如何從導航控制器ios中刪除以前的視圖控制器？

Question

我想從導航堆棧中刪除以前的視圖控制器。

例如

- > A是根view.now導航到B - B導航到c - c瀏覽到c ​​- c瀏覽到c

- >現在我想刪除所有的C視圖控制器&彈出到B

B未修正視圖控制器。

又如

甲 - >乙 - > C>克> C>˚F> C> C> C> c^

取下導航&需要所有C查看控制器以下輸出

A - >乙 - > C> g>的C>˚F

請幫我

Answer 1

您可以使用popToViewController（https://developer.apple.com/documentation/uikit/uinavigationcontroller/1621871-poptoviewcontroller）。

例如：

在目標C

[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 

在夫特3

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

Answer 2

確定從導航堆棧控制器。和POP到控制器

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; 
     } 
    } 

Answer 3

反向疊代導航堆棧並獲得第一個非匹配的viewController的索引，然後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) 
} 

Answer 4

寫方法類似於以下，

- (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; 
} 

Answer 5

由於navigationController的childViewControllers是一個堆棧，
所以使用此功能，您可以彈出到f viewController和「c> c> c> c」被銷燬。

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

但是，如果你不想彈出到f，只想獲取navigationController的新的childViewControllers。您可以使用下一個功能：

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)]; 
    } 
} 

的viewArray是新childViewControllers.And如果你有新的需求，可以編輯該功能，然後使用它。