Minimal example app for showcasing a crash issue discussed on StackOverflow triggered by the usage pattern described below.
The app
simply allows the user to add a list of text items that the user can edit in a sheet component.
The items are stored in an array in a struct model stored as @State in the App struct at the root of the app.
A button in the bottom of the screen creates a new item.
The crash occurs if we attempt to make the sheet open the newly created item automatically.
The attempted solution stores a binding (to make the item editable) to the newly created item in a @State variable (to make it mutable) of the view.
The variable is optional as the sheet is open iff the value is non-nil.
Setting this binding in response to clicking on an existing item works without issues.
But setting it to an item that has just been created (line 25; commented out on main) causes the debugger to break on the @main annotation with the error
Thread 1: Fatal error: Index out of range
The log contains the following:
Binding<Item>(transaction: SwiftUI.Transaction(plist: []), location: SwiftUI.LocationBox<SwiftUI.FunctionalLocation<swiftui_binding_issue.Item>>, _value: swiftui_binding_issue.Item(id: "New item"))
Binding<Item>(transaction: SwiftUI.Transaction(plist: []), location: SwiftUI.LocationBox<SwiftUI.FunctionalLocation<swiftui_binding_issue.Item>>, _value: swiftui_binding_issue.Item(id: "New item"))
Swift/ContiguousArrayBuffer.swift:600: Fatal error: Index out of range