated:NO];
}
}
}
添加了以下代码,它确实会触发,但不会将 selectedIndex = 2 返回到根目录
-(BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {
NSUInteger shouldSelectIndex = [tabBarController.viewControllers indexOfObject:viewController];
//Check if current index is Class tab and new index is Home
if (tabBarController.selectedIndex == 2 && shouldSelectIndex == 0) {
[self.navigationController popViewControllerAnimated:YES];
//[(UINavigationController *)viewController popToRootViewControllerAnimated:NO];
//[tabBarController.viewControllers objectAtIndex:tabBarController.selectedIndex];
}
return YES;
}
添加 Storyboard
添加文件结构
最佳答案
在 tabbarController 中创建一个方法,并在您希望类选项卡访问其 Root View Controller 时调用此方法
-(void)popToClassRootViewController{
// Considering the fact that class view contorller will always be on 3 no and will be of UINavigationController
UINavigationController *classNavController = (UINavigationController *)[self.viewControllers objectAtIndex:2];
// You can get the navigation controller reference by any way you prefer
[classNavController popToRootViewControllerAnimated:false];
}
在您的情况下,我认为您希望在单击其他选项卡时重置 View Controller ,以便您可以使用选项卡栏委托(delegate)方法来检查其他选项卡栏项目是否被单击并调用该方法
- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {
NSUInteger index = [tabBarController.viewControllers indexOfObject:viewController];
if (index != 2) {
//Note: Call this method according to your need in this case it will be called whenever user will select tab other then Class
[self popToClassRootViewController];
}
return true;
}
关于ios - ObjC 如何在选择 TabBarItem 时弹出回 RootViewController,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54682636/