Show entire table view inside cell - ios

Question

I need to display a dynamic table view inside a cell (of a static table). Using sections instead will not be enough for me. But I don't want this table to be scrollable, so the entire table must appear at once. The problem is that this table size [and rows count, and each row size] varies according to the content being shown. How can I associate the cell (which holds the table) autoresizing property with a table inside that must show all content at once?
Currently I have the tableView inside the cell, and constraints bonds it to all the 4 sides. The first table (not the one inside the cell) rowHeight property is set to UITableViewAutomaticDimension, but the table inside the cell doesn't appear entirely.
If I set the static cell height to a value greater than the tableView(inside cell) height, the whole table appears, and also an extra space beneath it (as the table is bounded to 4 sides of the cell)
So, any ideas on how to show this entire table inside a cell that dynamically has the perfect size for it ?
ps: I tried using collection view inside the cell. Unfortunately it doesn't serve my purpose.
Thanks!
Update
I tried to create a class for the inner table and use (as pointed by iamirzhan) contentSize didSet, like so:
override var contentSize:CGSize {
didSet {
self.invalidateIntrinsicContentSize()
}
}
I then used this method to call a function that resizes the cell that holds the table: self.frame.size.height = table.contentSize.height. The function is on this cell's own class.
This worked, the table now appears entirely. The problem is that it overlaps the cell underneath it, so i'm still looking for a solution.

Answer 1

I don't see why this requires 2 tableviews. The static portion should be uitableviewheaderfooters or just a UIStackView. But to answer your question simply query your child tableView for its size and return this in tableView:heightForRowAtIndexPath: for the outer tableview. The height of the child tableView is simply the sum of the hieght of all of its children (including any headers/footers). This is usually not difficult to calculate unless you are using something like a webview where you need to actually load the content and get the size asynchronously. You can calculate the size of elements that are based on their intrinsic content size with UIView.sizeThatFits(_:). The other elements should have fixed sizes or constants in the storyboard that you can sum up.

Answer 2

For inner tableView you should write such implementation.
Firstly, disable the scrollEnable flag
Then you should override the intrinsicContentSize method of tableView
Your inner tableView custom class:
class IntrinsicTableView: UITableView {
override var contentSize:CGSize {
didSet {
self.invalidateIntrinsicContentSize()
}
}
override var intrinsicContentSize: CGSize {
self.layoutIfNeeded()
return self.contentSize
}
}
Now, delete the height constraint, and the height will be calculating by its content.