如何在Swift 4中通过POST请求发送图像？

import UIKit

func sendImage() {
    let url = URL(string: "https://example.com/upload") // 替换为实际的上传URL
    
    guard let image = UIImage(named: "image.jpg") else {
        print("无法加载图像")
        return
    }
    
    guard let imageData = image.jpegData(compressionQuality: 0.8) else {
        print("无法转换图像为数据")
        return
    }
    
    var request = URLRequest(url: url!)
    request.httpMethod = "POST"
    
    let boundary = "Boundary-\(UUID().uuidString)"
    let contentType = "multipart/form-data; boundary=\(boundary)"
    request.setValue(contentType, forHTTPHeaderField: "Content-Type")
    
    var body = Data()
    
    // 添加图像数据
    body.append("--\(boundary)\r\n".data(using: .utf8)!)
    body.append("Content-Disposition: form-data; name=\"image\"; 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".data(using: .utf8)!)
    
    // 添加其他参数
    body.append("--\(boundary)--\r\n".data(using: .utf8)!)
    
    request.httpBody = body
    
    let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
        if let error = error {
            print("请求错误: \(error)")
            return
        }
        
        guard let response = response as? HTTPURLResponse else {
            print("无效的响应")
            return
        }
        
        if response.statusCode == 200 {
            print("图像上传成功")
        } else {
            print("图像上传失败，状态码: \(response.statusCode)")
        }
    }
    
    task.resume()
}

sendImage()