ios - 简单的 SwiftUI 代码产生 : UIViewAlertForUnsatisfiableConstraints. 为什么？

Question

环境 Xcode 版本 12.4 (12D4e)

场景:我发现一个区域显然违反了约束。
我将其缩小到 .navigationTitle。

import SwiftUI

struct ContentView: View {
    var body: some View {
        NavigationView {
            VStack {
                Text("Hello World")
            }.navigationTitle("Turkey")
        }
    }
}

就是这样。
如果我删除 .navigationTitle()，它就会清除。

以下是控制台中列出的约束违规:

2021-02-09 19:14:38.578190-0800 NavBarCheck[6300:437683] [LayoutConstraints] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. 
    Try this: 
        (1) look at each constraint and try to figure out which you don't expect; 
        (2) find the code that added the unwanted constraint or constraints and fix it. 
(
    "<NSLayoutConstraint:0x600003149ef0 'BIB_Trailing_CB_Leading' H:[_UIModernBarButton:0x12c01a770]-(6)-[_UIModernBarButton:0x12c0191e0'Turkey']   (active)>",
    "<NSLayoutConstraint:0x600003149f40 'CB_Trailing_Trailing' _UIModernBarButton:0x12c0191e0'Turkey'.trailing <= _UIButtonBarButton:0x12c018560.trailing   (active)>",
    "<NSLayoutConstraint:0x60000314acb0 'UINav_static_button_horiz_position' _UIModernBarButton:0x12c01a770.leading == UILayoutGuide:0x600002b65260'UIViewLayoutMarginsGuide'.leading   (active)>",
    "<NSLayoutConstraint:0x60000314ad00 'UINavItemContentGuide-leading' H:[_UIButtonBarButton:0x12c018560]-(0)-[UILayoutGuide:0x600002b65180'UINavigationBarItemContentLayoutGuide']   (active)>",
    "<NSLayoutConstraint:0x60000314c780 'UINavItemContentGuide-trailing' UILayoutGuide:0x600002b65180'UINavigationBarItemContentLayoutGuide'.trailing == _UINavigationBarContentView:0x12ae0f100.trailing   (active)>",
    "<NSLayoutConstraint:0x60000314b3e0 'UIView-Encapsulated-Layout-Width' _UINavigationBarContentView:0x12ae0f100.width == 0   (active)>",
    "<NSLayoutConstraint:0x60000314cb40 'UIView-leftMargin-guide-constraint' H:|-(0)-[UILayoutGuide:0x600002b65260'UIViewLayoutMarginsGuide'](LTR)   (active, names: '|':_UINavigationBarContentView:0x12ae0f100 )>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x600003149ef0 'BIB_Trailing_CB_Leading' H:[_UIModernBarButton:0x12c01a770]-(6)-[_UIModernBarButton:0x12c0191e0'Turkey']   (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.

---

问题:这是一个错误吗？或者，如果没有，发生了什么并采取补救措施？

Answer 1

NavigationBarTitle 和 NavigationTitle 从 iOS 14.3 开始弃用。尝试在导航 View 上添加 .navigationViewStyle(StackNavigationViewStyle())。

此解决方案的所有功劳都归功于 https://stackoverflow.com/a/66024249/15184473