Xcode 每次在 Hello World 项目中使用 canvas 时发生 11 次崩溃

Question

我刚刚从 AppStore 安装了 Xcode11 并创建了一个 SwiftUI 项目。尝试在 canvas 中查看 ContentView 时，Xcode 每次都会崩溃

我尝试清理并删除 DerivedData，但没有成功创建不同的视图和不同的项目

Application Specific Information:
ProductBuildVersion: 11A420a

Dyld Error Message:
  Symbol not found: _$s7SwiftUI7BindingV13dynamicMemberACyqd__Gs15WritableKeyPathCyxqd__G_tcluig
  Referenced from: /Applications/Xcode.app/Contents/PlugIns/UVKit.framework/UVKit
  Expected in: /System/Library/Frameworks/SwiftUI.framework/Versions/A/SwiftUI

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   dyld                            0x000000011043b44e __abort_with_payload + 10
1   dyld                            0x000000011046499e abort_with_payload_wrapper_internal + 80
2   dyld                            0x00000001104649d0 abort_with_payload + 9
3   dyld                            0x00000001104621b3 dyld::halt(char const*) + 463
4   dyld                            0x00000001103eca02 dyld::fastBindLazySymbol(ImageLoader**, unsigned long) + 140
5   libdyld.dylib                   0x00007fff6c59d29e dyld_stub_binder + 282
6   ???                             0x0000000131da48e8 OBJC_CLASS_$__TtCV5UVKit19DiagnosticsPullDown10MenuTarget + 120
7   com.apple.dt.UVKit              0x0000000131ceb3d9 protocol witness for View.body.getter in conformance InsetEditor + 9
8   com.apple.SwiftUI               0x00007fff4259da39 ViewBody.apply(_:) + 585
9   com.apple.SwiftUI               0x00007fff4259ec29 protocol witness for static UntypedAttribute._update(_:graph:attribute:) in conformance ViewBody<A> + 137
10  com.apple.AttributeGraph        0x00007fff490ec259 partial apply + 25
11  com.apple.AttributeGraph        0x00007fff490d55a7 AG::Graph::UpdateStack::update() + 1111
12  com.apple.AttributeGraph        0x00007fff490d5865 AG::Graph::update_attribute(unsigned int, bool) + 377
13  com.apple.AttributeGraph        0x00007fff490d8e6f AG::Graph::input_value_ref_slow(unsigned int, unsigned int, AGTypeID, bool*) + 199
14  com.apple.SwiftUI               0x00007fff425f32b9 LayoutTraitsProxy.layoutTraits() + 41
15  com.apple.SwiftUI               0x00007fff42a5d8e3 accumulateSpacing #1 (ofChild:) in StackLayout.Header.init(layoutContext:proxies:majorAxis:minorAxisAlignment:uniformSpacing:childStorage:capacity:) + 563
16  com.apple.SwiftUI               0x00007fff42a5cd25 StackLayout.Header.init(layoutContext:proxies:majorAxis:minorAxisAlignment:uniformSpacing:childStorage:capacity:) + 805
17  com.apple.SwiftUI               0x00007fff42a5d62d specialized ManagedBufferPointer.init(bufferClass:minimumCapacity:makingHeaderWith:) + 349
18  com.apple.SwiftUI               0x00007fff42a5fc29 specialized closure #2 in HVStack.updateOutput<A>(attributeContext:layoutContext:children:) + 329
19  com.apple.SwiftUI               0x00007fff42a6208a partial apply for specialized  + 42
20  com.apple.SwiftUI               0x00007fff426a8367 specialized static LayoutComputerDelegate.update<A>(_:maybeInPlace:create:) + 247
21  com.apple.SwiftUI               0x00007fff426b6290 specialized static LayoutComputerDelegate.update<A>(_:maybeInPlace:create:) + 16
22  com.apple.SwiftUI               0x00007fff42a5ac8c specialized HVStack.updateOutput<A>(attributeContext:layoutContext:children:) + 220
23  com.apple.SwiftUI               0x00007fff42a5acf0 specialized HVStack.updateOutput<A>(attributeContext:layoutContext:children:) + 48
24  com.apple.SwiftUI               0x00007fff4281a9f6 specialized LayoutQuery<>.update(context:) + 358
25  com.apple.SwiftUI               0x00007fff4293c7ea partial apply for protocol witness for static UntypedAttribute._update(_:graph:attribute:) in conformance DynamicLayoutViewChildGeometry + 26
