Question

我有一个导航堆栈，比如5个UIViewControllers。我想在第5个viewcontroller中单击按钮时删除堆栈中的第3个和第4个viewcontrollers。是否有可能做到这一点？如果是这样的话？

Answer 1

使用此代码并享受：

NSMutableArray *navigationArray = [[NSMutableArray alloc] initWithArray: self.navigationController.viewControllers];

// [navigationArray removeAllObjects];    // This is just for remove all view controller from navigation stack.
[navigationArray removeObjectAtIndex: 2];  // You can pass your index here
self.navigationController.viewControllers = navigationArray;
[navigationArray release];

希望这会对你有所帮助。

编辑：Swift代码

var navigationArray = self.navigationController?.viewControllers //To get all UIViewController stack as Array
navigationArray!.remove(at: (navigationArray?.count)! - 2) // To remove previous UIViewController
self.navigationController?.viewControllers = navigationArray!

Answer 2

您可以先获取阵列中的所有视图控制器，然后在使用相应的视图控制器类进行检查后，可以删除所需的视图控制器。

这是一小段代码：

NSArray* tempVCA = [self.navigationController viewControllers];

for(UIViewController *tempVC in tempVCA)
{
    if([tempVC isKindOfClass:[urViewControllerClass class]])
    {
        [tempVC removeFromParentViewController];
    }
}

我认为这会让您的工作更轻松。

Answer 3

Swift 3＆amp; 4

self.navigationController!.viewControllers.removeAll()

self.navigationController?.viewControllers.remove(at: "insert here a number")

Swift 2.1

删除全部：

self.navigationController!.viewControllers.removeAll()

删除索引

self.navigationController?.viewControllers.removeAtIndex("insert here a number")

还有很多可能的动作，比如removeFirst，range等。

Answer 4

Swift 2.0：

  var navArray:Array = (self.navigationController?.viewControllers)!
  navArray.removeAtIndex(navArray.count-2)
  self.navigationController?.viewControllers = navArray

Answer 5

使用setViewControllers中的UINavigationController函数是最好的方法。还有animated参数可启用动画。

func setViewControllers(_ viewControllers: [UIViewController], animated: Bool)

迅速问问题的例子

func goToFifthVC() {

    var currentVCStack = self.navigationController?.viewControllers
    currentVCStack?.removeSubrange(2...3)

    let fifthVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "fifthVC")
    currentVCStack?.append(fifthVC)

    self.navigationController?.setViewControllers(currentVCStack!, animated: true)
}

我尝试了其他方式，例如[tempVC removeFromParentViewController];。它产生了怪异的行为，删除了ViewController导航，当弹出时仍显示如@ robin-ellerkmann所报告的那样

Answer 6

如果您尝试从第5个视图控制器移动到第2个视图控制器（跳过第3个和第4个），您可以使用[self.navigationController popToviewController:secondViewController]。

您可以从导航控制器堆栈中获取secondViewController。

secondViewController =  [self.navigationController.viewControllers objectAtIndex:yourViewControllerIndex];

Answer 7

使用此

if let navVCsCount = navigationController?.viewControllers.count {
    navigationController?.viewControllers.removeSubrange(Range(2..<navVCsCount - 1))
}

它将处理navigationController的ViewControllers。 viewControllers以及在navigationBar中堆叠的navigationItem。

注意：请务必在viewDidAppear

之后至少调用它

Answer 8

Swift 5，Xcode 11.1

通过指定要从导航堆栈中删除的视图控制器，我发现这种方法很简单。

extension UINavigationController {

func removeViewController(_ controller: UIViewController.Type) {
    if let viewController = viewControllers.first(where: { $0.isKind(of: controller.self) }) {
        viewController.removeFromParent()
    }
}

}

示例用法：

navigationController.removeViewController(YourViewController.self)

Answer 9

详细信息

Swift 5.1，Xcode 11.3.1

解决方案

extension UIViewController {
    func removeFromNavigationController() { navigationController?.removeController(.last) { self == $0 } }
}

extension UINavigationController {
    enum ViewControllerPosition { case first, last }
    enum ViewControllersGroupPosition { case first, last, all }

    func removeController(_ position: ViewControllerPosition, animated: Bool = true,
                          where closure: (UIViewController) -> Bool) {
        var index: Int?
        switch position {
            case .first: index = viewControllers.firstIndex(where: closure)
            case .last: index = viewControllers.lastIndex(where: closure)
        }
        if let index = index { removeControllers(animated: animated, in: Range(index...index)) }
    }

