如何从导航控制器ios中删除以前的视图控制器？

我想从导航堆栈中删除以前的视图控制器

比如说

->A是根视图。现在导航到B-B导航到c-c导航到c-c导航到c

-->现在我想删除所有c视图控制器&弹出到B

B不是固定视图控制器

另一个例子 A->b->c>g>c>f>c>c>c>c>c

从导航中删除所有c视图控制器&需要以下输出

A->b->c>g>c>f

---

请帮助我您可以使用

popToViewController

（）

例如：

在目标C中

[self.navigationController popToViewController:self.navigationController.viewControllers[your_VC_index] animated: true]; 
// in first eg your_VC_index will be 1 and another example it will be 5

斯威夫特3

self.navigationController.popToViewController( self.navigationController.viewControllers[your_VC_index], animated: true)

---

您可以使用

popToViewController

（）

例如：

在目标C中

[self.navigationController popToViewController:self.navigationController.viewControllers[your_VC_index] animated: true]; 
// in first eg your_VC_index will be 1 and another example it will be 5

斯威夫特3

self.navigationController.popToViewController( self.navigationController.viewControllers[your_VC_index], animated: true)

---

从导航堆栈中识别控制器。然后跳到那个控制器

  NSArray *viewControllers = [[self navigationController] viewControllers];
  int count = [viewControllers count];

  for (int i= count-2; i >= 0 ; i--) {

        id obj=[viewControllers objectAtIndex:i];

        if(![obj isKindOfClass:[C class]]){
           [[self navigationController] popToViewController:obj animated:YES];
            return;
        }
   }

---

从导航堆栈中识别控制器。然后跳到那个控制器

  NSArray *viewControllers = [[self navigationController] viewControllers];
  int count = [viewControllers count];

  for (int i= count-2; i >= 0 ; i--) {

        id obj=[viewControllers objectAtIndex:i];

        if(![obj isKindOfClass:[C class]]){
           [[self navigationController] popToViewController:obj animated:YES];
            return;
        }
   }

---

反向迭代导航堆栈，获取第一个不匹配的viewController的索引，然后是popToViewController

if let controllers = self.navigationController?.viewControllers {
   var count = controllers.count - 1
   for viewcontroller in controllers.reversed() {
       if viewcontroller is CViewController {
          count -= 1
       } else {
          break
       }
    }

    let vc = controllers[count]
    self.navigationController?.popToViewController(vc, animated: true)
 }

---

反向迭代导航堆栈，获取第一个不匹配的viewController的索引，然后是popToViewController

if let controllers = self.navigationController?.viewControllers {
   var count = controllers.count - 1
   for viewcontroller in controllers.reversed() {
       if viewcontroller is CViewController {
          count -= 1
       } else {
          break
       }
    }

    let vc = controllers[count]
    self.navigationController?.popToViewController(vc, animated: true)
 }

---

写一个方法，如下所示

- (void)removeAllLastCObjectsFromNavigationController {
    //fetch viewcontroller array. for your case which will be A - > b -> c > g > c > f > c > c > c > c
    NSArray *viewControllers = yourNavigationController.viewControllers;
    NSMutableArray *mutableArray = [NSMutableArray arrayWithArray: viewControllers];

    while(1) {
        id viewController = mutableArray.lastObject;
        if ([viewController isKindOfClass:[YourCClassName class]]) {
            //Now continue removing the objects from the array if that is C type object.
            [mutableArray removeLastObject];
        } else {
            //If found any other class than C stop removing viewcontroller
            break;
        }
    }
    //Now mutableArray contains A - > b -> c > g > c > f
    yourNavigationController.viewControllers = mutableArray;
}

