using UIGraphicsGetCurrentContext in MarkerImage subclass

[mikaelhellqvist]

Hi Daniel,

thanks for an awesome library!

I've subclassed MarkerImage in order to show images where ever I want on the graph. I think this is the way to do it.

Although let context = UIGraphicsGetCurrentContext() always returns nil. Do you have any suggestions?

[liuxuan30]

Declaration
CGContextRef UIGraphicsGetCurrentContext(void);
Return Value
The current graphics context.

Discussion
The current graphics context is nil by default. Prior to calling its drawRect: method, view objects push a valid context onto the stack, making it current. If you are not using a UIView object to do your drawing, however, you must push a valid context onto the stack manually using the UIGraphicsPushContext function.

Check your class first.