Querying an NSDictionary for values in an if/else statement - ios

Question

My parse cloud code function is setup to return data in the form of JSON, like so:
response.success
({
"results": [
{ "Number of top categories": top2.length },
{ "Top categories": top2 },
{ "Number of matches": userCategoriesMatchingTop2.length },
{ "User categories that match search": userCategoriesMatchingTop2 }
]
});
What I want to do is query this JSON array in my Objective-C code, and perform certain actions based on what's being returned, through the use of the if statement on the bottom. For example, where it says:
if ([result intValue] == 1){
[self performSegueWithIdentifier:#"ShowMatchCenterSegue" sender:self];
}
I want to replace result intValue with a statement that says the value of "Number of matches" from the JSON data is equal to 1.
- (IBAction)nextButton:(id)sender
{
if (self.itemSearch.text.length > 0) {
[PFCloud callFunctionInBackground:#"eBayCategorySearch"
withParameters:#{#"item": self.itemSearch.text}
block:^(NSString *result, NSError *error) {
NSLog(#"'%#'", result);
NSData *returnedJSONData = result;
NSError *jsonerror = nil;
NSDictionary *categoryData = [NSJSONSerialization
JSONObjectWithData:returnedJSONData
options:0
error:&jsonerror];
if(error) { NSLog(#"JSON was malformed."); }
// validation that it's a dictionary:
if([categoryData isKindOfClass:[NSDictionary class]])
{
NSDictionary *jsonresults = categoryData;
/* proceed with jsonresults */
}
else
{
NSLog(#"JSON dictionary wasn't returned.");
}
if (!error) {
// if 1 match found clear categoryResults and top2 array
if ([result intValue] == 1){
[self performSegueWithIdentifier:#"ShowMatchCenterSegue" sender:self];
}
// if 2 matches found
else if ([result intValue] == 2){
[self performSegueWithIdentifier:#"ShowUserCategoryChooserSegue" sender:self];
//default to selected categories criteria -> send to matchcenter -> clear categoryResults and top2 array
}
// if no matches found, and 1 top category is returned
else if ([result intValue] == 2) {
[self performSegueWithIdentifier:#"ShowCriteriaSegue" sender:self];
}
// if no matches are found, and 2 top categories are returned
else if ([result intValue] == 2) {
[self performSegueWithIdentifier:#"ShowSearchCategoryChooserSegue" sender:self];
}
}
}];
}
}

Answer 1

From what I understand, the response JSON data that you get, is an array of dictionaries within a dictionary.
To retrieve each of those values, you may use the following steps:
Step 1:
Separate the array of dictionaries from the result dictionary into an NSArray object.
NSArray *resultArray = [resultDictionary objectForKey:#"results"];
Step 2:
Now that you have the resultArray, you can extract the values that you want as follows:
Suppose you want the value of NSNumber object "Number of matches",
You know that its the 3rd object in the resultArray, so its index is 2.
NSDictionary *dictionary = [resultArray objectAtIndex:2];
NSNumber *numberOfMatches = [dictionary objectForKey:#"Number of matches"];
Now you can use the [numberOfMatches intValue] wherever you want.
Hope this helps! :)