Problem drawing polyline on Ipad.

Discussion created by ZachLiu on Nov 22, 2013
I am developing an app and it has drawtoolbar. Everything works fine except I have problems drawing polylines on Ipad.

I can draw the first point and the second point, but after that how many times I hit the screen, the previous second point will be deleted and the point I just drew became the second point.

Anyone knows what the problem is? is that a bug?