Returns a Boolean value that indicates whether a file or directory exists at a specified path.
The path of the file or directory. If path begins with a tilde (~), it must first be expanded with stringByExpandingTildeInPath; otherwise, this method returns NO.
App Sandbox does not restrict which path values may be passed to this parameter.
YES if a file at the specified path exists, or NO if the file does not exist or its existence could not be determined.
If the file at path is inaccessible to your app, perhaps because one or more parent directories are inaccessible, this method returns NO. If the final element in path specifies a symbolic link, this method traverses the link and returns YES or NO based on the existence of the file at the link destination.