Take it away. Don't give it at all. Place other toys near him. After few tantrums he will play with the toys. Say something like iPad go bye bye if he asks. Talk with him, go for walks, go to garden, play music, read books etc.
With all due respect just dont give it to him. Yes it will be rough for a few days but its literally to benefit his health and wellbeing and in a few days he will forget about it
Just take it away, my 13month old chucks himself on the floor for all kinds of reasons (I’ve said no to pulling off the wallpaper, I’m trying to put him in his pram suit, stopping him eating dirt, hidden my Fitbit from him etc…) he’s easily distracted and happy again think they are just learning about their feelings, desires and opinions at this age and learning they can’t always do what they want
Why would you buy a one year old an Ipad? Sorry, not judging. Just genuinely interested