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The iOS APIs don’t mention threading restrictions on CoreText APIs. To what extent are they safe to use on non-main threads when calling functions that don’t use a CGContextRef?
Specifically, I’m trying to create a bunch of NSAttributedStrings using a custom truncation algorithm, and I’d like to be able to background the work. I’m only using:
CTLineCreateWithAttributedString
CTLineGetTypographicBounds
CTLineGetStringIndexForPosition
I should have checked
<CoreText/CoreText.h>.