How to use an APK file on an iOS device?
1
Download an APK file you want to install in the IPA format.
2
Install Cydia Impactor to sign in to your Apple account to use the IPA file.
3
Connect your iPhone using either a Windows or a macOS.
4
Now launch the Cydia Impactor application.
Go to Settings > General > Software Update. Tap Automatic Updates, then turn on Download iOS Updates. Turn on Install iOS Updates.