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No, not necessarily, but it can cause a minor issue. iPhones use a Lithium-Ion battery for its power, using while it's charging won't necessarily ruin the battery, but if you're using the phone while the battery is in the charging process, it can cause the phone to think it has more power than it actually has.
1 A good number of new phones have a cutoff feature that stops charging once it reaches 100 percent and has a 3 stage charging method these phones are safer to charge using power banks and even if it reaches 100 percent this feature stops further entry of current and helps to prevent damage to the battery. A good number of new phones have a cutoff feature that stops charging once it reaches 100 percent and has a 3 stage charging method these phones are safer to charge using power banks and even if it reaches 100 percent this feature stops further entry of current and helps to prevent damage to the battery.