1. Use the shortcut command: On the iOS device, open the shortcut command application, search for "archive" and "* * * enjoyment", and then perform the operations of "extract from archive" and "* * * enjoyment" in turn, so that the rar compressed package can be decompressed by the shortcut command.

2. Use a third-party application: You can search and install a third-party decompression application, such as Unarchiver, in the AppStore, then open the application and select the rar file to decompress.

3. Open with other applications: select the rar file in the file application, and then select "Open with other applications" to select a decompression application from the list, such as WPSOffice or other third-party decompression software.

4. Use cloud storage service: You can upload rar files to cloud storage services such as iCloud, GoogleDrive or Dropbox, and then log in to the same cloud storage account on another device to download and decompress the files.

5. Use the mail client: If the decompression application is not installed, you can send the rar file by mail, then open it in the mail client and select the decompression application to decompress.