Weird anti-aliasing in custom view

Answer 1

in your view frames, you probably have float values that are not integers. While the frames are precise enough to do fractions of a pixel (float), you will get blurriness unless you cast to an int

CGRect frame = CGRectMake((int)self.frame.bounds..., (int)...., (int)...., (int)....);

Answer 2

Since a stroke expands equal amounts to both sides, a line of one pixel width must not be placed on an integer coordinate, but at 0.5 pixels offset.

Calculate correct coordinates for stroked lines like this:

CGPoint pos = CGPointMake(floorf(pos.x) + 0.5f, floorf(pos.y) + 0.5f);

BTW: Don't cast your values to int and back to float to get rid of the decimal part. There's a function for this in C called floor.