How to determine if the user closed the app window?

I have a script that calls an App Designer mlapp as an interface for a user to enter information. How can I get my main script to determine if the user has closed the window (using the X in the title bar)?

Answer 1

[Kevin Holly]

When you run the app in your main script, you could assign a variable to its handle.

app = YourApp;

You can check if it is deleted with:

isvalid(app)

Another useful function is you could use is uiwait.

You could also add a Close Request Function to your app.