问题
Is it possible to encode CGPathRef variables? I mean is there an encodeObject:forKey like method for CGPathRef variables?
回答1:
yes, there is - I have done this: https://github.com/mro/MROGeometry/blob/master/NSCoder_MROCGPath.m
回答2:
CGPaths are objects, but I don't think you can encode them—at least, if you can, it's not documented. You'll need to generate a saveable representation of the path yourself, and encode that, and then, when you decode that representation, reincarnate the path from it yourself.
回答3:
This header on Github has two utility strings to interchange CGPaths with NSStrings:
+(nullable NSString*) svgPathFromCGPath:(CGPathRef)aPath;
+(nullable CGPathRef) newCGPathFromSVGPath:(NSString*)anSVGPath whileApplyingTransform:(CGAffineTransform)aTransform;
You can use those strings with NSCoders to store things away. Be warned that anytime you convert between paths and strings you might lose significant digits because of the conversion.
I wrote these routines and they are under MIT license.
来源：https://stackoverflow.com/questions/1429426/cgpathref-encoding