iPad: Iterate over every cell in a UITableView?

Question

iPad: Iterate over every cell in a UITableView?

Answer 1

Assuming a variable myTableView exists and its delegate and data source are both set:

UITableViewCell *cell;
NSIndexPath indexPath = [[NSIndexPath indexPathForRow:0 inSection:0];
for(indexPath.section = 0; indexPath.section < [myTableView numberOfSections]; ++indexPath.section)
{
    for(indexPath.row = 0; indexPath.row < [myTableView numberOfRowsInSection:indexPath.section]; ++indexPath.row)
    {
        cell = [myTableView cellForRowAtIndexPath:indexPath];
        // do something with this cell
    }
}

Answer 2

To iterate over every visible cell in a UITableView:

for (UITableViewCell *cell in self.tableView.visibleCells) {
    NSIndexPath *cellIndexPath = [self.tableView indexPathForCell:cell];

(edited to better state answer and hope that this is indexed more accurately for search results with the intention of saving others more time in the future)

Answer 3

Even simpler and more elegant:

-(void) tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell
                                         forRowAtIndexPath:(NSIndexPath *)indexPath {
    // use the "cell" here
}

But obviously it doesn't fit all situations.

Answer 4

for (int section = 0; section < [tableView numberOfSections]; section++) {
    for (int row = 0; row < [tableView numberOfRowsInSection:section]; row++) {
        NSIndexPath* cellPath = [NSIndexPath indexPathForRow:row inSection:section];
        UITableViewCell* cell = [tableView cellForRowAtIndexPath:cellPath];
        //do stuff with 'cell'
    }
}

Answer 5

Swift 4:

for section in 0...self.tableView.numberOfSections - 1 {
            for row in 0...self.tableView.numberOfRows(inSection: section) - 1 {
                let cell = self.tableView.cellForRow(at: NSIndexPath(row: row, section: section) as IndexPath)

                print("Section: \(section)  Row: \(row)")

            }
        }

by steve Iterate over all the UITableCells given a section id

Answer 6

(This builds on aroths answer.)

I like to define this as a category to UITableView so it's available everywhere.

(As mentioned a few times, you should be sure you really want to iterate over the cells themselves. For example: I use this to clear the UITableViewAccessoryCheckmark's from all the cells before setting it to the user selected cell. A good rule of thumb is to do this only if the datasource methods can't do what you need to.)

Define like this:

- (void)enumerateCellsUsingBlock:(void (^)(UITableViewCell *cell))cellBlock {
    NSParameterAssert(cellBlock != nil);
    for (int section = 0; section < [self numberOfSections]; section++) {
        for (int row = 0; row < [self numberOfRowsInSection:section]; row++) {
            NSIndexPath *cellPath = [NSIndexPath indexPathForRow:row inSection:section];
            UITableViewCell *cell = [self cellForRowAtIndexPath:cellPath];
            if (cellBlock != nil) {
                cellBlock(cell);
            }
        }
    }
}

Call like this:

[self.tableView enumerateCellsUsingBlock:^(UITableViewCell *cell) {
    NSLog(@"cell:%@", cell);
}];

It would be good style to typedef the block, too.