This post will show you how to enable the setting for capslock on an iphone or an ipad
and it will show you how to turn capslock on and off once the setting is enabled.

the setting for capslock is disabled by default, so you have to turn it on first:

go to settings > general > keyboard

slide the option for ‘enable caps lock’ to ‘on’

once the option is enabled you can now simply

double tap the shift key

it will turn blue and you will now have caps lock on!
everything you type will be in caps!

to turn off caps lock all you need to do is to tap the shift key when its blue!