iphone - Unable to change font size on UILabel in iOS -

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i have started learning ios programming. working on demo application in using font "ge flow regular"(ge_flow_regular.otf) & "ge flow bold" arabic language. have followed required steps add custom fonts in ios app.
want increase or decrease size of texts on uilabel in ios unable specified font. can perform font size increase or decrease other fonts in ios. don't understand why unable change font size "ge flow regular" font?

please me solve problem.

have tried using [uifont fontwithname:size:]?


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