The RØDE SC6-L connects directly to your device's Lightning port and gives you two TRRS (3.5mm) inputs as well as a TRS (3.5mm) headphone output.
This allows you to conduct interviews with great quality audio, while independently setting the gain level of each microphone (using the RØDE Reporter app).
The SC6-L is designed to be paired with the RØDE smartLav+, and is also available in the Mobile Interview Kit which bundles the SC6-L with two smartLav+ microphones.