ios - PDF: Unable to highlight selected word from UIWebView -

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i doing book reading app. displaying every pdf in uiwebview. trying highlight selected word. failed. then, unable selected string pdf too.

my code:

webview.stringbyevaluatingjavascriptfromstring("window.getselection().tostring();")

the above code working fine, when uiwebview content html. but, failed in pdf. kindly guide me, how highlight selected text colour?


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