Given such an obvious method name I have to ask: Did you even open the documentation and try to do something for yourself before asking? Or do you just expect others to do all the work for you?
How did you come to that path? You should not be hardcoding it. Use NSSearchPathForDirectoriesInDomains to find the path to your apps sandboxed area and append the path of the file. Also check using NSFileManager that the file exists at the path first