how to pass string as parameter in post method - ios

Question

I am new to IOS i need to know how to pass NSString as parameter in nsurlconnection POST method,i passed string but it become empty
viewdidload:
NSString *parseURL =#"http:url";
NSString *encodeurl =[parseURL stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *url = [NSURL URLWithString:encodeurl];
NSData *data = [NSData dataWithContentsOfURL:url];
if(data){
NSError *error;
NSDictionary *json1 = [NSJSONSerialization JSONObjectWithData:data options: kNilOptions error:&error];
arrMsg = [json1 valueForKeyPath:#"Branches.branch_name"];
arrmsg1 =[json1 valueForKeyPath:#"Branches.id"];
NSString *str = [arrmsg1 componentsJoinedByString:#","];
NSLog(#"%#",str);
[self sendDataToServer :#"POST"];
}
post method:
In post method i passed the string as parameter
-(void) sendDataToServer : (NSString *) method{
//NSString *str = [arrmsg1 componentsJoinedByString:#","];
NSString *post = [NSString stringWithFormat:#"branch_id=%#",str];
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:#"%lu", (unsigned long)[post length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:URL]];
[request setHTTPMethod:#"POST"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setHTTPBody:postData];
NSURLConnection *theConnection = [NSURLConnection connectionWithRequest:request delegate:self];
if( theConnection ){
// indicator.hidden = NO;
mutableData = [[NSMutableData alloc]init];
}
}

Answer 1

you can do like
arrMsg = [json1 valueForKeyPath:#"Branches.branch_name"];
arrmsg1 =[json1 valueForKeyPath:#"Branches.id"];
NSString *str = [arrmsg1 componentsJoinedByString:#","];
NSLog(#"%#",str);
// call the method like
[self sendDataToServer :#"POST" params:str];
// create the method like
-(void) sendDataToServer : (NSString *) method params:(NSString *)str{
NSString *post = [NSString stringWithFormat:#"branch_id=%#",str];
.... continue your work
}