---

写一个方法，如下所示

- (void)removeAllLastCObjectsFromNavigationController {
    //fetch viewcontroller array. for your case which will be A - > b -> c > g > c > f > c > c > c > c
    NSArray *viewControllers = yourNavigationController.viewControllers;
    NSMutableArray *mutableArray = [NSMutableArray arrayWithArray: viewControllers];

    while(1) {
        id viewController = mutableArray.lastObject;
        if ([viewController isKindOfClass:[YourCClassName class]]) {
            //Now continue removing the objects from the array if that is C type object.
            [mutableArray removeLastObject];
        } else {
            //If found any other class than C stop removing viewcontroller
            break;
        }
    }
    //Now mutableArray contains A - > b -> c > g > c > f
    yourNavigationController.viewControllers = mutableArray;
}

---

因为navigationController的ChildViewController是一个堆栈，
因此，使用此函数，您可以弹出到f viewController，并且“c>c>c>c”被销毁

for (UIViewController *tempVC in self.navigationController.childViewControllers) {
    if ([tempVC isKindOfClass:[fViewController class]]) {
        fViewController *f = (fViewController *)tempVC;
        [self.navigationController popToViewController:f animated:YES];
    }
}

但是，如果您不想弹出到f，只想获得navigationController的新ChildViewController。您可以使用以下功能：

for (UIViewController *tempVC in self.navigationController.childViewControllers) {
    if ([tempVC isKindOfClass:[ScanViewController class]]) {
        NSUInteger findex = [self.navigationController.childViewControllers indexOfObject:tempVC];
        NSMutableArray *viewArray = [NSMutableArray arrayWithArray:self.navigationController.childViewControllers];
        [viewArray removeObjectsInRange:NSMakeRange(findex, viewArray.count - 1)];
    }
}

---

viewArray是新的ChildViewController。如果您有新的需求，可以编辑此函数，然后使用它。

因为navigationController的ChildViewController是一个堆栈，
因此，使用此函数，您可以弹出到f viewController，并且“c>c>c>c”被销毁

for (UIViewController *tempVC in self.navigationController.childViewControllers) {
    if ([tempVC isKindOfClass:[fViewController class]]) {
        fViewController *f = (fViewController *)tempVC;
        [self.navigationController popToViewController:f animated:YES];
    }
}

但是，如果您不想弹出到f，只想获得navigationController的新ChildViewController。您可以使用以下功能：

for (UIViewController *tempVC in self.navigationController.childViewControllers) {
    if ([tempVC isKindOfClass:[ScanViewController class]]) {
        NSUInteger findex = [self.navigationController.childViewControllers indexOfObject:tempVC];
        NSMutableArray *viewArray = [NSMutableArray arrayWithArray:self.navigationController.childViewControllers];
        [viewArray removeObjectsInRange:NSMakeRange(findex, viewArray.count - 1)];
    }
}

---

viewArray是新的ChildViewController。如果您有新的需求，可以编辑此函数，然后使用它。

这可能会对您有所帮助：我已经检查过了。但无法工作我不理解的是，您如何从c导航到c。>A->b->c>g>c>f>c>c>c这可能会对你有所帮助：我已经检查过了。但是没有工作。我不明白的是，你怎么能从c导航到cA->b->c>g>c>f>c>c>c>cit将通过在导航堆栈中传递上面的所有视图控制器，转到第一个不匹配的viewcontroller是的，这就是他想要的。。检查他的示例@suhit导航堆栈是'A->b->c>g>c>f>c>c>c'所需的输出是'A->b->c>g>c>f'，您的解决方案将显示ViewController-A，因为它将在第一次索引时停止。@suhit感谢您提供的信息。。我刚刚更新了答案。通过在导航堆栈中传递上面的所有视图控制器，它将转到第一个不匹配的viewcontroller是的，这就是他想要的。。检查他的示例@suhit导航堆栈是'A->b->c>g>c>f>c>c>c'所需的输出是'A->b->c>g>c>f'，您的解决方案将显示ViewController-A，因为它将在第一次索引时停止。@suhit感谢您提供的信息。。我刚刚更新了答案。