NSURL returning nil When Calling an API - ios

Question

I'm trying to call an API and bring back menu items. My string seems to contain data because when I put it into a browser, I'm getting JSON.
NSString *urlString = [NSString stringWithFormat:#"https://api.nutritionix.com/v1_1/search/subway?results=0%3A20&cal_min=0&cal_max=50000&fields=item_name%2Cbrand_name%2Citem_id%2Cbrand_id&appId=MY_APP_ID&appKey=MY_APP_KEY"];
NSURL *url = [NSURL URLWithString:urlString];
My "urlString" contains a lot of information, but when I put a breakpoint on the NSURL object, it says it returns "nil".
EDIT: Removed spaces however the error persists.
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setHTTPMethod:#"GET"];
[request setURL:[NSURL URLWithString:urlString]];
NSHTTPURLResponse *responseCode = nil;
NSError *error = [[NSError alloc] init];
NSData *ResponseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&responseCode error:&error];
NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:ResponseData options:kNilOptions error:nil];
itemName = dataDictionary[#"item_name"];
NSLog(#"%#", itemName);
EDIT: Added request code

Answer 1

Ok, I have found something interesting about your url
You just forgot about string format. Every percent sign cry to you: 'I want to be replaced with something you gain to me!'
So, to prevent such behavior, you need to hide every percent with another percent: %%
-(void)doNSURLTestOne{
NSString *urlString = [NSString stringWithFormat:#"https://api.nutritionix.com/v1_1/search/subway?results=0%%3A20&cal_min=0&cal_max=50000&fields=item_name%%2Cbrand_name%%2Citem_id%%2Cbrand_id&appId=MY_APP_ID&appKey=MY_APP_KEY"];
NSURL *url = [NSURL URLWithString:urlString];
NSLog(#"is url nil? %#", url);
NSLog(#"is urlString ok? %#", urlString);
}
But I prefer to use AFNetworking library for net part
UPD: better choice to use another clean NSString ( thanks #rmaddy )
-(void)doNSURLTestTwo{
NSString *urlString = #"https://api.nutritionix.com/v1_1/search/subway?results=0%3A20&cal_min=0&cal_max=50000&fields=item_name%2Cbrand_name%2Citem_id%2Cbrand_id&appId=MY_APP_ID&appKey=MY_APP_KEY";
NSURL *url = [NSURL URLWithString:urlString];
NSLog(#"is url nil? %#", url);
NSLog(#"is urlString ok? %#", urlString);
}