Calculation of text size for iOS learning

IOS7 a new BoudingRectWithSize:options:attributes:context method to calculate the text size:

nsstring* desc = @ "thought of string";

nsdictionary *attribute = @{nsfontattributename: [uifont systemfontofsize:13]};//text size
cgsize size = [desc boundingrectwithsize:cgsizemake (0)  

                         options:  nsstringdrawingtruncateslastvisibleline | Nsstringdrawinguseslinefragmentorigin |     

Nsstringdrawingusesfontleading

Attributes:attribute context:nil].size;

Get the size of the width of the high

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Calculation of text size for iOS learning