弹出根目录，然后在iPhone上执行序列 [英] Pop to root then perform segue on iPhone

问题描述

我正在iOS 6.0情节提要板上运行

I am running on iOS 6.0 storyboard enabled

我有一个链接到TableViewController的NavController.这个TableView可以选择AViewController或BViewController.

I have a NavController linked to a TableViewController. This TableView can segue to AViewController or BViewController.

当我在A中时，我想弹出到根目录，并使用此行对B执行segue:

When I am in A, I want to pop back to the root and perform segue to B with this line :

UINavigationController *nav = self.navigationController;
[nav popToRootViewControllerAnimated:YES];
[nav performSegueWithIdentifier:@"GoToB" sender:self];

我检查了情节提要，GoToB确实存在并且从TableViewController链接到BViewController

I checked the storyboard, GoToB do exist and is linked from the TableViewController to BViewController

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Receiver (<NavMainViewController: 0xb921fa0>) has no segue with identifier 'GoToB''

我想念什么?

推荐答案

segue将附加到您弹出的视图控制器，而不是包含在其中的容器视图控制器 nav .因此，这将更加接近:

The segue will be attached to the view controller you pop to, not nav which is the container view controller that contains it. So this would be closer:

UINavigationController *nav = self.navigationController;
[nav popToRootViewControllerAnimated:YES];

UIViewController *rootVC = [nav.viewControllers objectAtIndex:0];
[rootVC performSegueWithIdentifier:@"GoToB" sender:self];

但是，我认为这里的问题将是流行动画将与segue冲突.使用... Animated:NO进行弹出可能会解决它，但我认为从rootVC执行segue会更正确(对于动画来说更健壮).

But, I think the problem here will be that the pop animation will conflict with the segue. Doing the pop with ...Animated:NO might fix it, but I think it would be more correct (and more robust for animations) to perform the segue from the rootVC.

rootVC将按如下方式实现viewDidAppear:

rootVC would implement viewDidAppear as follows:

- (void)viewDidAppear:(BOOL)animated {

    [super viewDidAppear:animated];
    if (!self.isBeingPresented && /* any other condition that makes you want this */) {
        [self performSegueWithIdentifier:@"GoToB" sender:self];
    }
}

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