ios: Compare NSString to "<null>" not working
ios, json, nsstring, null
Solution
I am consuming a web service that returns JSON. One of the values I get is "< null >"
Aha. Two possibilities:
I. The JSON doesn't contain latitude and longitude information. In this case, the keys for them aren't present in the dictionary you're getting back, so you are in fact obtaining a `nil` (or `NULL`) pointer. As messaging `nil` returns zero, both conditions will fire (due to the negation applied). Try this instead:
if (latitude != nil && longitude != nil)
and never rely on the description of an object.
II. Probably the JSON contains `null` values, and the JSON parser you're using turns `null` into `[NSNull null]`, and in turn you're trying to compare a string against that `NSNull`. In this case, try this:
if (![latitude isEqual:[NSNull null]] && ![longitude isEqual:[NSNull null]])
Problem
I am consuming a web service that returns JSON. One of the values I get is `"< null >"`. When I run the follwoing code the if statment still get executed when it is not suppposed to. Any reason why? ``` NSDictionary *location = [dictionary valueForKey:@"geoLocation"]; //get the product name NSString *latitude = [location valueForKey:@"latitude"]; NSLog(@"%@", latitude); NSString *longitude = [location valueForKey:@"longitude"]; if (![latitude isEqual: @"<null>"] && ![longitude isEqual: @"<null>"]) { NSLog(@"%d", i); CLLocationCoordinate2D coordinate; coordinate.longitude = [latitude doubleValue]; coordinate.longitude = [longitude doubleValue]; [self buildMarketsList:coordinate title:title subtitle:nil]; //build the browse list product } ```