Question

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Methods with multiple arguments in objective C

I’m very new to Objective-C I was learning the language by following tutorials online, In one particular tutorial colons(:) used after one another in a method header.

Here’s what I’m talking about:

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation

Can anyone tell me what this method’s header represents?

Here’s the tutorial: http://www.appcoda.com/how-to-get-current-location-iphone-user/

I’m a C++ programmer so if you can explain it to me by writing the same code in C++ that would be really helpful.

Thanks!

Answer 1

- (void)locationManager:(CLLocationManager *)manager 
    didUpdateToLocation:(CLLocation *)newLocation 
           fromLocation:(CLLocation *)oldLocation;

The above method is taking 3 aruguments as manager, newLocation, oldLocation of type CLLocationManager, CLLocation, CLLocation respectively.

In C++ or C, it would be something like this :

void locationManager(CLLocationManager *manager, CLLocation *newLocation, CLLocation *oldLocation);