Google has rolled out Google Drive mobile app for the Apple iOS devices.
Google Drive has been available for Android devices since the day of the launch.
Google Drive for iOS would let you access all the data stored in your Drive account.
Google spoke about this app:
Quickly share a photo with a friend 1000 miles away. Read the most up to date version of your document whether you’re at home, at the office, or on the go. Make items available offline so you view them while you’re on a plane. No matter what happens to your devices, even if your iPhone goes for a swim, your files are safely stored in Google Drive.