Will Fortnite come back to iOS?
Fortnite was taken off the App Store for all Apple devices. This was due to a form-of-payment dispute between Epic and Apple. It is not currently known if/when Fortnite will return to the App Store. For more information on the matter, you can visit Epic's official website post where updates are also shared here.
↗ Can Fortnite be played cross platform?
↗ Can Fortnite be played offline?