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The log then showed the correct URL.
NSString *s = @"/Users/User/Library/Application Support/iPhone Simulator/6.0/Applications/71578E31-E28G-4C73-437D-E6BDB7CB7Y64/myAppName.app/userSavedDuties.plist";
s = [s stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *u = [NSURL URLWithString:s];
NSLog(@"URL: %@", u);
Your moveToNextTextField would need (UITextField*)sender as its parameter so you can reference the sending textField to get its tag value.
[myTextField addTarget:self action:@selector(moveToNextTextField:) forControlEvents:UIControlEventEditingChanged];