从一个文件复制到另一个文件的代码不会生成。

I have some code that sets a border around a UITextView. It builds correctly in one class; when I take that code and copy it to another class (changing the object name), it no longer builds, saying "Property 'borderWidth' cannot be found in forward class object 'CALayer *'" (the same message for the other two lines of code). I have done a clean, re-build and nothing helps. Why is this happening? and how do I fix it?I have some code that sets a border around a UI