Looking for guidance on how to efficiently split my json - objective-c

Question

So I understand how to split the array that holds the JSON info, but what I am stuck on is trying to get it to display everything past only the first whitespace. For instance, if you look at the JSON site (http://iam.colum.edu/portfolio/api/course?json=True) each course has a course number at beginning. I want to split each array object only displaying the course name. For instance, if you look at the site, the first object is "Computer Architecture" second is "Digital Image and Design"... etc. I don't need to know how to split the string, I can already do that, but how do I split it so it takes away "xx-xxx " (x being the course number)? The code I have currently splits at each whitespace, but that's not going to work for obvious reasons.
JSONViewController
dispatch_async(progressQueue, ^{
jstring = [JSONHelper JSONgetString:#"http://iam.colum.edu/portfolio/api/course?json=True"];
dispatch_async(dispatch_get_main_queue(), ^{
//main thread code
//textView.text = jstring;
jarray = [jstring componentsSeparatedByString:#" "];
textView.text = [jarray objectAtIndex:1];
NSString * fullString = [NSString string];
for(int i = 0; i < jarray.count; i++)
{
fullString = [fullString stringByAppendingString:[jarray objectAtIndex:i]];
}
textView.text = fullString;
NSError *error = nil;
NSArray * resultArray = [NSJSONSerialization JSONObjectWithData: [jstring dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingMutableContainers error: &error];
if ( !resultArray ) {
NSLog(#"Error parsing JSON: %#", error);
} else {
for(NSString * course in resultArray) {
NSLog(#"Course: %#", course);
}
}
JSONHelper.h
#interface JSONHelper : NSObject
+ (NSDictionary *)JSONget:(NSString *)query;
+ (NSString *)JSONgetString:(NSString *)query;
+ (NSString *)JSONpostString:(NSString *)query;
+(NSString *)JSONpostString:(NSString *)query
withData:(NSString *)jsonData;
#end
JSONHelper.m
#implementation JSONHelper
//returns a dictionar from a get request
+ (NSDictionary *)JSONget:(NSString *)query
{
NSData *jsonData = [[NSString stringWithContentsOfURL:[NSURL URLWithString:query] encoding:NSUTF8StringEncoding error:nil] dataUsingEncoding:NSUTF8StringEncoding];
NSError *error = nil;
NSDictionary *results = jsonData ? [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error] : nil;
if (error) NSLog(#"[%# %#] JSON error: %#", NSStringFromClass([self class]), NSStringFromSelector(_cmd), error.localizedDescription);
return results;
}
//returns JSON string from get request
+(NSString *)JSONgetString:(NSString *)query
{
NSString* searchURL = [NSString stringWithFormat:query];
NSError* error = nil; //error for NSUSRLConnection
NSURLResponse* response = nil;
NSMutableURLRequest* request = [[NSMutableURLRequest alloc] init];
NSURL* URL = [NSURL URLWithString:searchURL];
[request setURL:URL];
[request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
[request setTimeoutInterval:30];
NSData* data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
if (error)
{
NSLog(#"Error performing request %#", searchURL);
return 0;
}
NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(#"jsonString:%#", jsonString);
return jsonString;
}
+(NSString *)JSONpostString:(NSString *)query{
NSString* searchURL = [NSString stringWithFormat:query];
NSError* error = nil;
NSURLResponse* response = nil;
NSMutableURLRequest* request = [[NSMutableURLRequest alloc] init];
NSURL* URL = [NSURL URLWithString:searchURL];
[request addValue: #"application/json" forHTTPHeaderField:#"Accept"];
[request addValue: #"application/json" forHTTPHeaderField:#"Content-Type"];
[request setHTTPMethod:#"POST"];
[request setURL:URL];
[request setTimeoutInterval:15];
NSData* data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
if (error)
{
NSLog(#"Error performing request %#", searchURL);
return 0;
}
NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(#"jsonString:%#", jsonString);
return jsonString;
}
+(NSString *)JSONpostString:(NSString *)query
withData:(NSString *)jsonData
{
NSString* searchURL = [NSString stringWithFormat:query];
NSError* error = nil;
NSURLResponse* response = nil;
NSMutableURLRequest* request = [[NSMutableURLRequest alloc] init];
NSURL* URL = [NSURL URLWithString:searchURL];
[request addValue: #"application/json" forHTTPHeaderField:#"Accept"];
[request addValue: #"application/json" forHTTPHeaderField:#"Content-Type"];
[request setHTTPMethod:#"POST"];
[request setURL:URL];
[request setTimeoutInterval:30];
NSData* requestData = [jsonData dataUsingEncoding:NSUTF8StringEncoding];
[request addValue:[NSString stringWithFormat:#"%d", [requestData length]] forHTTPHeaderField:#"Content-Length"];
[request setHTTPBody:requestData];
NSData* data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
if (error)
{
NSLog(#"Error performing request %#", searchURL);
return 0;
}
NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(#"jsonString:%#", jsonString);
return jsonString;
}
#end

Answer 1

NSDictionary *dictionary = [JSONHelper JSONget:#"http://iam.colum.edu/portfolio/api/course?json=True"];
for (id course in dictionary) {
NSLog(#"%#", [course substringFromIndex:8]);
}
As you can seen all those course number has the same pattern (so I assume that won't change) and it's xx-xxxx (7 character + whitespace after this). In that cas you can easily use substring fromthe index 8 (counting from 0).
Bu if you are still eager on how to do this in case when those course numbers may have various lengths yo can try using this solution:
NSDictionary *dictionary = [JSONHelper JSONget:#"http://iam.colum.edu/portfolio/api/course?json=True"];
for (id course in dictionary) {
NSArray *courseArray = [course componentsSeparatedByString:#" "];
NSMutableString *courseName = [NSMutableString string];
for (int i = 1; i < [courseArray count] ; i++) {
[courseName appendFormat:#"%# ", courseArray[i]];
}
// Deleting last character which is whitespace
[courseName substringToIndex:courseName.length -1];
NSLog(#"%#", courseName);
[courseName setString:#""];
}
It may not be the most efficent way to handle your problem but it just works!