탐색 스택에서 뷰 컨트롤러 제거

탐색 스택에서 뷰 컨트롤러 제거

5개의 UIViewController가 있는 탐색 스택이 있습니다.5번째 뷰 컨트롤러에서 버튼을 클릭하여 스택의 3번째 뷰 컨트롤러와 4번째 뷰 컨트롤러를 제거하고 싶습니다.이것을 할 수 있습니까?만약 그렇다면, 어떻게?

이 코드를 사용하여 다음을 즐기십시오.

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];

이것이 당신에게 도움이 되기를 바랍니다.

편집: 스위프트 코드

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

편집: 마지막 하나를 제외한 모든 ViewController를 제거하려면 -> 왼쪽 상단 모서리에 뒤로 버튼 없음

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

먼저 어레이의 모든 뷰 컨트롤러를 가져온 다음 해당 뷰 컨트롤러 클래스를 확인한 후 원하는 뷰 컨트롤러를 삭제할 수 있습니다.

다음은 작은 코드 조각입니다.

NSArray* tempVCA = [self.navigationController viewControllers];

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

이것이 당신의 일을 더 쉽게 해 줄 것이라고 생각합니다.

스위프트 3 & 4/5

self.navigationController!.viewControllers.removeAll()

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

스위프트 2.1

모두 제거:

self.navigationController!.viewControllers.removeAll()

색인에서 제거

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

removeFirst, range 등과 같은 더 많은 가능한 작업이 있습니다.

스위프트 5:

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

스위프트 5, Xcode 13

탐색 스택에서 제거할 뷰 컨트롤러를 지정하면 이 접근 방식이 간단하다는 것을 알게 되었습니다.

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

사용 예:

navigationController.removeViewController(YourViewController.self)

사용.setViewControllers에서 기능.UINavigationController그게 최선의 방법입니다.또한 있습니다.animated애니메이션을 활성화하는 매개 변수입니다.

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

질문에 대한 신속한 예

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)
}

다른 방법을 시도했습니다.[tempVC removeFromParentViewController];@robin-ellerkmann이 보고한 것처럼 팝업이 다시 표시될 때 ViewController 탐색이 제거되었습니다.

Swift 2.0:

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

세부 사항

• Swift 5.1, Xcode 11.3.1

해결책

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()!)
    }
}

사용.

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 }

전체 샘플

여기에 솔루션 코드를 붙여넣는 것을 잊지 마십시오.

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 }
    }
}

결과

5번째 보기 컨트롤러에서 2번째 보기 컨트롤러로 이동하려는 경우(3번째 및 4번째 보기 건너뛰기),[self.navigationController popToviewController:secondViewController].

다음을 얻을 수 있습니다.secondViewController검색할 수 있습니다.

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

사용

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

내비게이션 컨트롤러의 뷰 컨트롤러를 처리합니다.보기컨트롤러 및 탐색항목이 탐색 막대에 쌓여 있습니다.

참고: 적어도 viewDidAppear 이후에는 호출해야 합니다.

Swift 5.1, Xcode 11

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

이전 컨트롤러의 viewDidDisappear() 또는 새 컨트롤러의 viewDidAppear() 후에 이 유틸리티 함수를 호출해야 합니다.

이 솔루션은 swift 4:

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

스택의 현재 뷰 컨트롤러 인덱스는 다음과 같습니다.

self.navigationController!.viewControllers.count - 1

스위프트 5.4

제거SpecificViewController

navigationController.viewControllers.removeAll { $0 is SpecificViewController }

특별히 명시하지 않는 한 루트와 탑 사이의 모든 컨트롤러를 제거하는 방법으로 확장을 작성했습니다.

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)
}

}

범위(예: 2 ~ 5)를 사용하려면 다음을 사용합니다.

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

iOS 12.2, Swift 5에서 테스트됨

스택에서 클래스 이름별로 보기 컨트롤러를 제거한 다음 현재 보기를 해제합니다.

 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)

탐색 컨트롤러 어레이에서 컨트롤러와 해당 상위 컨트롤러를 제거해야 합니다.

 navigationController?.viewControllers.removeAll(where: { (vc) -> Bool in
        if vc.isKind(of: MyViewController.self)
            || vc.isKind(of: MyViewControllerType2.self)
            || vc.isKind(of: MyViewControllerType3.self) {

           /* remove from parent */
            vc.removeFromParent()
            return true
        } else {
            return false
        }
    })

언급URL : https://stackoverflow.com/questions/10281545/removing-viewcontrollers-from-navigation-stack