How to change data from a raster field to UIImage?

Question

AGSGraphic *resultGraphic = self.identifyResult.feature;
NSData *imageData = (NSData *)[resultGraphic.attributes objectForKey:@imageObject]; 
UIImage *image = [UIImage imageWithData:imageData];

I have tried something like the code above but no luck so far. Does anyone has a solution for this? Many thanks!

NicholasLeung · Answer

Thanks for your reply. Seems I have to go for a web service solution then.

DiveshGoyal · Answer

The ArcGIS Server REST API does not support raster fields. Consequently, you cannot access the information in such fields using ArcGIS API for iOS.