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PDFKitten emphasizes incorrect position

I use PDFKitten to search for strings in PDF documents with highlighting results. FastPDFKit or any other commercial library is not an option, so I stick to the one closest to my requirements.

Wrong coordinate

As you can see in the screenshot, I was looking for the string "in", which is always correctly highlighted, except for the last one. I have a more complex PDF document in which the highlighted field for "in" is almost 40% wrong.

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appendPDFString StringDetector :

// Use CID string for font-related computations.
NSString *cidString = [font stringWithPDFString:string];

// Use Unicode string to compare with user input.
NSString *unicodeString = [[font stringWithPDFString:string] lowercaseString];

stringWithPDFString Font unicode.

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+4

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