1         /**
 2          *  代码演示
 3          */
 4         //*******UIImagePNGRepresentation(UIImage* image) 要比UIImageJPEGRepresentation(UIImage* image, 1.0) 返回的图片数据量大很多,但从视角角度看,图片的质量没有明显的降低,所以在读取图片数据内容时,可以先使用UIImageJPEGRepresentation，且耗时短。
 5         //******将选中的图片压缩成二进制文件*******photo为UIImage实例
 6         NSData *data = http://www.mamicode.com/UIImageJPEGRepresentation(photo, 0.5);
 7         //****** 从本地上传图片  先读入沙盒目录
 8          //****** 创建沙盒目录
 9         NSString *docomentpaths = [NSHomeDirectory() stringByAppendingPathComponent:@"docomentpaths"];
10         NSFileManager *manager = [NSFileManager defaultManager];
11         [manager createDirectoryAtPath:docomentpaths withIntermediateDirectories:YES attributes:nil error:nil];
12         //*****获取当前时间字符
13         NSString *timeStr = [NSString stringWithFormat:@"%@",[NSDate date]];
14         //*****读入沙盒目录下
15         [manager createFileAtPath:[docomentpaths stringByAppendingString:[NSString stringWithFormat:@"%@",timeStr]] contents:data attributes:nil];
16         //*****得到图片路径
17         NSString *filepath = [[NSString alloc]initWithFormat:@"%@%@",docomentpaths,timeStr];
18          //****** 得到本地的图片URL
19         NSURL *imageurl = [NSURL fileURLWithPath:filepath];
20         

 1  //****url服务器接口地址
 2     //使用AFN网络框架上传
 3     self.manager = [AFHTTPRequestOperationManager manager];
 4     [self.manager POST:url parameters:dic constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
 5         //         开始上传 formData提交
 6            [formData appendPartWithFileURL:imageurl name:@"ios_uploadImage" fileName:filepath mimeType:@"image/jpeg" error:nil];
 7                  }
 8 
 9         //      这里上传多张图片for循环提交
10         //        for (int i = 0; i<self.imagelist.count; i++)
11         //         {
12         //             [formData appendPartWithFileURL:self.iamgedata[i] name:@"heareuy" fileName:self.strlist[i] mimeType:@"image/jpeg" error:nil];
13         //         }
14         //
15         
16     } success:^(AFHTTPRequestOperation * _Nonnull operation, id  _Nonnull responseObject) {
17         
18     } failure:^(AFHTTPRequestOperation * _Nullable operation, NSError * _Nonnull error) {
19         
20     }];