Nathan Day
Nathan Day
I am guess this has got to do with WhiteColorSpace versus RGBColorSpace. Using [UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:1.0] fixes the issue.
Using CALayer will allow you to rotate the knob quicker, should also use it when just moving the knob without necessarily rotating it.
This means we need to cache for multiple angles, we could add a method to specify the number of division, could maybe get away with just 90° in some situation,...
This would mean the knob would not jump to the touch point.
You can get around this by making the base bigger and not drawing i the excess area, but it would be better if you didn't have to.
Some uses may want to use images created by graphic artists, instead of the images generated by core graphics.
Simple processing could potential be performed on the cached image without adding to much of a performance issue, for example shadows, tinting scaling.
Options to turn of caching or ratite cached image.