it does not help much then, does it? 
In practical terms, the HC-05 has an SPP profile. iOS does not support SPP.
you need a MFi licence and bluetooth module from a certified vendor if you want to develop a product - which is probably beyond the business of 99.9999% of the people here.
Going BLE is what Apple recommends but it was not supported before the 3rd generation of iPads...