IOS notes -- traverse tableview

IOS does not advocate traversing all cells. It can be seen from the APIS thrown to developers. It provides a visiblecells method, so that you do not have to easily obtain all cells and optimize the memory usage.

What should I do if I have to traverse all cells?

// Only visible cells are returned.

- (UITableViewCell *)cellForRowAtIndexPath:(NSIndexPath *)indexPath

// Only the invisible cell is returned.

- (UITableViewCell *)dequeueReusableCellWithIdentifier:(NSString *)identifier
If the two methods are used together, it will be OK.
However, IOS does not want developers to traverse all cells, so our final perfect solution is to split the logic, split the design, and update the data one by one, so it is better for IOS.
The trick mentioned above should be an emergency.