26  com.apple.AttributeGraph        0x00007fff490d55a7 AG::Graph::UpdateStack::update() + 1111
27  com.apple.AttributeGraph        0x00007fff490d5865 AG::Graph::update_attribute(unsigned int, bool) + 377
28  com.apple.AttributeGraph        0x00007fff490d8e6f AG::Graph::input_value_ref_slow(unsigned int, unsigned int, AGTypeID, bool*) + 199
29  com.apple.SwiftUI               0x00007fff425f32b9 LayoutTraitsProxy.layoutTraits() + 41
30  com.apple.SwiftUI               0x00007fff42a5d8e3 accumulateSpacing #1 (ofChild:) in StackLayout.Header.init(layoutContext:proxies:majorAxis:minorAxisAlignment:uniformSpacing:childStorage:capacity:) + 563
31  com.apple.SwiftUI               0x00007fff42a5cd25 StackLayout.Header.init(layoutContext:proxies:majorAxis:minorAxisAlignment:uniformSpacing:childStorage:capacity:) + 805
32  com.apple.SwiftUI               0x00007fff42a5d62d specialized ManagedBufferPointer.init(bufferClass:minimumCapacity:makingHeaderWith:) + 349
33  com.apple.SwiftUI               0x00007fff42a5fc29 specialized closure #2 in HVStack.updateOutput<A>(attributeContext:layoutContext:children:) + 329
34  com.apple.SwiftUI               0x00007fff42a6208a partial apply for specialized  + 42
35  com.apple.SwiftUI               0x00007fff426a8367 specialized static LayoutComputerDelegate.update<A>(_:maybeInPlace:create:) + 247
36  com.apple.SwiftUI               0x00007fff426b6290 specialized static LayoutComputerDelegate.update<A>(_:maybeInPlace:create:) + 16
37  com.apple.SwiftUI               0x00007fff42a5ac8c specialized HVStack.updateOutput<A>(attributeContext:layoutContext:children:) + 220
38  com.apple.SwiftUI               0x00007fff42a5acf0 specialized HVStack.updateOutput<A>(attributeContext:layoutContext:children:) + 48
39  com.apple.SwiftUI               0x00007fff4281a9f6 specialized LayoutQuery<>.update(context:) + 358
40  com.apple.SwiftUI               0x00007fff4293c7ea partial apply for protocol witness for static UntypedAttribute._update(_:graph:attribute:) in conformance DynamicLayoutViewChildGeometry + 26
41  com.apple.AttributeGraph        0x00007fff490d55a7 AG::Graph::UpdateStack::update() + 1111
42  com.apple.AttributeGraph        0x00007fff490d5865 AG::Graph::update_attribute(unsigned int, bool) + 377
43  com.apple.AttributeGraph        0x00007fff490d8e6f AG::Graph::input_value_ref_slow(unsigned int, unsigned int, AGTypeID, bool*) + 199
44  com.apple.SwiftUI               0x00007fff425f32b9 LayoutTraitsProxy.layoutTraits() + 41
45  com.apple.SwiftUI               0x00007fff42a5d8e3 accumulateSpacing #1 (ofChild:) in StackLayout.Header.init(layoutContext:proxies:majorAxis:minorAxisAlignment:uniformSpacing:childStorage:capacity:) + 563
46  com.apple.SwiftUI               0x00007fff42a5cd25 StackLayout.Header.init(layoutContext:proxies:majorAxis:minorAxisAlignment:uniformSpacing:childStorage:capacity:) + 805
47  com.apple.SwiftUI               0x00007fff42a5d62d specialized ManagedBufferPointer.init(bufferClass:minimumCapacity:makingHeaderWith:) + 349
48  com.apple.SwiftUI               0x00007fff42a5fc29 specialized closure #2 in HVStack.updateOutput<A>(attributeContext:layoutContext:children:) + 329
49  com.apple.SwiftUI               0x00007fff42a6208a partial apply for specialized  + 42
50  com.apple.SwiftUI               0x00007fff426a8367 specialized static

有什么我可以做的吗？

编辑：创建全新项目时生成的ContentView代码：

import SwiftUI

struct ContentView: View {
    var body: some View {
        Text("Hello World")
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

Answer 1

预览 canvas 不适用于 Mojave，仅适用于 Catalina。 Catalina 的当前版本是 Beta 9。我希望在 Mojave 上无法正常工作。如果在 Mojave 上，当您使用游乐场或在设备上运行时，您仍然可以看到 SwiftUI 的效果。

Xcode 每次在 Hello World 项目中使用 canvas 时发生 11 次崩溃

Xcode 11 crashes every time when using canvas with Hello World project

swiftui

xcode11