字体 segment

NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:[UIFont systemFontOfSize:18],UITextAttributeFont ,[UIColor whiteColor],UITextAttributeTextShadowColor ,nil];
    [segment setTitleTextAttributes:dic forState:UIControlStateSelected];
    [segment setTitleTextAttributes:dic forState:UIControlStateNormal];