With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more. Start Free Trial No credit card required. Note Although reverse geocoding was provided in the Map Kit framework by the now deprecated MKReverseGeocoder class, before the arrival of iOS 5, there was no forward geocoding capabilities offered natively by the SDK.
Location and Maps Programming Guide
Topics Reverse Geocoding a Location. CLGeocode Completion Handler Submits a reverse-geocoding request for the specified location and locale. Geocoding an Address. CLGeocode Completion Handler Submits a forward-geocoding requesting using the specified address string and locale information.
CLGeocode Completion Handler Submits a forward-geocoding request using the specified string and region information. CLGeocode Completion Handler Submits a forward-geocoding requesting using the specified Contacts framework information. CLGeocode Completion Handler Submits a forward-geocoding requesting using the specified locale and Contacts framework information. Any], completion Handler: CLGeocode Completion Handler Submits a forward-geocoding request using the specified address dictionary. Managing Geocoding Requests. Bool A Boolean value indicating whether the receiver is in the middle of geocoding its value.
CLGeocoder - Core Location | Apple Developer Documentation
Relationships Inherits From. Conforms To. CVar Arg.
See Also Geocoding. We also create an action, which is invoked when the user taps the button. This action validates the input and starts the geocoding operation. We leave the implementation empty for now. The user interface is basic. Don't forget to connect the outlets and the action we created earlier. We only want to start a geocoding operation if the user's input is valid. This means that the latitude and longitude need to be valid numbers.
We only have one option to reverse geocode the coordinates the user entered in the text fields. This method accepts a location, a CLLocation instance, and a completion handler. The completion handler accepts two arguments, an optional array of CLPlacemark instances and an optional Error instance.
In the completion handler, we invoke a helper method that processes the results of the geocoding operation. Remember from the previous tutorial that we need to import the Core Location framework, create a CLGeocoder instance, and implement the processResponse withPlacemarks: At the top of ReverseGeocodingViewController.
Below the outlets we declared earlier, declare a lazy property, geocoder , of type CLGeocoder. The implementation of processResponse withPlacemarks: The main difference is that we are interested in the CLPlacemark instance itself, not its location property. Remember, it is possible that we don't receive any results from the web service the Core Location framework talks to.
In that scenario, we display a message to the user. We are only interested in the first item.