CLLocation, geocoder and region search - ios

Question

I have problem with narrowing the Geocoder result. Here is my code:
CLLocationCoordinate2D centerLocation = CLLocationCoordinate2DMake(53, 10);
CLCircularRegion *region = [[CLCircularRegion alloc] initWithCenter: centerLocation radius:100 identifier:#"de"];
[self.geocoder geocodeAddressString:[NSString stringWithFormat:#"%#%#",textField.text,string] inRegion:region
completionHandler:^(NSArray* placemarks, NSError* error){
//filling the tableView code
}];
From apple docs:
"Specifying a region lets you prioritize the returned set of results
to locations that are close to some specific geographical area"
But if i start tapping the nearest street name i get results from all over the world but not the street i want. I need to put entire street name in the field to get in in placemarks array. How can I get nearest-first result from geocoder?
EDIT:
I don't know if address is a street, postcode, city name or place name. The bahavior is similar to Map app where there is only one textfield to search in all places.

Answer 1

"if i start tapping the nearest street name"
It looks like to me you’re doing a search based on user-entered query. You should use MKLocalSearch from Map Kit to perform searches for locations that a user can describe by name, address or type. Geocoding is used to convert map coordinates to a structured address or vice versa.
To quote the documentation:
Although local search and geocoding are similar, they support
different use cases. Use geocoding when you want to convert between
map coordinates and a structured address, such as an Address Book
address. Use local search when you want to find a set of locations
that match the user’s input.
For example:
MKLocalSearchRequest *request = [MKLocalSearchRequest new];
request.naturalLanguageQuery = #"saint";
request.region = MKCoordinateRegionMakeWithDistance(CLLocationCoordinate2DMake(48.850354, 2.337341), 500, 500);
MKLocalSearch *search = [[MKLocalSearch alloc] initWithRequest:request];
[search startWithCompletionHandler:^(MKLocalSearchResponse *response, NSError *error) {
for (MKMapItem *item in response.mapItems) {
NSLog(#"item.placemark.name = %#", item.placemark.name);
}
}];
And I would get the following results which are correct based on the region i specified:
item.placemark.name = Eglise Saint Sulpice
item.placemark.name = J'Go Saint Germain
item.placemark.name = Terrazza Saint Germain
item.placemark.name = Hôtel Odéon Saint Germain
item.placemark.name = Le Bon Saint Pourcain
item.placemark.name = Hotel Le Relais Saint Germain
item.placemark.name = Piscine Saint Germain
item.placemark.name = Bistrot de la Grille Saint Germain
item.placemark.name = Esprit Saint Germain
item.placemark.name = Hôtel Relais Saint Sulpice
Then, you're free to do anything you want with the results you get.