从另一个选项卡调用 popToRootViewController

问题描述

我有使用情节提要的带有导航控制器应用程序的标签栏，
我的目的是在 tab3 中按下一个按钮，在后台我希望 tab1 为popToRootViewController"

I have tab bar with navigation controller app using storyboard ,
my purpose is to press a button in tab3 and in the background I want tab1 to "popToRootViewController"

tab3 视图控制器中的按钮:

the button in tab3 viewcontroller:

- (IBAction)Action:(id)sender {

    vc1 * first = [[vc1 alloc]init];
    [first performSelector:@selector(popToRootViewController) withObject:Nil];

}

tab1 viewcontroller 中的代码

the code in the tab1 viewcontroller

-(void)popToRootViewController{

    [self.navigationController popToRootViewControllerAnimated:NO];
    NSLog(@"popToRootViewController");
}

我在日志中得到了 popToRootViewController，但操作没有执行.

I get the popToRootViewController in logs, but the action didn't perform.

解决问题:

- (IBAction)Action:(id)sender {

        [[self.tabBarController.viewControllers objectAtIndex:0]popToRootViewControllerAnimated:NO];


    }

推荐答案

你的做法:

vc1 * first = [[vc1 alloc]init];
[first performSelector:@selector(popToRootViewController) withObject:Nil];

不正确.事实上，您在这里创建了一个全新的控制器，完全独立于您现有的控制器，不属于任何导航控制器.因此，self.navigationController 在 popToRootViewController 中是 nil.

is not correct. Indeed, you are creating a whole new controller here, completely independent from your existing controllers and not belonging to any navigation controller. For this reason, self.navigationController is nil in popToRootViewController.

您可以尝试执行以下操作:

You might try doing something like:

 //-- this will give you the left-most controller in your tab bar controller
 vc1 * first = [self.tabBarController.viewControllers objectAtIndex:0];
[first performSelector:@selector(popToRootViewController) withObject:Nil];

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