I would like to know if you can create a local geodatabase and perform editing to save in local geometries created.
The ArcGIS Runtime API for iOS supports offline editing. You can download features from a sync-enabled feature service and store them in a replica geodatabase on the device. Then you can view and edit these features.
You can find a sample for Offline Feature Editing at arcgis-runtime-samples-ios/OfflineFeatureEditingSample at master · Esri/arcgis-runtime-samples-ios · GitHub
Retrieving data ...