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I am making an app in ios that renders a pdf at certain zoom levels. The method looks good but while it is rendering i’d like just to keep the screen paused instead of seeing the rasterized tiles. Is there a way to pause the screen on beginning the process and then show the finished product when done. Something like…
[mainScreen pauseScreen]; //method I'm trying to find
[self redrawPDF]; //this method works fine
[mainScreen resume]; //show finished product
I do not know if it is possible to pause rendering a context to the screen, but you can render to an off-screen bitmap, and then quickly render that bitmap to the screen. This will hide the process of rendering from the end users.
Here is a link to the Stack Overflow answer explaining the process of rendering to an offscreen bitmap.