There is no straightforward or built-in method to use APK files on iPhone or iPad devices. iOS devices use IPA format as an app package manager and it is totally different from what Android uses.  But Android apps can be used on Mac desktop devices using emulators such as BlueStacks etc. Here is how you can install and use BlueStacks on Mac Computer. Visit the Official BlueStacks website. Click on the "Download BlueStacks for MacOS" button. It will initiate the download of the .dmg file. Please wait until the download process is complete. Once the file is downloaded, double-click it to start the installation process.  Now you will now be asked to confirm whether you want to use the BlueStacks Installer. Click on "Open" to proceed. Then, just follow the installation instructions as they appear on the screen. Log in with your user account and give security consent when asked.  Once installation is complete, simply launch BlueStacks and begin playing your favorite games on macOS.