Lag while drawing in ios7

Question

I am having an app in which I am doing some sketching on a view.

So far, it was working fine until I installed ios7.

My app uses touches moved met

Answer 1

To find a instant solution, Replace this line

 mainImage.image = UIGraphicsGetImageFromContext(UIGraphicsGetCurrentContext());

with

[mainImage performSelectorInBackground:@selector(setImage:) withObject:UIGraphicsGetImageFromCurrentImageContext()];

If you need an elaborate and accurate solution try to replace the MoveTo with CGMutablepath . Hope this helps.