Swift 5 Alamofire 与 PHP 实现 iOS 图片上传教程

import Alamofire
import UIKit

// 假设 imageData 是 UIImage 转换而来的 Data
// 例如：let imageData = UIImage(named: "yourImage")?.pngData()
guard let imageData = UIImage(named: "testImage")?.pngData() else {
    print("图片数据为空或无法转换")
    return
}

let uploadURL = URL(string: "http://your-server-domain.com/upload.php")! // 替换为你的PHP上传脚本URL

Alamofire.upload(
    multipartFormData: { multipartFormData in
        // 关键点：withName 必须与 PHP 端 $_FILES 数组的键名一致
        multipartFormData.append(imageData, withName: "image", fileName: "test.png", mimeType: "image/png")
        print("准备上传图片...")
    },
    to: uploadURL,
    method: .post, // 明确指定为 POST 方法，文件上传通常使用 POST
    encodingCompletion: { encodingResult in
        switch encodingResult {
        case .success(let upload, _, _):
            upload.responseJSON { response in
                debugPrint(response) // 打印服务器响应
                if let json = response.value {
                    print("上传成功，服务器响应: \(json)")
                } else if let error = response.error {
                    print("上传成功但解析响应失败: \(error)")
                }
            }
            .uploadProgress { progress in
                // 可以在这里更新上传进度UI
                print("上传进度: \(progress.fractionCompleted * 100)%")
            }
        case .failure(let encodingError):
            print("编码失败: \(encodingError)")
        }
    }
)

<?php

header('Content-Type: application/json'); // 确保响应头为 JSON

$response = array();

// 检查是否有文件上传，并且键名为 "image"
if (empty($_FILES["image"]) || $_FILES["image"]["error"] != UPLOAD_ERR_OK) {
    // 根据 $_FILES["image"]["error"] 的值提供更具体的错误信息
    $error_code = isset($_FILES["image"]["error"]) ? $_FILES["image"]["error"] : 'No file data';
    $response = array("status" => "Failure", "error" => "No or invalid file data received", "error_code" => $error_code);
} else {
    // 确保客户端传入的 name 与服务器端预期的 name 一致
    // 客户端 `withName: "image"` 对应 PHP `$_FILES["image"]`
    $uploaded_file_info = $_FILES["image"];

    $filename = $uploaded_file_info["name"];
    // 定义保存路径，请确保该目录存在且 PHP 进程有写入权限
    // 注意：D:/emailback/images/ 是 Windows 路径，Linux/macOS 通常是 /var/www/html/images/ 或类似的
    $upload_directory = "images/"; // 假设脚本位于 web 根目录，且 images 目录与脚本同级
    if (!is_dir($upload_directory)) {
        mkdir($upload_directory, 0777, true); // 如果目录不存在则创建
    }
    $path = $upload_directory . basename($filename); // 使用 basename 避免路径注入

    // 移动临时文件到目标位置
    if (move_uploaded_file($uploaded_file_info['tmp_name'], $path)) {
        $response['status'] = "success";
        // 修正：$_FILES["file"]["name"] 应为 $_FILES["image"]["name"]
        $response['filename'] = $uploaded_file_info["name"];
        $response['filepath'] = $path;
        $response['mime_type'] = $uploaded_file_info["type"];
        $response['size'] = $uploaded_file_info["size"];
    } else {
        $response['status'] = "Failure";
        $response['error']  = "Failed to move uploaded file.";
        $response['name']   = $uploaded_file_info["name"];
        $response['path']   = $path;
        $response['type']   = $uploaded_file_info["type"];
        $response['size']   = $uploaded_file_info["size"];
        $response['error_code'] = $uploaded_file_info["error"]; // 记录PHP上传错误码
    }
}

echo json_encode($response);

?>