topic Re: How to get AGSNMEALocation from AGSNMEALocationDataSource in ArcGIS Runtime SDK for iOS Questions

How to get AGSNMEALocation from AGSNMEALocationDataSource

WyattHarrell — Mon, 10 May 2021 17:13:48 GMT

I am attempting to use the initializer initWithEAAccessory:protocol: and the locationDataSource:locationDidChange: method for the AGSNMEALocationDataSource.

The documentation for AGSNMEALocationDataSource states that “the locationDataSource:locationDidChange: (AGSLocationChangeHandlerDelegate-p) method will return an AGSNMEALocation,” but after conforming to the AGSNMEALocationDataSourceDelegate the method actually returns a AGSLocation instead.

How can I access the AGSNMEALocation?

class SomeClassName: AGSLocationChangeHandlerDelegate { func locationDataSource(_ locationDataSource: AGSLocationDataSource, locationDidChange location: AGSLocation) { // This delegate method gives back an AGSLocation instead of the needed AGSNMEALocation as stated in the documentation } }

Re: How to get AGSNMEALocation from AGSNMEALocationDataSource

Ting — Mon, 10 May 2021 17:35:59 GMT

Hi Wyatt,

You can safely downcast the `AGSLocation` type to `AGSNMEALocation` with

```swift

guard let nmeaLocation = location as? AGSNMEALocation else { return }

```

Reason:

The NMEA delegate method inherits from the `AGSLocationChangeHandlerDelegate`... But I'll let our team know that the API design here is a bit confusing, and maybe we can add another `AGSNMEALocation` specific stub in the delegate.

References:

- Sample code

- AGSNMEALocation

- AGSNMEALocationDataSourceDelegate

Re: How to get AGSNMEALocation from AGSNMEALocationDataSource

WyattHarrell — Mon, 10 May 2021 17:28:32 GMT

Thank you so much, I appreciate the help.