如何在新创建的SwiftUI项目中处理这些错误消息？

struct ContentView: View {
    @State private var showAlert = false
    @State private var errorMessage = ""
    
    var body: some View {
        VStack {
            // UI内容
        }
        .alert(isPresented: $showAlert) {
            Alert(title: Text("错误"), message: Text(errorMessage), dismissButton: .default(Text("确定")))
        }
        .onAppear {
            do {
                // 可能引发错误的代码
            } catch let error {
                // 处理错误
                errorMessage = error.localizedDescription
                showAlert = true
            }
        }
    }
}