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Set preferredContentSize does not start preferredContentSizeDidChangeForChildContentContainer:

Viewing controller X represents a controller of type Y.

Y.modalPresentationStyle = UIModalPresentationFormSheet [X presentViewController:Y...]

When presenting, Y represents another view controller, Z.

 Z.modalPresentationStyle = UIModalPresentationCurrentContext [Y presentViewController:Z...]

After submission, Z sets its preferredContentSize in a different size. Should not useContentSizeDidChangeForChildContentContainer: call on Y or X? This is not so, and I wonder why.

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Source: https://habr.com/ru/post/1204593/

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