try this code...
UIFont *yourFont = [UIFont fontWithName:@"Helvetica-BoldOblique"
size:[UIFont systemFontSize]];
lblTitle.font = yourFont;
you can use also another fontName for BoldItalik like.
Optima-BoldItalic
,TimesNewRomanPS-BoldItalicMT
,Baskerville-BoldItalic
,HelveticaNeue-BoldItalic
,etc...