ios - 具有大标题的 UISearchController 在选项卡栏中崩溃并显示 "Only one palette with a top boundary edge can be active outside of a transition"

Question

我在 UITabBarController 中有多个选项卡。它们都有一个带有大标题的 UINavigationBar 和一个 iOS-11 内置搜索栏。但是，在选项卡之间切换会使应用程序崩溃

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason:
'Only one palette with a top boundary edge can be active outside of a transition. Current active palette is 
<_UINavigationControllerManagedSearchPalette: 0x7fc399b49980; frame = (0 96; 375 52); layer = <CALayer: 0x60c0004383a0>>'

我已经测试了此处发布的解决方法:https://stackoverflow.com/a/46382723/511299没有成功。此问题没有使用 UITabBarController。

我已将此代码添加到viewDidAppear:

DispatchQueue.main.async {
    let searchController = UISearchController(searchResultsController: nil)
    searchController.searchResultsUpdater = self
    self.navigationItem.searchController = searchController
}

并将其设置为viewWillDisappear:

self.navigationItem.searchController = nil

向每个方法添加打印以检查顺序，验证在将前一个 View 设置到显示的 View 之前是否将其清空。

从选项卡 0 转到选项卡 1，然后返回选项卡 0 后它崩溃了。我什至不需要向下滚动来显示搜索栏。

完整堆栈跟踪:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Only one palette with a top boundary edge can be active outside of a transition. Current active palette is <_UINavigationControllerManagedSearchPalette: 0x7fea7dcaf880; frame = (0 44; 375 52); layer = <CALayer: 0x60000062ac20>>'
*** First throw call stack:
(
0   CoreFoundation                      0x000000010b8381e6 __exceptionPreprocess + 294
1   libobjc.A.dylib                     0x0000000109cda031 objc_exception_throw + 48
2   CoreFoundation                      0x000000010b8ad975 +[NSException raise:format:] + 197
3   UIKit                               0x000000010e67dec6 -[UINavigationController(_UIPalette) attachPalette:isPinned:] + 521
4   UIKit                               0x000000010e659afd -[UINavigationController _createAndAttachSearchPaletteForTopViewControllerIfNecessary:] + 585
5   UIKit                               0x000000010e677c10 -[UINavigationController _navigationItemDidUpdateSearchController:oldSearchController:] + 419
6   UIKit                               0x000000010f0737a1 -[_UINavigationBarVisualProviderModernIOS navigationItemUpdatedSearchController:oldSearchController:animated:] + 160
7   UIKit                               0x000000010edf15c4 -[UINavigationItem setSearchController:] + 135
8   Appmost                             0x0000000107e5902e _T07Appmost25JsonCreatedViewControllerC14setupSearchBaryyFyycfU_ + 1486
9   Appmost                             0x0000000107e590cd _T07Appmost25JsonCreatedViewControllerC14setupSearchBaryyFyycfU_TA + 13
10  Appmost                             0x0000000107cbcb7d _T0Ieg_IeyB_TR + 45
11  libdispatch.dylib                   0x00000001124c97ab _dispatch_call_block_and_release + 12
12  libdispatch.dylib                   0x00000001124ca7ec _dispatch_client_callout + 8
13  libdispatch.dylib                   0x00000001124d58cf _dispatch_main_queue_callback_4CF + 628
14  CoreFoundation                      0x000000010b7fac99 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
15  CoreFoundation                      0x000000010b7beea6 __CFRunLoopRun + 2342
16  CoreFoundation                      0x000000010b7be30b CFRunLoopRunSpecific + 635
17  GraphicsServices                    0x0000000113adaa73 GSEventRunModal + 62
18  UIKit                               0x000000010e482057 UIApplicationMain + 159
19  Appmost                             0x0000000107f72167 main + 55
20  libdyld.dylib                       0x0000000112547955 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSExceptio

Answer 1

我尝试重现该问题，但当我在 func viewDidLoad()

中添加代码时，一切似乎都正常

下面是在iOS11中添加搜索 View Controller 的代码

    if #available(iOS 11.0, *) {
        //Setup Search Controller
        self.searchController.obscuresBackgroundDuringPresentation = false
        self.searchController.searchBar.placeholder = "Search"
        self.searchController.searchBar.barStyle = .black
        self.searchController.searchBar.delegate = self
        self.definesPresentationContext = true
        self.navigationItem.searchController = searchController
        self.navigationItem.title = "Heading 2"
    }

我还为您创建了一个演示项目，请在 Github Here 中找到它