iOS multi-image upload

began to learn Objc20 many days, recently in a lot of file upload, found some code on the Internet, just a single file, tossing for two days, and finally changed into a multi-file upload.
Xcode 6.1
IOS 8.0 Test Succeeded
I hope other people don't take the time to change as I do. Time is life.

+ (NSString *) Postimagestoserver: (NSString *) strURL dicpostparams: (nsmutabledictionary *) params dicimages: (            Nsmutabledictionary *) dicimages{NSString * RES;    The identifier of the dividing line nsstring *twitterfon_form_boundary = @ "aab03x"; Request//nsmutableurlrequest* request = [Nsmutableurlrequest Requestwithurl:[nsurl Urlwithstring:strurl] based on URL initialization        Cachepolicy:nsurlrequestreloadignoringlocalcachedata Timeoutinterval:10];    Nsurl *url = [Nsurl Urlwithstring:strurl];    Nsmutableurlrequest *request = [Nsmutableurlrequest Requestwithurl:url];    Dividing line--aab03x nsstring *mpboundary=[[nsstring alloc]initwithformat:@ "--%@", twitterfon_form_boundary];    Terminator aab03x--nsstring *endmpboundary=[[nsstring alloc]initwithformat:@ "%@--", mpboundary];    Images to upload UIImage *image;//=[params objectforkey:@ "pic"];    Get the image data//nsdata* data = uiimagepngrepresentation (image);    HTTP body string nsmutablestring *body=[[nsmutablestring alloc]init]; The collection of all keys for the collection of parameters Nsarray *keys= [params allKeys];        Traverse keys for (int i=0;i<[keys count];i++) {//Get current key nsstring *key=[keys objectatindex:i]; If key is not a pic, it indicates that value is a character type, such as Name:boris//if (![            Key isequaltostring:@ "pic"]) {//Add dividing line, newline [body appendformat:@ "%@\r\n", mpboundary];            Add field name, change 2 lines [Body appendformat:@ "content-disposition:form-data; name=\"%@\ "\r\n\r\n", key];            [Body appendstring:@ "content-transfer-encoding:8bit"];        Add the value of the field [body appendformat:@ "%@\r\n", [params objectforkey:key]];        }}////add dividing line, newline//[body appendformat:@ "%@\r\n", mpboundary];    Declaration Myrequestdata, used to put the HTTP body nsmutabledata *myrequestdata=[nsmutabledata data];        Converts the body string to UTF8 format binary [myrequestdata appenddata:[body datausingencoding:nsutf8stringencoding];    Loop add upload image keys = [Dicimages AllKeys]; for (int i = 0; i< [keys Count]; i++) {//picture to upload image = [Dicimages objectforKey:[keys Objectatindex:i]];        Get the image of data nsdata* data = uiimagejpegrepresentation (image, 0.0);        nsmutablestring *imgbody = [[Nsmutablestring alloc] init]; Here loop add picture file//Add picture information Field//Declaration pic field, file name Boris.png//[body appendformat:[nsstring stringwithformat: @ "Co Ntent-disposition:form-data; Name=\ "File\";                Filename=\ "%@\" \ r \ n ", [Keys objectatindex:i]];        Add dividing line, newline [imgbody appendformat:@ "%@\r\n", mpboundary]; [Imgbody appendformat:@ "content-disposition:form-data; name=\" file%d\ "; filename=\"%@.jpg\ "\ r \ n", I, [keys        OBJECTATINDEX:I]];                Declare the format of the uploaded file [imgbody appendformat:@ "Content-type:application/octet-stream; charset=utf-8\r\n\r\n"];                NSLog (@ "uploaded images:%d%@", I, [Keys objectatindex:i]);        Converts the body string to UTF8 format binary//[myrequestdata appenddata:[body datausingencoding:nsutf8stringencoding]]; [Myrequestdata appenddata:[imgbody datausingencoding:nsutf8stringencoding];       Add the data of image to [Myrequestdata Appenddata:data];    [Myrequestdata appenddata:[@ "\ r \ n" datausingencoding:nsutf8stringencoding]];    }//Declaration terminator:--aab03x--nsstring *end=[[nsstring alloc]initwithformat:@ "%@\r\n", endmpboundary];        Join Terminator--aab03x--[Myrequestdata appenddata:[end datausingencoding:nsutf8stringencoding]; Set the value of Content-type in Httpheader nsstring *content=[[nsstring alloc]initwithformat:@ "Multipart/form-data; boundary=%@    ", Twitterfon_form_boundary];    Set httpheader [Request Setvalue:content forhttpheaderfield:@ "Content-type"];    [Request setvalue:@ "keep-alive" forhttpheaderfield:@ "Connection"];    [Request setvalue:@ "UTF-8" forhttpheaderfield:@ "Charsert"]; Set content-length [Request Setvalue:[nsstring stringwithformat:@ "%lu", (unsigned long) [Myrequestdata Length]]    forhttpheaderfield:@ "Content-length"];    Set HTTP body [request Sethttpbody:myrequestdata];        HTTP method [Request sethttpmethod:@ "POST"]; Establish a connection, set proxy//nsurlconnection *conn = [[Nsurlconnection alloc] initwithrequest:request delegate:self];    Set the data NSData *mresponsedata that accepts response;    Nserror *err = nil;        Mresponsedata = [Nsurlconnection sendsynchronousrequest:request returningresponse:nil error:&err];    if (Mresponsedata = = nil) {NSLog (@ "Err Code:%@", [err localizeddescription]);    } res = [[NSString alloc] Initwithdata:mresponsedata encoding:nsutf8stringencoding];        /* IF (conn) {mresponsedata = [nsmutabledata data];                Mresponsedata = [Nsurlconnection sendsynchronousrequest:request returningresponse:nil error:&err];        if (Mresponsedata = = nil) {NSLog (@ "Err Code:%@", [err localizeddescription]);    } res = [[NSString alloc] Initwithdata:mresponsedata encoding:nsutf8stringencoding];    }else{res = [[NSString alloc] init];    }*/NSLog (@ "Server return:%@", res); return res;}

iOS multi-image upload