如何从导航控制器一次弹出两个视图？

Question

我想弹出导航堆栈上的第三个视图回到第一个视图.

我知道如何一次弹出一个视图:

[self.navigationController popViewControllerAnimated:YES];

但我怎么一次做两个呢？

谢谢...

Answer 1

您也可以尝试在导航控制器堆栈之间跳转

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

以下是两个UINavigationController可以解决您问题的扩展.我建议使用弹出UIViewController特定类的第一个:

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)
    }
  }

}

并像这样使用它:

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

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

Answer 3

您可以使用以下命令弹出"root"(第一个)视图控制器popToRootViewControllerAnimated:

[self.navigationController popToRootViewControllerAnimated:YES];

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

UINavigationController参考:

弹出除根视图控制器之外的堆栈上的所有视图控制器并更新显示.

返回值
从堆栈弹出的视图控制器数组.

Answer 4

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

objectAtIndex:1 - >您可以传递要弹出的索引

Answer 5

Swift 2 - xCode 7.3

这可能是弹出UIViewControllers的一个非常有用的扩展:

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

如果你只是想一次弹出2,因为你的rootViewController是"更深",那么你可以考虑在UIviewController中添加一个类别,例如:

UINavigationController的+ popTwice.h

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

- (void) popTwoViewControllersAnimated:(BOOL)animated;

@end

UINavigationController的+ popTwice.m

#import "UINavigationController+popTwice.h"

@implementation UINavigationController (popTwice)

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

@end

#import "UINavigationController+popTwice.h"在实现中的某处导入类别,并使用以下代码行一次弹出2个控制器:

[self.navigationController popTwoViewControllersAnimated:YES];

那不是很好吗？:)

Answer 7

你也可以尝试这个: -

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

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

斯威夫特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)
    }
}

然后使用此方法

self.popViewControllerss(popViews: 2)