The only thing you have to care for is that your syntax is correct and some other things you probably will never come across (e.g. you cant overwrite a final method). If you show us the code of your method we can help you to correct it.

Press Control-Shift-I for auto-layout (indents everything properly); then look to see if you have exactly one line with a close squiggly bracket as the first character at the end of the class code. If not, then you need to fix your bracketing. If problem still persists, then go through the code in the class and make sure each method starts at the first indent. I am presuming that you are getting a message that says something to the effect of 'class, type, or enum expected'.