    func removeControllers(_ position: ViewControllersGroupPosition, animated: Bool = true,
                           where closure: (UIViewController) -> Bool) {
        var range: Range<Int>?
        switch position {
            case .first: range = viewControllers.firstRange(where: closure)
            case .last:
                guard let _range = viewControllers.reversed().firstRange(where: closure) else { return }
                let count = viewControllers.count - 1
                range = .init(uncheckedBounds: (lower: count - _range.min()!, upper: count - _range.max()!))
            case .all:
                let viewControllers = self.viewControllers.filter { !closure($0) }
                setViewControllers(viewControllers, animated: animated)
                return
        }
        if let range = range { removeControllers(animated: animated, in: range) }
    }

    func removeControllers(animated: Bool = true, in range: Range<Int>) {
        var viewControllers = self.viewControllers
        viewControllers.removeSubrange(range)
        setViewControllers(viewControllers, animated: animated)
    }

    func removeControllers(animated: Bool = true, in range: ClosedRange<Int>) {
        removeControllers(animated: animated, in: Range(range))
    }
}

private extension Array {
    func firstRange(where closure: (Element) -> Bool) -> Range<Int>? {
        guard var index = firstIndex(where: closure) else { return nil }
        var indexes = [Int]()
        while index < count && closure(self[index]) {
            indexes.append(index)
            index += 1
        }
        if indexes.isEmpty { return nil }
        return Range<Int>(indexes.min()!...indexes.max()!)
    }
}

用法

removeFromParent()

navigationController?.removeControllers(in: 1...3)

navigationController?.removeController(.first) { $0 != self }

navigationController?.removeController(.last) { $0 != self }

navigationController?.removeControllers(.all) { $0.isKind(of: ViewController.self) }

navigationController?.removeControllers(.first) { !$0.isKind(of: ViewController.self) }

navigationController?.removeControllers(.last) { $0 != self }

完整样本

别忘了在此处粘贴解决方案代码

import UIKit

class ViewController2: ViewController {}

class ViewController: UIViewController {

    private var tag: Int = 0
    deinit { print("____ DEINITED: \(self), tag: \(tag)" ) }

    override func viewDidLoad() {
        super.viewDidLoad()
        print("____ INITED: \(self)")
        let stackView = UIStackView()
        stackView.axis = .vertical
        view.addSubview(stackView)
        stackView.translatesAutoresizingMaskIntoConstraints = false
        stackView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
        stackView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true

        stackView.addArrangedSubview(createButton(text: "Push ViewController() white", selector: #selector(pushWhiteViewController)))
        stackView.addArrangedSubview(createButton(text: "Push ViewController() gray", selector: #selector(pushGrayViewController)))
        stackView.addArrangedSubview(createButton(text: "Push ViewController2() green", selector: #selector(pushController2)))
        stackView.addArrangedSubview(createButton(text: "Push & remove previous VC", selector: #selector(pushViewControllerAndRemovePrevious)))
        stackView.addArrangedSubview(createButton(text: "Remove first gray VC", selector: #selector(dropFirstGrayViewController)))
        stackView.addArrangedSubview(createButton(text: "Remove last gray VC", selector: #selector(dropLastGrayViewController)))
        stackView.addArrangedSubview(createButton(text: "Remove all gray VCs", selector: #selector(removeAllGrayViewControllers)))
        stackView.addArrangedSubview(createButton(text: "Remove all VCs exept Last", selector: #selector(removeAllViewControllersExeptLast)))
        stackView.addArrangedSubview(createButton(text: "Remove all exept first and last VCs", selector: #selector(removeAllViewControllersExeptFirstAndLast)))
        stackView.addArrangedSubview(createButton(text: "Remove all ViewController2()", selector: #selector(removeAllViewControllers2)))
        stackView.addArrangedSubview(createButton(text: "Remove first VCs where bg != .gray", selector: #selector(dropFirstViewControllers)))
        stackView.addArrangedSubview(createButton(text: "Remove last VCs where bg == .gray", selector: #selector(dropLastViewControllers)))
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        if title?.isEmpty ?? true { title = "First" }
    }

    private func createButton(text: String, selector: Selector) -> UIButton {
        let button = UIButton()
        button.setTitle(text, for: .normal)
        button.setTitleColor(.blue, for: .normal)
        button.addTarget(self, action: selector, for: .touchUpInside)
        return button
    }
}

extension ViewController {

    private func createViewController<VC: ViewController>(backgroundColor: UIColor = .white) -> VC {
        let viewController = VC()
        let counter = (navigationController?.viewControllers.count ?? -1 ) + 1
        viewController.tag = counter
        viewController.title = "Controller \(counter)"
        viewController.view.backgroundColor = backgroundColor
        return viewController
    }

