New APP version must require users to upgrade is to use the old version will not be able to normal use, if I can be detected in application by "http://itunes.apple.com/cn/lookup?id=%@" in the latest version, then popup UIAlertController, Keep only one "Update Now" button. Will this operation be approved by Apple's review? If customers are not forced to update, the documents they made on the old version of the APP will be incorrect