在SwiftUI中导入文件后，如何将导入的文件名保存为字符串？

struct ContentView: View {
    @State private var fileURL: URL?
    
    var body: some View {
        VStack {
            Button("导入文件") {
                let panel = NSOpenPanel()
                panel.allowsMultipleSelection = false
                panel.canChooseFiles = true
                panel.canChooseDirectories = false
                panel.allowedFileTypes = ["txt", "pdf", "doc"]
                
                if panel.runModal() == .OK {
                    fileURL = panel.url
                }
            }
            
            Text("选择的文件：\(fileURL?.lastPathComponent ?? "")")
        }
    }
}