如何处理导航后退按钮视图层次结构？

Question

Here is the problem

1) Rootview controller - MYAssetVC-> Embedded with NavigationController here pushing for button to another Addfilevc.

2) Addfilevc Has dropdownTextfield It will push to another vc have tableview selected row will display in the textfield.

3)if i select another value from the dropdown textfield it will push to the vc again there i will select.

Navigation bar back button will navigate to all my view hierarchy i want to handle this one. if i go to same view it should navigate back only once that to the recent visit how to do this.

As i am new to iOS. give any suggestion.

Navigation from 1->2->3

navigation backbtn 3->2->1

if i navigate like this 1->2->3-> backbutton 3->2 again 2->3 backbutton 3->2 again 2->3

IF i navigate now using back it is displaying all my route path it should navigate like 1->2->3> and 3->2->1 if any number of times i perform actions in 2 & 3.

1,2,3 are view controllers.

Answer 1

Create an IBAction for the back button and use popViewController.

[self.navigationController popViewControllerAnimated:YES];

This will help you to go back one page. You have to write this in all the pages where there is a back button and you want to go back one page.

If you want to go back directly to rootViewController, try this:

[self.navigationController popToRootViewControllerAnimated:YES];

And if you want to pop to any specific viewController in the stack, you run a for loop to find the viewController you want to navigate to and then simply popToViewController, like this:

for (UIViewController *viewController in self.navigationController.viewControllers) {
    if ([viewController isKindOfClass:[Addfilevc class]]) {
        [self.navigationController popToViewController:viewController animated:YES];
    }
}

Hope this helps to clear your concept.

EDIT

In swift:

• The [self.navigationController popViewControllerAnimated:YES]; will become self.navigationController?.popViewControllerAnimated(true)

• The [self.navigationController popToRootViewControllerAnimated:YES]; will become navigationController?.popToRootViewControllerAnimated(true)

• And the for loop will be as below:

You can use this if you are using storyboard

let switchViewController = self.storyboard?.instantiateViewControllerWithIdentifier("view2") as ComposeViewController

self.navigationController?.pushViewController(switchViewController, animated: true)

And the for-in loop

if let viewControllers = self.navigationController?.viewControllers {
    for viewController in viewControllers {
        self.navigationController!.popToViewController(viewController, animated: true);
    } 
}

Thanks.