How To Remove Line in Core Graphics

问题

I draw a line using CGContextAddLineToPoint in my app now i want to remove line from given points how can i do this i am using touches for drawing line

回答1:

You can erase,

Given the two points, draw the line with same attributes(lineWidth etc.,) by setting the CGContextSetBlendMode(context, kCGBlendModeClear).

来源：https://stackoverflow.com/questions/10601691/how-to-remove-line-in-core-graphics