If you are having trouble quitting the Finder on your iOS device, it may be because an operation is still in progress. To fix this, try the following steps:
1. Tap and hold the Finder icon on your Home screen.
2. When the icon jiggles, tap the X in the corner.
3. Tap Delete when prompted.
4. Press and hold the Sleep/Wake button on your device.
5. When the slider appears, drag it to power off your device.
6. Press and hold the Sleep/Wake button again to turn your device back on.
7. Try quitting the Finder again.