使用 SwiftUI 开发 App，alert 和 confirmationDialog 都可以用于显示需要用户确认的重要选择。

根据苹果的最佳实践，警告信息推荐使用 alert，确认对话框更推荐使用 confirmationDialog。

.alert

.alert("确定要删除这部电影吗？", isPresented: Binding(
    get: { movieToDelete != nil },
    set: { if !$0 { movieToDelete = nil } }
)) {
    Button("删除", role: .destructive) {
        if let movie = movieToDelete {
            withAnimation {
                modelContext.delete(movie)
                movieToDelete = nil
            }
        }
    }
    Button("取消", role: .cancel) {
        movieToDelete = nil
    }
} message: {
    if let movie = movieToDelete {
        Text("《\(movie.title)》将被永久删除")
    }
}

.confirmationDialog

.confirmationDialog(
    "确定要删除这部电影吗？",
    isPresented: Binding(
        get: { movieToDelete != nil },
        set: { if !$0 { movieToDelete = nil } }
    ),
    titleVisibility: .visible
) {
    Button("删除", role: .destructive) {
        if let movie = movieToDelete {
            withAnimation {
                modelContext.delete(movie)
                movieToDelete = nil
            }
        }
    }
    Button("取消", role: .cancel) {
        movieToDelete = nil
    }
} message: {
    if let movie = movieToDelete {
        Text("《\(movie.title)》将被永久删除")
    }
}