Ios Swift---[\u UIAlertControlleratorPresentationController adaptivePresentationController]：发送到实例0x104fb1420的无法识别的选择器

我的应用程序在生产上崩溃了，我无法重现Fabric一直发送给我的错误。UISearchController有一些问题，但当我在应用程序上使用它时，效果很好。 我注意到的一件事是，在所有设备出现此错误时，可用的ram内存都很低。这可能与内存泄漏有关？由于需要更多内存，操作系统可能会解除分配对象，从而“无法识别的选择器发送到实例”，因为尝试发送消息（函数）的对象已经解除分配，但它是一个来宾，所以我仍然面临这个问题，在我的应用程序中，此时我没有任何内存泄漏

堆栈跟踪：

    Fatal Exception: NSInvalidArgumentException

-[_UIAlertControllerAlertPresentationController adaptivePresentationController]: unrecognized selector sent to instance 0x104fb1420
 Raw Text
0
CoreFoundation  
__exceptionPreprocess
1   libobjc.A.dylib 
objc_exception_throw
2   CoreFoundation  
__methodDescriptionForSelector
3
CoreFoundation  
___forwarding___
4   CoreFoundation  
_CF_forwarding_prep_0
5
UIKit   
-[UISearchController _searchPresentationController]
6   UIKit   
-[_UISearchControllerInPlaceSearchBarAnimator animateTransition:]
7   UIKit   
__56-[UIPresentationController runTransitionForCurrentState]_block_invoke
8   UIKit   
_runAfterCACommitDeferredBlocks
9   UIKit   
_cleanUpAfterCAFlushAndRunDeferredBlocks
10  UIKit   
_afterCACommitHandler
11  CoreFoundation  
__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__
12  CoreFoundation  
__CFRunLoopDoObservers
13  CoreFoundation  
__CFRunLoopRun
14  CoreFoundation  
CFRunLoopRunSpecific
15  GraphicsServices    
GSEventRunModal
16
UIKit   
UIApplicationMain
17  *****   
MAMarketPlaceViewModel.swift line 14
main
18  libdyld.dylib   
start

以下是我使用SearchController的方式：

lazy var searchController = { () -> UISearchController in

        let search = UISearchController(searchResultsController: nil)
        search.searchResultsUpdater = self
        search.delegate = self
        search.hidesNavigationBarDuringPresentation = false
        search.dimsBackgroundDuringPresentation = false
        search.definesPresentationContext = true
        search.searchBar.placeholder = L10n.searchProducts
        search.searchBar.delegate = self

        return search
    }()
....
fileprivate func setupNavigationBar() {

        if #available(iOS 11.0, *) {
            self.navigationController?.navigationBar.prefersLargeTitles = true
            self.navigationItem.largeTitleDisplayMode = .always
            self.navigationItem.searchController = searchController
            self.navigationController?.navigationBar.tintColor = UIColor.Palette.intenseGray
            self.navigationItem.hidesSearchBarWhenScrolling = false
        } else {
            self.extendedLayoutIncludesOpaqueBars = true
            searchController.searchBar.searchBarStyle = .prominent
            tableView.tableHeaderView = searchController.searchBar
        }
        if self.tableView.tableHeaderView != nil {
            self.tableView.tableHeaderView?.isHidden = false
        }
    }

更新

在RxSwift的onError事件中，我正在显示AlertController，这是我认为唯一有UISearchController和显示AlertController的地方

protocol MarketCartPresentable : class {
  var disposeBag : DisposeBag { get }
  func showCart()
  func present(product: MAProductMktPlace, with cart: MACarts)

}
extension MarketCartPresentable where Self : MAMainViewController, Self : MAMainViewControllerProtocol {

func showCart() {

    guard let viewModel = self.viewModel as? Buyable else { return } //We need to have a ViewModel which impements Buyable Protocol! =)

    viewModel.getCarts()
        .asDriver(onErrorJustReturn: MACarts())
        .asObservable()
        .observeOn(MainScheduler.instance)
        .subscribe(onNext: { [weak self](carts) in

            let cartViewModel = MAMktCartViewModel(cartLines: carts)
            let cartViewController = MAMktCartViewController(_associatedViewModel: cartViewModel)
            let cartNavController = MACheckoutNavigationController(rootViewController: cartViewController)
            self?.present(cartNavController, animated: true, completion: {

            })

            }, onError: { [weak self] (error) in

                guard let errorMsg = error as? MAErrorProtocol else {

                    self?.showAlertWith(title: L10n.errorTitle , message: error.localizedDescription)
                    return
                }

                self?.showAlertWith(title: L10n.errorTitle , message: errorMsg.errorMessage)

        }).addDisposableTo(self.disposeBag)
}

---

无法识别的选择器

肯定不是内存泄漏。您在哪里显示警报（

UIAlertController

）？是否有理由将

searchController

声明为

lazy

？我正在从UIViewController扩展中显示UIAlertController:

func showartwith（标题：字符串，消息：字符串）{let alert=UIAlertController（标题：标题，消息：消息，首选样式：。警报）让actionOk=UIAlertAction（标题：“Ok”，样式：。默认值，处理程序：{{in}）警报。添加操作（actionOk）self.present（警报，动画：true，完成：nil）}

此外，如果网络请求出现问题，我会发出警报，但我的显示方式是在协议扩展实现中的函数上，并使用[weak self]引用ViewController，因为它处于ViewController持有的闭包中。我已用更多数据更新了我的问题