Please check the below link for your reference. I was used the same one (https://www.loginworks.com/blogs/how-to-make-an-expandable-and-collapsible-table-view-in-ios-using-objective-c/)

I want a solution bcoz of that I posted the Question. Crash Reports - *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Attempted to perform update with invalid index path: <NSIndexPath: 0x600003ee2ee0> {length = 2, path = 0 - 18446744073709551615}' There is nothing like an invalid index but they gave me an error. Thanks for your support. Have a good day too.