如何从NSDocumentDirectory读取数据

import UIKit
import Foundation

func readFileFromNSDocumentDirectory(fileName: String) -> String? {
    let fileManager = FileManager.default
    let documentDirectory = fileManager.urls(for: .documentDirectory, in: .userDomainMask).first!
    let fileUrl = documentDirectory.appendingPathComponent(fileName)
    if fileManager.fileExists(atPath: fileUrl.path) {
        do {
            let content = try String(contentsOf: fileUrl, encoding: .utf8)
            return content
        } catch {
            print("Error reading file: \(error)")
        }
    } else {
        print("File not found in NSDocumentDirectory")
    }
    return nil
}

if let content = readFileFromNSDocumentDirectory(fileName: "example.txt") {
    print("File content: \(content)")
} else {
    print("Error reading file")
}