    @objc func pushWhiteViewController() {
        navigationController?.pushViewController(createViewController(), animated: true)
    }

    @objc func pushGrayViewController() {
        navigationController?.pushViewController(createViewController(backgroundColor: .lightGray), animated: true)
    }

    @objc func pushController2() {
        navigationController?.pushViewController(createViewController(backgroundColor: .green) as ViewController2, animated: true)
    }

    @objc func pushViewControllerAndRemovePrevious() {
        navigationController?.pushViewController(createViewController(), animated: true)
        removeFromNavigationController()
    }

    @objc func removeAllGrayViewControllers() {
        navigationController?.removeControllers(.all) { $0.view.backgroundColor == .lightGray }
    }

    @objc func removeAllViewControllersExeptLast() {
        navigationController?.removeControllers(.all) { $0 != self }
    }

    @objc func removeAllViewControllersExeptFirstAndLast() {
        guard let navigationController = navigationController, navigationController.viewControllers.count > 1 else { return }
        let lastIndex = navigationController.viewControllers.count - 1
        navigationController.removeControllers(in: 1..<lastIndex)
    }

    @objc func removeAllViewControllers2() {
        navigationController?.removeControllers(.all) { $0.isKind(of: ViewController2.self) }
    }

    @objc func dropFirstViewControllers() {
        navigationController?.removeControllers(.first) { $0.view.backgroundColor != .lightGray }
    }

    @objc func dropLastViewControllers() {
        navigationController?.removeControllers(.last) { $0.view.backgroundColor == .lightGray }
    }

    @objc func dropFirstGrayViewController() {
        navigationController?.removeController(.first) { $0.view.backgroundColor == .lightGray }
    }

    @objc func dropLastGrayViewController() {
        navigationController?.removeController(.last) { $0.view.backgroundColor == .lightGray }
    }
}

结果

Answer 10

迅速5：

        navigationController?.viewControllers.removeAll(where: { (vc) -> Bool in
            if vc.isKind(of: MyViewController.self) || vc.isKind(of: MyViewController2.self) {
                return false
            }
            else {
                return true
            }
        })

Answer 11

Swift 5.1，Xcode 11

extension UINavigationController{
public func removePreviousController(total: Int){
    let totalViewControllers = self.viewControllers.count
    self.viewControllers.removeSubrange(totalViewControllers-total..<totalViewControllers - 1)
}}

确保在先前控制器的viewDidDisappear（）或新控制器的viewDidAppear（）之后调用此实用程序功能

Answer 12

此解决方案很快对我有效：

let VCCount = self.navigationController!.viewControllers.count
self.navigationController?.viewControllers.removeSubrange(Range(VCCount-3..<VCCount - 1))

您当前在堆栈中的视图控制器索引为：

self.navigationController!.viewControllers.count - 1

Answer 13

我写了一个方法扩展，除非另有说明，否则它会删除root和top之间的所有控制器。

extension UINavigationController {
func removeControllers(between start: UIViewController?, end: UIViewController?) {
    guard viewControllers.count > 1 else { return }
    let startIndex: Int
    if let start = start {
        guard let index = viewControllers.index(of: start) else {
            return
        }
        startIndex = index
    } else {
        startIndex = 0
    }

    let endIndex: Int
    if let end = end {
        guard let index = viewControllers.index(of: end) else {
            return
        }
        endIndex = index
    } else {
        endIndex = viewControllers.count - 1
    }
    let range = startIndex + 1 ..< endIndex
    viewControllers.removeSubrange(range)
}

}

如果要使用范围（例如2到5），则可以使用

    let range = 2 ..< 5
    viewControllers.removeSubrange(range)

在iOS 12.2，Swift 5上测试

Answer 14

///从堆栈中按类名删除视图控制器，然后关闭当前视图。

 self.navigationController?.viewControllers.removeAll(where: { (vc) -> Bool in
      if vc.isKind(of: ViewController.self) || vc.isKind(of: ViewController2.self) 
       {
        return true
        } 
     else 
        {
         return false
         }
        })
self.navigationController?.popViewController(animated: false)
self.dismiss(animated: true, completion: nil)

从导航堆栈中删除viewcontrollers

14 个答案:

详细信息

解决方案

用法

完整样本

结果