What If I Delete My Favorite App?
You can redownload any app from the App Store by locating it on the App Store (or in your purchase history) and tapping the download button. Just make sure you’re signed into the App Store with the account that made the purchase.
Some apps will sync with iCloud, but others may need to be set up again; it depends on the app. If you made in-app-purchases, the app might offer an option to restore purchases you made. If you need help, try contacting the developer.