fonts - objective c finding pixel width of a string -

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alt text

i have uibutton of fixed width , want place text in it. since size of string unknown in advance, have resize font read string flat file. how can that? function similar following great:

uifont resizefontas:(uifont)initialfont andstringas:(nsstring*)string andwidthas:(int)width

thanks in advance

edit : code doesnt seem work:

// method creating button, background image , other properties - (uibutton *) getcallagentbuttonwithtitleas:(nsstring *)atitle andimageas:(uiimage*)bgimg atindex:(int)index{         uibutton *abutton = [uibutton buttonwithtype:uibuttontyperoundedrect];       abutton.frame = cgrectmake(10, 2+index*50, 300, 48);         abutton.titlelabel.frame = cgrectmake(abutton.titlelabel.frame.origin.x + 25.0,                   abutton.titlelabel.frame.origin.y, abutton.titlelabel.frame.size.width - 50.0,     abutton.titlelabel.frame.size.height);          abutton.titlelabel.adjustsfontsizetofitwidth = yes;     [abutton settitle:atitle forstate:uicontrolstatenormal];     //abutton.titlelabel.font = [uifont boldsystemfontofsize:12];        [abutton settitlecolor:uicolorfromrgb(0xfdd428) forstate:uicontrolstatenormal];     [abutton setbackgroundimage:bgimg forstate:uicontrolstatenormal];     [abutton addtarget:self action:@selector(callagent:) forcontrolevents:uicontroleventtouchupinside];     // set tag index , use later obtain phoneno     [abutton settag:index];     return abutton;   }

you can tell button's label resize font itself.

mybutton.titlelabel.adjustsfontsizetofitwidth = yes; mybutton.titlelabel.minimumfontsize = 6.0; // pick own value here.

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