IPAD recognizes my printer but will not print. It worked fine until a few days ago.

You can also try this:

Settings > Wi-Fi > tap the "i" next to your network > Forget This Network

then reconnect to it.

If that does not work I suggest you check to see if there is a firmware update for your printer. The manual should explain how to check for and update the firmware.

Try turning off wifi on your ipad and turning it back on.

Try turning on Airplane mode, wait a few seconds then turn it back off.

If that does not work, try a Reset: Hold the Sleep/Wake and Home buttons and don’t let go until the screen goes dark and the Apple logo appears (no data will be lost)

You're welcome