Swift iOS应用上传图文：现有FTP服务器可行吗？求最简实现方案

Hey there! Let's tackle your questions step by step—since you're building an iOS app in Swift and need to handle image + text uploads, I've been in this exact spot before, so let's break it down.

FTP vs. HTTP/REST 接口：哪个更适合？ #

First off, FTP is not ideal for this scenario—here's why:

• Security: Standard FTP sends credentials and data in plaintext, which is a huge red flag for user data. Even FTPS/SFTP adds extra complexity for both your app and server setup.
• iOS Native Support: While you can find third-party FTP libraries, Apple's native APIs don't prioritize FTP. You'll have to handle more low-level stuff like connection states, passive mode configurations, and error handling that's already solved for HTTP.
• Compatibility with Downloads: When you need to fetch those images/text later, HTTP is far easier—you can just use UIImageView extensions or URLSession directly, no FTP client logic required.

Go with an HTTP/REST API (what you called a "Web portal") instead—it's simpler, more secure, and fits perfectly with iOS's existing tools. You can spin up a basic POST endpoint on your server in minutes, and use Swift's built-in URLSession to handle uploads without any heavy frameworks.

极简实现：不用冗余框架 #

You're right—tools like Backendless, Alamofire, or Gold Raccoon are overkill for a simple upload task. Here's how to do it with pure Swift and a basic server endpoint:

Swift 端（原生 URLSession 实现） #

This code handles multipart/form-data uploads (the standard way to send files + text together):

import UIKit

func uploadImageAndText(image: UIImage, text: String, completion: @escaping (Bool, Error?) -> Void) {
    guard let imageData = image.jpegData(compressionQuality: 0.8) else {
        completion(false, NSError(domain: "UploadError", code: 1, userInfo: [NSLocalizedDescriptionKey: "Failed to convert image to data"]))
        return
    }
    
    // Replace with your server endpoint URL
    guard let url = URL(string: "https://your-server.com/upload") else {
        completion(false, NSError(domain: "UploadError", code: 2, userInfo: [NSLocalizedDescriptionKey: "Invalid server URL"]))
        return
    }
    
    var request = URLRequest(url: url)
    request.httpMethod = "POST"
    
    // Create multipart form data
    let boundary = UUID().uuidString
    request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
    
    var body = Data()
    
    // Add text field
    body.append("--\(boundary)\r\n".data(using: .utf8)!)
    body.append("Content-Disposition: form-data; name=\"userText\"\r\n\r\n".data(using: .utf8)!)
    body.append("\(text)\r\n".data(using: .utf8)!)
    
    // Add image file
    body.append("--\(boundary)\r\n".data(using: .utf8)!)
    body.append("Content-Disposition: form-data; name=\"userImage\"; filename=\"image.jpg\"\r\n".data(using: .utf8)!)
    body.append("Content-Type: image/jpeg\r\n\r\n".data(using: .utf8)!)
    body.append(imageData)
    body.append("\r\n--\(boundary)--\r\n".data(using: .utf8)!)
    
    request.httpBody = body
    
    // Execute request
    let task = URLSession.shared.dataTask(with: request) { data, response, error in
        if let error = error {
            completion(false, error)
            return
        }
        
        guard let httpResponse = response as? HTTPURLResponse, (200...299).contains(httpResponse.statusCode) else {
            completion(false, NSError(domain: "UploadError", code: 3, userInfo: [NSLocalizedDescriptionKey: "Server returned an error"]))
            return
        }
        
        completion(true, nil)
    }
    task.resume()
}

// Usage example:
if let sampleImage = UIImage(named: "sample") {
    uploadImageAndText(image: sampleImage, text: "Hello from my iOS app!") { success, error in
        DispatchQueue.main.async {
            if success {
                print("Upload successful!")
            } else {
                print("Upload failed: \(error?.localizedDescription ?? "Unknown error")")
            }
        }
    }
}

服务器端（极简 PHP 示例） #

If you're using a PHP server, this basic script will handle the upload and save the image + text (adjust paths as needed):

<?php
// Set upload directory (make sure it's writable)
$uploadDir = './uploads/';
if (!file_exists($uploadDir)) {
    mkdir($uploadDir, 0777, true);
}

// Handle text data
$userText = $_POST['userText'] ?? '';

// Handle image upload
$imageFile = $_FILES['userImage'] ?? null;
if ($imageFile && $imageFile['error'] === UPLOAD_ERR_OK) {
    $imageName = uniqid() . '.jpg';
    $imagePath = $uploadDir . $imageName;
    
    if (move_uploaded_file($imageFile['tmp_name'], $imagePath)) {
        // Save text to a file (or database, if you prefer)
        file_put_contents($uploadDir . $imageName . '.txt', $userText);
        http_response_code(200);
        echo "Upload successful";
    } else {
        http_response_code(500);
        echo "Failed to save image";
    }
} else {
    http_response_code(400);
    echo "Invalid image upload";
}
?>

Final Notes #

• Make sure your server uses HTTPS to keep data secure.
• For production, you'll want to add validation (file size limits, image type checks, text sanitization) to both the app and server.
• If you need to fetch the data later, just add a simple GET endpoint that returns the image URL and text.

内容的提问来源于stack exchange，提问作者Josh Graef