如何从导航控制器一次弹出两个视图？

Question

I want to pop to the third view on the navigation stack back to the first view.

I know how to pop one view at once:

[self.navigationController popViewControllerAnimated:YES];

But how do I do two at once?

Answer 1

You can try this to Jump between the navigation controller stack as well

NSMutableArray *allViewControllers = [NSMutableArray arrayWithArray:[self.navigationController viewControllers]];
for (UIViewController *aViewController in allViewControllers) {
    if ([aViewController isKindOfClass:[RequiredViewController class]]) {
        [self.navigationController popToViewController:aViewController animated:NO];
    }
}

Answer 2

Here are two UINavigationController extensions that can solve your problem. I would recommend using the first one that pops to a UIViewController of a specific class:

extension UINavigationController {

  func popToViewController(ofClass: AnyClass, animated: Bool = true) {
    if let vc = viewControllers.filter({$0.isKind(of: ofClass)}).last {
      popToViewController(vc, animated: animated)
    }
  }

  func popViewControllers(viewsToPop: Int, animated: Bool = true) {
    if viewControllers.count > viewsToPop {
      let vc = viewControllers[viewControllers.count - viewsToPop - 1]
      popToViewController(vc, animated: animated)
    }
  }

}

and use it like this:

// pop to SomeViewController class
navigationController?.popToViewController(ofClass: SomeViewController.self)

// pop 2 view controllers
navigationController?.popViewControllers(viewsToPop: 2)

Answer 3

You can pop to the "root" (first) view controller with popToRootViewControllerAnimated :

[self.navigationController popToRootViewControllerAnimated:YES];

// If you want to know what view controllers were popd:
// NSArray *popdViewControllers = [self.navigationController popToRootViewControllerAnimated:YES];

UINavigationController Reference :

Pops all the view controllers on the stack except the root view controller and updates the display.

Return Value
An array of view controllers that are popped from the stack.

Answer 4

[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:1] animated:YES];   

objectAtIndex:1 --> 你可以传递你想要弹出的任何索引

Answer 5

Swift 2 - xCode 7.3

This could be a very useful extension to pop UIViewControllers:

extension UINavigationController {

    func popToViewControllerOfType(classForCoder: AnyClass) {
        for controller in viewControllers {
            if controller.classForCoder == classForCoder {
                popToViewController(controller, animated: true)
                break
            }
        }
    }

    func popViewControllers(controllersToPop: Int, animated: Bool) {
        if viewControllers.count > controllersToPop {
            popToViewController(viewControllers[viewControllers.count - (controllersToPop + 1)], animated: animated)
        } else {
            print("Trying to pop \(controllersToPop) view controllers but navigation controller contains only \(viewControllers.count) controllers in stack")
        }
    }
}

Answer 6

If you just want to pop 2 at once because your rootViewController is (way) 'deeper' then 2 you could consider adding a category to UIviewController for example:

UINavigationController+popTwice.h

#import <UIKit/UIKit.h>
@interface UINavigationController (popTwice)

- (void) popTwoViewControllersAnimated:(BOOL)animated;

@end

UINavigationController+popTwice.m

#import "UINavigationController+popTwice.h"

@implementation UINavigationController (popTwice)

- (void) popTwoViewControllersAnimated:(BOOL)animated{
    [self popViewControllerAnimated:NO];
    [self popViewControllerAnimated:animated];
}

@end

Import the category #import "UINavigationController+popTwice.h" somewhere in your implementation and use this line of code to pop 2 controllers at once:

[self.navigationController popTwoViewControllersAnimated:YES];

isn't that great? :)

Answer 7

Swift 4 :

func popViewControllerss(popViews: Int, animated: Bool = true) {
    if self.navigationController!.viewControllers.count > popViews
    {
        let vc = self.navigationController!.viewControllers[self.navigationController!.viewControllers.count - popViews - 1]
         self.navigationController?.popToViewController(vc, animated: animated)
    }
}

Then Use This Method

self.popViewControllerss(popViews: 2)

