This sample demonstrates how you to change renderer of a sublayer in map image layer.
How it works
Tap on the `Apply renderer` button to apply a class breaks renderer based on population for each county. Tap on the `Reset` button to reset to original renderer.
The mapImageSublayers property on AGSArcGISMapImageLayer is used to get the Counties sublayer of type AGSArcGISMapImageSublayer. A new class breaks renderer is set on the sublayer via renderer property.