I think you need to add the attributes and then change the text for both textViews. So, use as the following :
NSMutableAttributedString *title = [[NSMutableAttributedString alloc]initWithString:text];
UIFont *font = [UIFont fontWithName:@"Arial" size:15];
[title addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, title.length)];
titleView1.attributedText = title;
UIFont *font = [UIFont fontWithName:@"Arial" size:35];
[title addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, title.length)];
titleView1.attributedText = title;