如何从一个视图控制器弹出到另一个视图控制器

Question

使用iOS我现在有15个ViewControllers我想从一个ViewController弹出到另一个View Controller。

我正在使用此代码：

SecondViewController *Sec=[SecondViewController alloc]init];
[self.navigationController popViewController:Sec animated:YES];

这显示错误this ViewController not exist然后我使用此代码：

NSArray *array = [self.navigationController viewControllers];
[self.navigationController popToViewController:[array objectAtIndex:1] animated:YES];

此代码适用于从thirdViewController弹出到secondViewController。但是当我们从第九个（第9个）ViewController弹出到第五个（第五个）ViewController然后我在第九个（第9个）ViewController中使用这个代码时发生了什么：

NSArray *array = [self.navigationController viewControllers];
[self.navigationController popToViewController:[array objectAtIndex:4] animated:YES];

它不会从Ninth（第9个）ViewController弹出到第五个（第五个）ViewController，它会将第九个（第9个）ViewController弹出到第八个（第8个）ViewController。我不知道当我们使用这条线时发生了什么：

NSArray *array = [self.navigationController viewControllers];
NsLog(@"array = %@",array);

当我们在Ninth(9th)ViewController中使用它时。 NsLog显示：

array=   First(1st)ViewController;  
         Second(2nd)ViewController;
         Eight(8th)ViewController;
         Ninth(9th)ViewController;

我不知道为什么只有四个视图控制器显示。每当我使用15个视图控制器时。每个视图控制器中都会出现此问题。例如，如果我使用pop形式第十五（15）ViewController到Fifth（5th）ViewController然后相同的问题清单。

NSArray *array = [self.navigationController viewControllers];
NsLog(@"array = %@",array);

array=     First(1st)ViewController;  
           Second(2nd)ViewController;
           fourteenth(14th)ViewController;
           fifteenth(15th)ViewController;

我想计算ViewControllers的数量，然后弹出到特定的ViewController。

Answer 1

Swift 4.0 - Swift 5.0

 for controller in self.navigationController!.viewControllers as Array {
            if controller.isKind(of: HomeViewController.self) {
                self.navigationController!.popToViewController(controller, animated: true)
                break
            }
        }

Answer 2

您无法弹出到新的视图控制器（就像使用secondViewController示例一样）。

当你使用UINavigationController时

将Controller添加到堆栈中：

[self.navigationController pushViewController:<yournewViewController> animated:YES];

弹出到上一个：

[self.navigationController popViewControllerAnimated:YES];

弹出到堆栈中的前一个控制器（必须先被推送）：

[self.navigationController popToViewController:<ViewControllerToPopTo> animated:YES];

返回到根控制器

[self.navigationController popToRootViewControllerAnimated:YES];

Answer 3

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

                break;
            }
        }

Answer 4

试试这个

 [self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:0] animated:YES];

Answer 5

第一：

 SecondViewController *Sec=[SecondViewController alloc]init];
 [self.navigationController popViewController:Sec animated:YES];

您无法执行此操作，因为您分配了一个不在导航控制器中的新Sec视图控制器。

考虑使用这个：

你在9视图控制器

for (int i= 0 ; i < [[self.navigationController viewControllers]count] ; i++) {
    if ( [[[self.navigationController viewControllers] objectAtIndex:i] isKindOfClass:[FifiViewControllerClassname class]]) {
        [self.navigationController popToViewController:[array objectAtIndex:i] animated:YES];
    }
}

Answer 6

试试这样吧

MyTableViewController *vc = [[MyTableViewController alloc] init];
NSMutableArray *controllers = [NSMutableArray    
arrayWithArray:self.navigationController.viewControllers];
[controllers removeLastObject];
[controllers addObject:vc]; 

Answer 7

BOOL check = FALSE;
NSArray *viewControllers = [[self navigationController] viewControllers];
id obj;
for( int i=0;i<[viewControllers count];i++)
{
    obj=[viewControllers objectAtIndex:i];
    if([obj isKindOfClass:[yourclassname class]])
    {
        check = TRUE;
        break;
    }
}

if (check)
{

    [[self navigationController] popToViewController:obj animated:YES];
}
else
{
    yourclassname *yourclassnameObj=[self.storyboard instantiateViewControllerWithIdentifier:@"yourclassStoryBoardID"];
    [self.navigationController pushViewController:yourclassnameObj animated:true];

}

Answer 8

对于Swift 3.0，请使用过滤器：

let desiredViewController = self.navigationController!.viewControllers.filter { $0 is YourViewController }.first!
self.navigationController!.popToViewController(desiredViewController, animated: true)