IOS 为整个APP设置一个字体，但是不指定字体大小

- (void)viewDidLoad

{

    [super viewDidLoad];

    [self setFontFamily:@"FagoOfficeSans-Regular" forView:self.view andSubViews:YES];

}

-(void)setFontFamily:(NSString*)fontFamily forView:(UIView*)view andSubViews:(BOOL)isSubViews

{

    if ([view isKindOfClass:[UILabel class]])

    {

        UILabel *lbl = (UILabel *)view;

        [lbl setFont:[UIFont fontWithName:fontFamily size:[[lbl font] pointSize]]];

    }

    if (isSubViews)

    {

        for (UIView *sview in view.subviews)

        {

            [self setFontFamily:fontFamily forView:sview andSubViews:YES];

        }

    }    

}