There are a couple of methods to achieve this.
First and Recommended.
Synthesizing, it would be best to read about this in the
documentation.
Second, if you just want a quick and dirty way to do it(the old way), however this could be used with dynamic synthesizing aswell.
In the menu bar in Xcode, you'll see a script menu. Highlight the variables that you would like the getter setter methods for, select script menu -> code -> Place accessor Decls on Clipboard / Place accessor Defs on Clipboard
Then paste into your interface and implementation files appropriately.