Retrieving resultant data from blocks - objective-c-blocks

Question

-(void) ReverseGeocode
{
CLGeocoder *geocoder=[[CLGeocoder alloc]init];
[geocoder reverseGeocodeLocation:self.toLocation
completionHandler:^(NSArray *placemarks, NSError *error){
if(error){
NSLog(#"Geocode failed with error: %#",error);
return;
}
if(placemarks &&placemarks.count>0){
CLPlacemark *placemark=placemarks[0];
NSDictionary *addressDictionary=placemark.addressDictionary;
NSString *Address=[addressDictionary objectForKey:(NSString*)
kABPersonAddressStreetKey];
NSString *City=[addressDictionary objectForKey:(NSString*)
kABPersonAddressCityKey];
NSString *State=[addressDictionary objectForKey:(NSString*)
kABPersonAddressStateKey];
NSString *Zip=[addressDictionary objectForKey:(NSString*)
kABPersonAddressZIPKey];
NSString *adress=[NSString localizedStringWithFormat:#"%# %# %# %# %#",
Address,City,State,#"United States",Zip];
// return adress;
}
}];
}
Above is a method for ReverseGeocoding.
I am trying to retrieve the final result, NSString adress. How can I do that. I have many such methods where I need to retrieve the data.

Answer 1

- (void)reverseGeocodeWithCompletionHandler:(void (^)(NSString *address))completionHandler {
[geocoder reverseGeocodeLocation:self.toLocation
completionHandler:^(NSArray *placemarks, NSError *error){
if(error) {
NSLog(#"Geocode failed with error: %#",error);
completionHandler(nil);
} else if {
if(placemarks &&placemarks.count>0) {
//...
NSString *adress=[NSString localizedStringWithFormat:#"%# %# %# %# %#",
Address,City,State,#"United States",Zip];
completionHandler(address);
}
}];
}
Call this method like this:
[obj reverseGeocodeWithCompletionHandler:^(NSString *address) {
NSLog(#"Address is = %#", address);
}];