Detect when items are done being inserted into a scrollview

When a user clicks on a button, the app inserts nearly 700 item, each item has 3 text objects and a rect object, so there is about 2800 objects inserted in the scrollview, I have found that even after executing the insert function the objects take some time until they are inserted, the time is nearly nothing with small amount of objects but with 2800 objects, it takes some pretty long time (about 8-10 secs on some phones), I just wanna know when all objects are done being inserted to make a loading screen until they are done.