confirmationDialog(_:isPresented:titleVisibility:presenting:actions:message:)

Discussion 議論

In order for the interface to appear, both isPresented must be true and data must not be nil. data should not change after the presentation occurs. Any changes which occur after the presentation occurs will be ignored.

Use this method when you need to populate the fields of a confirmation dialog with content from a data source. The example below shows a custom data source, FileDetails, that provides data to populate the dialog:

struct FileDetails: Identifiable {
    var id: String { name }
    let name: String
    let fileType: UTType
}
struct ConfirmFileImport: View {
    @State private var isConfirming = false
    @State private var dialogDetail: FileDetails?
    var body: some View {
        Button("Import File") {
            dialogDetail = FileDetails(
                name: "MyImageFile.png", fileType: .png)
            isConfirming = true
        }
        .confirmationDialog(
            "Are you sure you want to import this file?",
            isPresented: $isConfirming, presenting: dialogDetail
        ) { detail in
            Button {
                // Handle import action.
            } label: {
                Text("Import \(detail.name)")
            }
            Button("Cancel", role: .cancel) {
                dialogDetail = nil
            }
        } message: { detail in
            Text(
                """
                This will add \(detail.name).\(detail.fileType) \
                to your library.
                """)
        }
    }
}

This modifier creates a Text view for the title on your behalf, and treats the localized key similar to init(_:tableName:bundle:comment:). See Text for more information about localizing strings. Textを文字列のローカライズについてのさらなる情報として見てください。

All actions in a confirmation dialog will dismiss the dialog after the action runs. The default button will be shown with greater prominence. You can influence the default button by assigning it the defaultAction keyboard shortcut.

The system may reorder the buttons based on their role and prominence.

Dialogs include a standard dismiss action by default. If you provide a button with a role of cancel, that button takes the place of the default dismiss action. You don’t have to dismiss the presentation with the cancel button’s action.

On iOS, tvOS, and watchOS, confirmation dialogs only support controls with labels that are Text. Passing any other type of view results in the content being omitted.