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How to Call drawRect programmatically in objective c

Answer 1

+2 A:

ohho 2010-05-04 10:43:40

Thanks for answer. But setNeedsDisplay will call only if the view is visible. In my condition view will not be visible. Sorry. my question was misleading. i have edited my question

Sijo 2010-05-04 10:55:36

Answer 2

A:

setNeedsDisplayInRect:

Williham Totland 2010-05-04 10:52:05

Answer 3

+1 A:

[myView display];

Forces the view to draw itself straight away.

[myView setNeedsDisplay: YES];

Forces the view to redraw on the next event loop cycle.

However, if you need to call it even when it is not visible, I think there is something wrong with the design of your view class. You should only be doing drawing inside drawRect: not anything else. And if you are only doing drawing why do it when the view is not visible?

JeremyP 2010-05-04 12:57:07

There's a case where you do want to render it off screen, and that is when you intend to use the view's content (e.g. take a screenshot of it, or such) and cache or use it elsewhere. In my case, I want to take a screenshot of a view that isn't necessarily seen by the user and save that view's image to disk.

Kalle 2010-10-25 17:06:09

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How to Call drawRect programmatically in objective c

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