102

我有一个导航堆栈，有 5 个 UIViewControllers。我想通过单击第 5 个视图控制器中的按钮来删除堆栈中的第 3 和第 4 个视图控制器。是否有可能做到这一点？如果有怎么办？

4

15 回答 15

179

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];

希望这会帮助你。

编辑：斯威夫特代码

guard let navigationController = self.navigationController else { return }
var navigationArray = navigationController.viewControllers // To get all UIViewController stack as Array
navigationArray.remove(at: navigationArray.count - 2) // To remove previous UIViewController
self.navigationController?.viewControllers = navigationArray

编辑：删除除最后一个之外的所有 ViewController -> 左上角没有返回按钮

guard let navigationController = self.navigationController else { return }
var navigationArray = navigationController.viewControllers // To get all UIViewController stack as Array
let temp = navigationArray.last
navigationArray.removeAll()
navigationArray.append(temp!) //To remove all previous UIViewController except the last one
self.navigationController?.viewControllers = navigationArray
于 2012-04-23T13:34:40.017 回答
50

您可以先获取数组中的所有视图控制器，然后在检查相应的视图控制器类后，您可以删除您想要的。

这是一小段代码：

NSArray* tempVCA = [self.navigationController viewControllers];

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

我认为这将使您的工作更轻松。

于 2012-04-23T13:42:47.437 回答
42

斯威夫特 3 & 4/5

self.navigationController!.viewControllers.removeAll()

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

斯威夫特 2.1

移除所有：

self.navigationController!.viewControllers.removeAll()

在索引处删除

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

还有很多可能的操作，例如 removeFirst、range 等。

于 2015-12-15T08:12:33.183 回答
24

斯威夫特 5：

navigationController?.viewControllers.removeAll(where: { (vc) -> Bool in
    if vc.isKind(of: MyViewController.self) || vc.isKind(of: MyViewController2.self) {
        return false
    } else {
        return true
    }
})
于 2019-04-08T16:00:59.640 回答
16

斯威夫特 5，Xcode 13

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()
        }
    }
}

示例使用：

navigationController.removeViewController(YourViewController.self)
于 2019-09-26T05:01:58.810 回答
12

使用setViewControllers函数 fromUINavigationController是最好的方法。还有一个animated参数可以启用动画。

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

快速提问的例子 

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];. 它做出了奇怪的行为，删除了 ViewController 导航，当弹出时仍然显示 @robin-ellerkmann 报告的那样

于 2018-08-15T13:01:59.803 回答
8

斯威夫特 2.0：

  var navArray:Array = (self.navigationController?.viewControllers)!
  navArray.removeAtIndex(navArray.count-2)
  self.navigationController?.viewControllers = navArray
于 2016-02-18T06:24:30.283 回答
6

细节

  • 斯威夫特 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

不要忘记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

在此处输入图像描述

于 2020-02-05T20:14:59.327 回答
5

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

您可以secondViewController从导航控制器堆栈中获取。

secondViewController =  [self.navigationController.viewControllers objectAtIndex:yourViewControllerIndex];
于 2012-04-23T13:47:03.437 回答
4

用这个

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

它将处理 navigationController 的 ViewControllers。viewControllers 和一个在 navigationBar 中堆叠的 navigationItems。

注意：确保至少在 viewDidAppear 之后调用它

于 2018-05-28T12:55:31.030 回答
3

斯威夫特 5.1，Xcode 11 

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

确保在前一个控制器的 viewDidDisappear() 或新控制器的 viewDidAppear() 之后调用此实用程序函数

于 2019-08-02T13:18:22.167 回答
2

这个解决方案在 swift 4 中对我有用：

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是：

self.navigationController!.viewControllers.count - 1
于 2018-07-04T07:48:31.647 回答
0

除非另有说明，否则我使用方法编写了一个扩展，该方法删除了 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)
}

}

如果您想使用范围（例如：2 到 5），您可以使用

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

在 iOS 12.2、Swift 5 上测试

于 2019-08-16T11:03:33.583 回答
0

// 按类名从堆栈中删除视图控制器，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)
于 2020-07-13T16:34:25.253 回答
0

斯威夫特 5.4

去除SpecificViewController

navigationController.viewControllers.removeAll { $0 is SpecificViewController }
于 2021-11-22T11:36:15.653 回答