POST request not receiving all json - ios

Question

Little issue that's been bothering me. I've been making a POST request to my AWS RDB. The request should return a json output. The issue I'm having is that I'll receive bytes back, but sometimes it contains incomplete json, thus converting it to a dictionary won't work. Sometimes I also receive a null value for the nsdata received, but I can print out the length of the data. Any ideas? Here's my iOS code for requests:
#import "ServiceConnector.h"
#implementation ServiceConnector{
NSMutableData *receivedData;
}
-(void)getTest{
//Send to server
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:#"MY_WEBSITE"]];
[request setHTTPMethod:#"GET"];
//initialize an NSURLConnection with the request
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
if(!connection){
NSLog(#"Connection Failed");
}
}
-(void)postTest:(NSMutableArray *)carSearches{
//build up the request that is to be sent to the server
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:#"MY_WEBSITE"]];
[request setHTTPMethod:#"POST"];
NSError *writeError = nil;
NSData *data = [NSJSONSerialization dataWithJSONObject:carSearches options:NSJSONWritingPrettyPrinted error:&writeError];
NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(#"JSON Output: %#", jsonString);
[request setHTTPBody:data]; //set the data as the post body
[request addValue:[NSString stringWithFormat:#"%lu",(unsigned long)data.length] forHTTPHeaderField:#"Content-Length"];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
if(!connection){
NSLog(#"Connection Failed");
}
}
#pragma mark - Data connection delegate -
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{ // executed when the connection receives data
if(!receivedData){
receivedData = [[NSMutableData alloc]init];
[receivedData appendData:data];
}
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{ //executed when the connection fails
NSLog(#"Connection failed with error: %#",error);
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
NSLog(#"Request Complete,recieved %lu bytes of data",(unsigned long)receivedData.length);
NSString *tmp = [NSString stringWithUTF8String:[receivedData bytes]];
NSLog(#"%#",tmp);
NSError *error;
NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:[NSData dataWithBytes:[receivedData bytes] length:[receivedData length]] options:NSJSONReadingAllowFragments error:&error];
[self.delegate requestReturnedData:dictionary];
}

Answer 1

In this section:
if(!receivedData){
receivedData = [[NSMutableData alloc]init];
[receivedData appendData:data];
}
You are only appending data if the object hasn't been created yet. You want to append every time. That if statement should read like this:
if(!receivedData){
receivedData = [[NSMutableData alloc]init];
}
[receivedData appendData:data];