ios - Rounded corners with NSMutableAttributedString -

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my question think simple couldn't find google. using nsmutableattributedstring modify styles in string , example use code change background color:

    [string addattribute:nsbackgroundcolorattributename value:[uicolor colorwithred:0.4 green:0.8 blue:1 alpha:1] range:nsmakerange(0,18)];

and question is, how can round corners of background?
in advance.


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