Answer 8

//viewIndex = 1;
//viewIndex = 2;
//viewIndex = 3;

// **[viewControllers objectAtIndex: *put here your viewindex number*]

NSArray *viewControllers = [self.navigationController viewControllers];
[self.navigationController popToViewController:[viewControllers objectAtIndex:viewIndex] animated:NO];

Answer 9

你也可以试试这个：-

[self.navigationController popToViewController:yourViewController animated:YES];

Answer 10

    NSMutableArray *newStack = [NSMutableArray arrayWithArray:[self.navigationController viewControllers]];
    [newStack removeLastObject];
    [newStack removeLastObject];
    [self.navigationController setViewControllers:newStack animated:YES];

Answer 11

In Swift 3 , you can pop one, two or more viewcontrollers from navigation controller like that

let viewControllers = self.navigationController!.viewControllers as [UIViewController]
    for aViewController:UIViewController in viewControllers {
        if aViewController.isKind(of: FromWhereYouWantToGoController.self) {
            _ = self.navigationController?.popToViewController(aViewController, animated: true)
        }
    }

Here FromWhereYouWantToGoController is destination controller. Hope it helps.

Answer 12

You can pass the initial view controller (the one you want to come back to) and then call this line in the last view:

[self.navigationController popToViewController:yourInitialViewController animated:YES];

L.

Answer 13

I didn't see this answer in here. If you only want to pop a few (not all the way to the root), you can just iterate through self.navigationController.viewControllers checking for class types, or if you have a reference use that:

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

Answer 14

Here's a little function I'm using to go back X ViewControllers:

-(void)backMultiple:(id)data {
    int back = 2; //Default to go back 2 
    int count = [self.navigationController.viewControllers count];

    if(data[@"count"]) back = [data[@"count"] intValue];

    //If we want to go back more than those that actually exist, just go to the root
    if(back+1 > count) {
        [self.navigationController popToRootViewControllerAnimated:YES];
    }
    //Otherwise go back X ViewControllers 
    else {
        [self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:count-(back+1)] animated:YES];
    }
}

Answer 15

Swift Version as of (Swift 1.2 / Xcode 6.3.1) of popping twice or more

 var viewControllers = self.navigationController?.viewControllers
 viewControllers?.removeLast()
 viewControllers?.removeLast()
 self.navigationController?.setViewControllers(viewControllers, animated: true)

or

 var viewControllers = self.navigationController?.viewControllers
 var viewsToPop = 2
 var end = (viewControllers?.count)!
 var start = end - viewsToPop
 viewControllers?.removeRange(Range<Int>(start: start, end: end))
 self.navigationController?.setViewControllers(viewControllers, animated: true)

Answer 16

you can pop back to the root view controller

[self.navigationController popToRootViewControllerAnimated:YES];

or, if the view you want to pop to isn't the first one, you'll need to pop again in your previous view's viewWillAppear

Answer 17

You can use the stack of the UIViewControllers. 1. Fetch the array of all the viewControllers in the stack. 2. Iterate through the whole array and find the desired viewController
by matching the class type. 3. Pop the viewController.

func popToSpecificViewC
{
let viewControllers: [UIViewController] = self.navigationController!.viewControllers as [UIViewController];
        for viewController:UIViewController in viewControllers
        {
            if viewController.isKind(of: WelcomeViewC.self)
            {
                _ = self.navigationController?.popToViewController(viewController, animated: true)
            }
        }
}

Answer 18

Using a simple UINavigationController extension :

extension UINavigationController {
    func popViewControllers(_ count: Int) {
        guard viewControllers.count > count else { return }
        popToViewController(viewControllers[viewControllers.count - count - 1], animated: true)
    }
}

Answer 19

Swift 4.2

On your navigationController?.viewControllers you can check your viewControllers on your navigation controller, so then you just need to pop the position you want to, just like that:

navigationController?.popToViewController(navigationController?.viewControllers[1], animated: true)

Where 1 is the position of my ViewController that I want to pop out.