镔哥哥就直接上代码了，上次一个朋友问我，能不能多点注释，我想对你说，看人代码主要是理解方法的演变，不懂就直接找度娘，并且我写的注释也不少啊。

注意：请不要直接负责代码，最好自己写一遍。

//

//  RequestPostUploadHelper.h

//  上传图片方法类

//

//  Created by apple on 14/12/13.

//  Copyright (c) 2014年 huweibin. All rights reserved.

//

#import <Foundation/Foundation.h>

#import <UIKit/UIKit.h>

@interface RequestPostUploadHelper : NSObject

/**

 *POST 提交并可以上传图片目前只支持单张

 */

/*

 postParems提交参数据集合

 picFilePath上传图片路径

 picFileName上传图片名称

 */

+(NSString *)postRequestWithURL:(NSString *)url postParems:(NSMutableDictionary *)postParems picFilePath:(NSString *)picFilePath picFileName:(NSString *)picFileName;

/*

   图片大小

 */

+ (UIImage *) imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize) newSize;

/**

 * 保存图片

 */

+ (NSString *)saveImage:(UIImage *)tempImage WithName:(NSString *)imageName;

/**

 * 生成GUID

 */

+ (NSString *)generateUuidStrin;

@end

//

//  RequestPostUploadHelper.m

//  上传图片方法类

//

//  Created by apple on 14/12/13.

//  Copyright (c) 2014年 youdianshang. All rights reserved.

//

#import "RequestPostUploadHelper.h"

@implementation RequestPostUploadHelper

static NSString *const FORM_FLE_INPUT = @"file";

+(NSString *)postRequestWithURL:(NSString *)url postParems:(NSMutableDictionary *)postParems picFilePath:(NSString *)picFilePath picFileName:(NSString *)picFileName

{

    NSString * TWITTERFON_FORM_BOUNDARY = @"0xKhTmLbOuNdArY";

    //根据url初始化request

    NSMutableURLRequest* request = [NSMutableURLRequestrequestWithURL:[NSURLURLWithString:url]cachePolicy:NSURLRequestReloadIgnoringLocalCacheData

    timeoutInterval:10];

    //分界线 --AaB03x

    NSString *MPboundary=[[NSStringalloc]initWithFormat:@"--%@",TWITTERFON_FORM_BOUNDARY];

    //结束符 AaB03x--

    NSString *endMPboundary=[[NSStringalloc]initWithFormat:@"%@--",MPboundary];

    //得到图片的data

    NSData* data;

    if(picFilePath){

        UIImage *image=[UIImageimageWithContentsOfFile:picFilePath];

        //判断图片是不是png格式的文件

        if (UIImagePNGRepresentation(image)) {

            //返回为png图像。

            data = http://www.mamicode.com/UIImagePNGRepresentation(image);

        }else {

            //返回为JPEG图像。

            data = http://www.mamicode.com/UIImageJPEGRepresentation(image,1.0);

        }

    }

    //http body的字符串

    NSMutableString *body=[[NSMutableStringalloc]init];

    //参数的集合的所有key的集合

    NSArray *keys= [postParems allKeys];

    //遍历keys

    for(int i=0;i<[keyscount];i++)

    {

        //得到当前key

        NSString *key=[keys objectAtIndex:i];

        //添加分界线，换行

        [body appendFormat:@"%@\r\n",MPboundary];

        //添加字段名称，换2行

        [body appendFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n",key];

        //添加字段的值

        [body appendFormat:@"%@\r\n",[postParemsobjectForKey:key]];

        NSLog(@"添加字段的值==%@",[postParemsobjectForKey:key]);

    }

    if(picFilePath){

        ////添加分界线，换行

        [body appendFormat:@"%@\r\n",MPboundary];

        //声明pic字段，文件名为boris.png

        [body appendFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"\r\n",FORM_FLE_INPUT,picFileName];

        //声明上传文件的格式

        [body appendFormat:@"Content-Type: image/jpge,image/gif, image/jpeg, image/pjpeg, image/pjpeg\r\n\r\n"];

    }

    //声明结束符：--AaB03x--

    NSString *end=[[NSStringalloc]initWithFormat:@"\r\n%@",endMPboundary];

    //声明myRequestData，用来放入http body

    NSMutableData *myRequestData=http://www.mamicode.com/[NSMutableDatadata];

    //将body字符串转化为UTF8格式的二进制

    [myRequestData appendData:[bodydataUsingEncoding:NSUTF8StringEncoding]];

    if(picFilePath){

        //将image的data加入

        [myRequestData appendData:data];

    }

    //加入结束符--AaB03x--

    [myRequestData appendData:[enddataUsingEncoding:NSUTF8StringEncoding]];

    //设置HTTPHeader中Content-Type的值

    NSString *content=[[NSStringalloc]initWithFormat:@"multipart/form-data; boundary=%@",TWITTERFON_FORM_BOUNDARY];

    //设置HTTPHeader

    [request setValue:contentforHTTPHeaderField:@"Content-Type"];

    //设置Content-Length

    [request setValue:[NSStringstringWithFormat:@"%lu", (unsignedlong)[myRequestDatalength]] forHTTPHeaderField:@"Content-Length"];

    //设置http body

    [request setHTTPBody:myRequestData];

    //http method

    [request setHTTPMethod:@"POST"];

    NSHTTPURLResponse *urlResponese = nil;

    NSError *error = [[NSErroralloc]init];

    NSData* resultData = http://www.mamicode.com/[NSURLConnectionsendSynchronousRequest:request   returningResponse:&urlResponese error:&error];

    NSString* result= [[NSStringalloc] initWithData:resultDataencoding:NSUTF8StringEncoding];

    if([urlResponese statusCode] >=200&&[urlResponese statusCode]<300){

        NSLog(@"返回结果=====%@",result);

        return result;

    }

    return nil;

}

/**

 * 保存图片

 */

+ (NSString *)saveImage:(UIImage *)tempImage WithName:(NSString *)imageName{

    NSData* imageData;

    //判断图片是不是png格式的文件

    if (UIImagePNGRepresentation(tempImage)) {

        //返回为png图像。

        imageData = http://www.mamicode.com/UIImagePNGRepresentation(tempImage);

    }else {

        //返回为JPEG图像。

        imageData = http://www.mamicode.com/UIImageJPEGRepresentation(tempImage,1.0);

    }

    NSArray* paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);

    NSString* documentsDirectory = [paths objectAtIndex:0];

    NSString* fullPathToFile = [documentsDirectorystringByAppendingPathComponent:imageName];

    NSArray *nameAry=[fullPathToFile componentsSeparatedByString:@"/"];

    NSLog(@"===fullPathToFile===%@",fullPathToFile);

    NSLog(@"===FileName===%@",[nameAryobjectAtIndex:[nameAry count]-1]);

    [imageData writeToFile:fullPathToFile atomically:NO];

    return fullPathToFile;

}

/**

 * 生成GUID

 */

+ (NSString *)generateUuidString{

    // create a new UUID which you own

    CFUUIDRef uuid =CFUUIDCreate(kCFAllocatorDefault);

    // create a new CFStringRef (toll-free bridged to NSString)

    // that you own

    NSString *uuidString = (NSString *)CFBridgingRelease(CFUUIDCreateString(kCFAllocatorDefault, uuid));

    // transfer ownership of the string

    // to the autorelease pool

    // release the UUID

    CFRelease(uuid);

    return uuidString;

}

@end

纯代码上传图片的类－－demo