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Editorial Team
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Asked: 2026-05-28T00:00:31+00:00

I am trying to plot few points dynamically on my Custom View using Quartz

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I am trying to plot few points dynamically on my Custom View using Quartz functions so that i get a complete graph. I handle drawing of lines inside the drawRect method of Custom View where I get the current context and draw the lines. But, they get erased when i try to draw a new line. I want to have those lines also visible along with the new ones drawn. Please let me know how to do this. I can’t store all the points together and draw at the end. I want to continously update my view. Thanks in advance.

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1 Answer

  1. Editorial Team

    Add a method to your custom view:

    - (BOOL) isOpaque { return YES; }

    That will prevent the drawing of any views behind yours including the background.

    Note, however, that on resize you’ll need to redraw everything either way. A more proper solution would be to use off-screen image to draw into instead.

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