多条件渲染TextEditor视图时的Undo崩溃问题

复现环境 #

• macOS 12.5.1 模拟器
• Xcode 14.0

复现步骤 #

1. 点击“Edit first”按钮
2. 将第一个输入框内容改为“helloo”
3. 点击“Edit second”按钮
4. 点击“Edit”菜单中的“Undo”选项，或使用Cmd+Z快捷键

预期与实际行为 #

• 预期：无任何反应（第二个输入框未被修改，第一个TextEditor已不再渲染）
• 实际：应用崩溃，报错 Thread 1: EXC_BAD_ACCESS (code=1, address=0x0)

疑问 #

这是系统Bug，还是需要在视图消失时显式清理输入框的Undo历史记录？

代码示例 #

import SwiftUI

@main
struct MacosPlaygroundApp: App {
    var body: some Scene {
        WindowGroup("Playground") {
            TextEditors()
                .frame(width: 700, height: 300, alignment: .center)
        }
    }
}

struct TextEditors: View {

    @State private var edited: Edited = .none
    @State private var input1: String = "hello"
    @State private var input2: String = "world"

    @FocusState private var focused1: Bool
    @FocusState private var focused2: Bool

    var body: some View {
        Button("Edit none") { edited = .none }
        Button("Edit first") { edited = .first }
        Button("Edit second") { edited = .second }

        if case .first = edited {
            TextEditor(text: $input1)
                .focused($focused1)
                .onAppear { Task { focused1 = true } }
        }

        if case .second = edited {
            TextEditor(text: $input2)
                .focused($focused2)
                .onAppear { Task { focused2 = true } }
        }
    }

    private enum Edited {
        case none
        case first
        case second
    }
}

错误详情 #

多次运行后会出现两种结果：

1. 多数情况下，@main附近报错 Thread 1: EXC_BAD_ACCESS (code=1, address=0x5fdaa4174c7758)（地址不固定），在控制台执行 po [$arg1 reason] 返回：

error: errored out in DoExecute, couldn't PrepareToExecuteJITExpression

2. 少数情况下不会崩溃，但控制台会输出以下信息：

2022-09-24 20:30:47.236018+0200 MacosPlayground[13230:380687] Metal API验证已启用
2022-09-24 20:30:54.489970+0200 MacosPlayground[13230:380687] -[_CUIInternalLinkRendition _undoRedoTextOperation:]: 无法识别的选择器发送到实例 0x129798880
2022-09-24 20:30:54.490397+0200 MacosPlayground[13230:380687] [常规] 引发未捕获异常
2022-09-24 20:30:54.490457+0200 MacosPlayground[13230:380687] [常规] -[_CUIInternalLinkRendition _undoRedoTextOperation:]: 无法识别的选择器发送到实例 0x129798880
2022-09-24 20:30:54.495192+0200 MacosPlayground[13230:380687] [常规] (
    0   CoreFoundation                      0x000000018eb5d1a8 __exceptionPreprocess + 240
    1   libobjc.A.dylib                     0x000000018e8a7e04 objc_exception_throw + 60
    2   CoreFoundation                      0x000000018ebf0f4c -[NSObject(NSObject) __retain_OA] + 0
    3   CoreFoundation                      0x000000018eabc554 ___forwarding___ + 1764
    4   CoreFoundation                      0x000000018eabbdb0 _CF_forwarding_prep_0 + 96
    5   Foundation                          0x000000018fa92458 -[_NSUndoStack popAndInvoke] + 180
    6   Foundation                          0x000000018fa92190 -[NSUndoManager undoNestedGroup] + 292
    7   AppKit                              0x00000001918465c8 -[NSApplication(NSResponder) sendAction:to:from:] + 460
    8   AppKit                              0x000000019193c2ec -[NSMenuItem _corePerformAction] + 444
    9   AppKit                              0x000000019193bfe0 -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] + 100
    10  AppKit                              0x0000000191984bd8 -[NSMenu performActionForItemAtIndex:] + 200
    11  AppKit                              0x0000000191984af8 -[NSMenu _internalPerformActionForItemAtIndex:] + 100
    12  AppKit                              0x0000000191984904 -[NSCarbonMenuImpl _carbonCommandProcessEvent:handlerCallRef:] + 116
    13  AppKit                              0x000000019191fe70 NSSLMMenuEventHandler + 728
    14  HIToolbox                           0x00000001976f26c8 _ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec + 1084
    15  HIToolbox                           0x00000001976f1b4c _ZL30SendEventToEventTargetInternalP14OpaqueEventRefP20OpaqueEventTargetRefP14HandlerCallRec + 356
    16  HIToolbox                           0x0000000197707e50 SendEventToEventTarget + 40
    17  HIToolbox                           0x0000000197768870 _ZL18SendHICommandEventjPK9HICommandjjhPKvP20OpaqueEventTargetRefS5_PP14OpaqueEventRef + 416
    18  HIToolbox                           0x000000019778d9ac SendMenuCommandWithContextAndModifiers + 56
    19  HIToolbox                           0x000000019778d93c SendMenuItemSelectedEvent + 352
    20  HIToolbox                           0x000000019778d768 _ZL19FinishMenuSelectionP13SelectionDataP10MenuResultS2_ + 100
    21  HIToolbox                           0x000000019778e128 _ZL14MenuSelectCoreP8MenuData5PointdjPP13OpaqueMenuRefPt + 560
    22  HIToolbox                           0x000000019778de48 _HandleMenuSelection2 + 416
    23  AppKit                              0x00000001917df6f0 _NSHandleCarbonMenuEvent + 300
    24  AppKit                              0x00000001917df4d0 _DPSEventHandledByCarbon + 68
    25  AppKit                              0x00000001916415b4 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 3280
    26  AppKit                              0x0000000191632fe0 -[NSApplication run] + 596
    27  AppKit                              0x00000001916046fc NSApplicationMain + 1132
    28  SwiftUI                             0x00000001b4059e98 $s7SwiftUI6runAppys5NeverOSo21NSApplicationDelegate_So11NSResponderCXcFTf4e_nAA07TestingdG0C_Tg5 + 148
    29  SwiftUI                             0x00000001b4be8588 $s7SwiftUI6runAppys5NeverOxAA0D0RzlF + 260
    30  SwiftUI                             0x00000001b465e26c $s7SwiftUI3AppPAAE4mainyyFZ + 128
    31  MacosPlayground                     0x0000000100d4941c $s15MacosPlayground0aB3AppV5$mainyyFZ + 40
    32  MacosPlayground                     0x0000000100d4c07c main + 12
    33  dyld                                0x000000010108908c start + 520

内容的提问来源于stack exchange，提问作者bzyr