The Panasonic app has a great user interface and so is easy to navigate, as is the camera functionality. Controls are not buried deep inside the menu so its simple to make your way around.
PANASONIC IMAGE APP — Download from the Apple Store or Google Play for Android
The camera has an electronic zoom therefore it is able to be controlled through the app. This is really amazing as the zoom is 25-400mm and is a Leica lens. The camera comes out of the Panasonic factory but is identical to the Leica.
Panasonic DMC-FZ1000 with Leica 25-400mm zoom lens f2.8-f4. The camera is about $1000
Check out this review www.dpreview.com/reviews/panasonic-lumix-dmc-fz1000
This is the camera I recommend, because it can be totally controlled from an app on the iPhone or Android. The app is great to use and can also control the zoom — none of the other cameras enable you to control as much as this one. Panasonic DMC-FZ1000 with Leica 25-400mm zoom lens f2.8-f4. This camera is not touch screen, but through the free Panasonic image app for mobile devices you can control everything including zoom.