AGSSketchGraphicsLayer eat up memory in SDK 10.2.2

Discussion created by lifenglibaoabc on Apr 28, 2014
Latest reply on Jun 9, 2014 by Yue_Wu-esristaff
I create AGSSketchGraphicsLayer and add to the MapView. It works well before
Today I upgrade the SDK to 10.2.2. It occupied nearly 1G when I create AGSSketchGraphicsLayer on App. Then it crashed because it received high memory warning.

How to solve it? 
Addition, my app has ARC on.
Thank you!