1.ios afnetworking

NSData *imageData = UIImageJPEGRepresentation(_selectImage,0.5);
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
[manager POST:@"https://wuxueying.xyz/jiesanbao/uploadImage.php" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
    [formData appendPartWithFileData:imageData name:@"file" fileName:@"big.jpg" mimeType:@"image/jpg"];
} success:^(NSURLSessionDataTask * _Nonnull task, id  _Nonnull responseObject) {
    NSLog(@"%@",responseObject);
} failure:^(NSURLSessionDataTask * _Nonnull task, NSError * _Nonnull error) {
    
}];

resize

- (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}

2.php

<?php
header('Content-type: text/json; charset=UTF-8' );
if (($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/png")
|| ($_FILES["file"]["type"] == "image/pjpeg")
|| ($_FILES["file"]["type"] == "image/jpg")) {
    if ($_FILES["file"]["error"] > 0) {
        echo $_FILES["file"]["error"];
    } else {
        $fillname = $_FILES['file']['name']; // 得到文件全名
        $dotArray = explode('.', $fillname); // 以.分割字符串，得到數組
        $type = end($dotArray); // 得到最后一個元素：文件后綴
        $path = md5(uniqid(rand())).'.'.$type; // 產生隨機唯一的名字
        move_uploaded_file( // 從臨時目錄復制到目標目錄
          $_FILES["file"]["tmp_name"], // 存儲在服務器的文件的臨時副本的名稱
          "images/".$path);
        $str = array("retcode" => "1","imageUrl" => $path);
        echo json_encode(array("url" => $path));
    }
} else {
}
?>

3. Postscript

any question comment below,i will response you.