Swift Alamofire与PHP实现图片上传的完整指南

guard let image = yourUIImage else { return } // 确保图片存在
guard let imageData = image.pngData() else { // 转换为PNG数据
    print("无法获取PNG数据")
    return
}

import Alamofire
import UIKit // 假设你的图片是UIImage

func uploadImage(image: UIImage, to url: URL) {
    guard let imageData = image.pngData() else {
        print("无法获取图片PNG数据")
        return
    }

    AF.upload(multipartFormData: { multipartFormData in
        // 'image' 是服务器端用于接收文件的字段名，必须与PHP代码中的 $_FILES["image"] 对应
        multipartFormData.append(imageData, withName: "image", fileName: "test.png", mimeType: "image/png")
        print("准备上传图片...")
    }, to: url, method: .post) // 明确指定POST方法
    .uploadProgress { progress in
        print("上传进度: \(progress.fractionCompleted)")
    }
    .responseJSON { response in
        debugPrint(response) // 打印服务器响应
        switch response.result {
        case .success(let json):
            print("上传成功，服务器响应: \(json)")
        case .failure(let error):
            print("上传失败: \(error)")
        }
    }
}

// 示例调用
// let imageUrl = URL(string: "http://your-server.com/upload.php")!
// let myImage = UIImage(named: "yourImageName")! // 替换为你的图片
// uploadImage(image: myImage, to: imageUrl)

<?php

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

$response = array(); // 初始化响应数组

// 检查是否有文件上传，并且上传的字段名为 'image'
if (empty($_FILES["image"])) {
    $response["error"] = "nodata";
    $response["message"] = "未收到任何图片数据。请确保客户端以 'image' 为字段名上传。";
} else {
    // 检查上传过程中是否有错误
    if ($_FILES["image"]["error"] !== UPLOAD_ERR_OK) {
        $response["status"] = "Failure";
        $response["error_code"] = $_FILES["image"]["error"];
        $response["message"] = "文件上传失败，错误代码: " . $_FILES["image"]["error"];
        // 详细错误解释 (可选)
        switch ($_FILES["image"]["error"]) {
            case UPLOAD_ERR_INI_SIZE:
            case UPLOAD_ERR_FORM_SIZE:
                $response["message"] .= " (文件大小超出PHP配置限制)";
                break;
            case UPLOAD_ERR_PARTIAL:
                $response["message"] .= " (文件只有部分被上传)";
                break;
            case UPLOAD_ERR_NO_FILE:
                $response["message"] .= " (没有文件被上传)";
                break;
            case UPLOAD_ERR_NO_TMP_DIR:
                $response["message"] .= " (找不到临时文件夹)";
                break;
            case UPLOAD_ERR_CANT_WRITE:
                $response["message"] .= " (文件写入失败)";
                break;
            case UPLOAD_ERR_EXTENSION:
                $response["message"] .= " (PHP扩展停止了文件上传)";
                break;
        }
    } else {
        // 定义文件保存路径
        // 注意：D:/emailback/images/ 是Windows路径示例，请根据你的服务器环境调整
        // 确保该目录存在且PHP有写入权限
        $uploadDir = "D:/emailback/images/"; // 请根据你的实际情况修改
        // 确保目录以斜杠结尾
        if (substr($uploadDir, -1) !== '/') {
            $uploadDir .= '/';
        }

        // 获取客户端上传的文件名，并进行安全处理，防止路径遍历攻击
        $filename = basename($_FILES["image"]["name"]);
        $targetPath = $uploadDir . $filename;

        // 检查目标目录是否存在，如果不存在则尝试创建
        if (!is_dir($uploadDir)) {
            if (!mkdir($uploadDir, 0755, true)) { // 0755 是推荐的目录权限
                $response["status"] = "Failure";
                $response["message"] = "无法创建上传目录: " . $uploadDir;
                echo json_encode($response);
                exit;
            }
        }

        // 将临时文件移动到目标路径
        if (move_uploaded_file($_FILES['image']['tmp_name'], $targetPath)) {
            $response["status"] = "success";
            $response["message"] = "文件上传成功";
            $response["filename"] = $filename;
            $response["filepath"] = $targetPath;
            $response["file_type"] = $_FILES["image"]["type"];
            $response["file_size"] = $_FILES["image"]["size"];
        } else {
            $response["status"] = "Failure";
            $response["message"] = "移动上传文件失败，请检查目录权限或路径是否正确。";
            $response["debug"] = array(
                "tmp_name" => $_FILES["image"]["tmp_name"],
                "target_path" => $targetPath,
                "is_writable" => is_writable($uploadDir) // 检查目录是否可写
            );
        }
    }
}

echo json_encode($response);

?>