scroll.contentSize = CGSizeMake（320,2700）; //您可以根据您的要求使用contentize

scroll.contentSize= CGSizeMake(320,2700);// You can use contentsize according to your requirements

你已经把这里只有scrollview代码。所以，我无法弄清楚出了什么问题。使用以下参考...

You have put here only scrollview code. So,I can't figure out what is wrong. Use following reference...

UIScrollView With UITextField

希望，这对你有帮助..

Hope, this will help you..