The easiest way is using the Airprint feature, where you can directly connect your printer to iPhone wirelessly. Let’s take a look at the steps on how to connect printer to iPhone. First, you need to open the image or document you need to print. Find the print option in app’s share icon. In the pop up, scroll down to the printer icon. Tap on print and then select the printer.  Thereafter, select print option and you cam now print anything directly from your iPhone. 

https://connectmyprinter.com/how-to-connect-or-set-up-a-canon-printer-to-wifi/