Question

As a user scrolls up and down in an uitableview cells get destroyed and created.

Is there a way to detect when a cell is going to be or has been destroyed?

Answer 1

Assuming that by “getting destroyed” you actually are referring to a cell getting reused, simply implement prepareForReuse within your UITableViewCell derived class.

prepareForReuse

Prepares a reusable cell for reuse by the table view’s delegate.

- (void)prepareForReuse

Discussion

If a UITableViewCell object is reusable—that is, it has a reuse
identifier—this method is invoked just before the object is returned
from the UITableView method dequeueReusableCellWithIdentifier:. For
performance reasons, you should only reset attributes of the cell that
are not related to content, for example, alpha, editing, and selection
state. The table view’s delegate in tableView:cellForRowAtIndexPath:
should always reset all content when reusing a cell. If the cell
object does not have an associated reuse identifier, this method is
not called. If you override this method, you must be sure to invoke
the superclass implementation.

Availability
Available in iOS 2.0 and later.
See Also
– initWithFrame:reuseIdentifier:
@property reuseIdentifier
Declared In
UITableViewCell.h