core graphics - iOS - Can UIGraphicsGetCurrentContext be used outside drawRect? -

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i want dynamically change current cgcontextref according different user actions? possible or modification possible within drawrect: of view instance? happens when call uigraphicsgetcurrentcontext() outside drawrect: , there limitations in doing so, recommended? possible implications need consider?

according docs graphics context set before function called. means if function not called won't set , if don't make system call again (never reason) won't there either.

use 1 of these functions force view drawrect:

setneedsdisplay: setneedsdisplayinrect:

it doesn't mean can stuff inside drawrect however. context sort of globally available @ moment , can call clean separate functions or classes drawing things. passing reference functions clean way it.


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