There is no way to directly utilize The GDPS Editor 2.2 using the iPhone and iPad. The GDPS Editor can modify and generate unique levels to play Geometry Dash.
However, it’s not available or accessible on iOS devices. The officially licensed Geometry Dash is available for iPhone and iPad but has no editing capabilities.
The editor is available only on the PC version of the game. While a few non-official methods are listed in the search results, for example, using emulators and loading modified IPAs, these methods aren’t recommended or approved by the game’s creators.
They might also violate the conditions of service, which could result in your account being banned. The best method to play and make unique Geometry Dash levels is to utilize only the original PC version.
Mobile versions are great for playing in the field, but the editor isn’t accessible with unsupported methods.