先介绍一下背景啊，本人是一名从业2.5年+的IOS开发工程师。平时喜欢搞点小研究，技术上虽然跟大牛们差很远，但是个人觉得写点对别人有帮助的文章也不是什么坏事。这篇文章主要是为了一些不了解图片上传的过程的同学们准备的，之前好几个群友都提到了使用AFNetWorking上传图片不了解是什么过程。可能都是从网上Copy过来的代码，所以不是很清楚流程才导致的不知道该在哪里写什么参数。设置什么参数。下面我就跟大家分享一下。使用Web和AFNetWorking的上传过程。两个前台的代码加上一个PHP后台的代码我想大家会足够明白图片的上传流程了。这就是我举两个例子的原因了，对比着看或许更加事半功倍吧。
首先先从Web上传图片开始说起。贴段代码解释一下吧。
<html><head><meta charset="UTF-8"> <title> Upload Picture. </title></head><body><form action="handle.php" name="form" method="post" enctype="multipart/form-data"> <input type="file" name="fileData" /> <input type="submit" name="submit" value="上传" /></form></body></html>
分析一下上面的代码，其实没有什么可以说的懂html的都知道。是一个提交表单。要点：method=”post” ：设置HTTP请求方式为POST请求enctype=”multipart/form-data” ：这个是一个需要了解的地方multipart/form-data这个值用于支持向服务器发送二进制数据。这个大家是不是看着感觉似曾相识的感觉呢? AFMultipartFormData协议，这个肯定不陌生了吧。其实AFMultipartFormData协议的作用就等价于multipart/form-data这个了。刚好提到AFMultipartFormData这个协议，那么下面我贴上另外的AFNetWorking上传图片的代码吧。大家都知道，由于IOS不能像Web那样通过提交表单来上传数据，那么我们只能通过HTTP请求来提交数据。代码如下
UIImage *image = [UIImage imageNamed:@"测试图片.jpg"]; NSData *data = UIImageJPEGRepresentation(image, 1.0); AFHTTPSessionManager *session = [AFHTTPSessionManager manager]; [session POST:@"图片上传接口" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> _Nonnull formData){ [formData appendPartWithFileData :data name:@"fileData" fileName:@"图片名称.jpg" mimeType:@"image/jpeg"]; } progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id _Nonnull responseObject){ } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error){ }]; 到这里大家一定会发现有点神似并且会有一个共同的地方。就是共同都用到了fileData这个参数。没有错，代码先做了个POST请求，然后使用此协议起到了类似Web提交表单中图片的作用。POST:parameters:constructingBodyWithBlock: 此方法为AFNetWorking中自带方法。百度查一下即可。
前面我介绍了那么多前段的操作，下面我们来看下服务器端怎么来接收图片。以PHP后台为例子了。简单的写了个PHP上传图片的后台。
<?php header('Content-Type:text/json; charset=utf-8'); $file = $_FILES['fileData']; $name = $file['name']; $type = strtolower(substr($name,strrpos($name,'.')+1)); $allow_type = array('jpg','jpeg','gif','png'); if(!in_array($type, $allow_type)){ return ; } if(!is_uploaded_file($file['tmp_name'])){ return ; } $upload_path = "./"; if(move_uploaded_file($file['tmp_name'],$upload_path.$file['name'])){ $array = array( 'code' => 'success' ); echo json_encode($array); }else{ $array = array( 'code' => 'fail' ); echo json_encode($array); }?> 大家是不是又发现了什么？$_FILES[‘fileData’]没错，就是这个了用来获取表单中name为fileData的二进制图片数据。获取到这张图片数据之后将图片保存至服务器。至此为图片上传至服务器的全部流程了。
可能写的不是那么好，不是那么有价值。但是个人感觉还是很实用，希望不喜勿喷。
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