iPad: Iterate over every cell in a UITableView?

Question

iPad: Iterate over every cell in a UITableView?

Answer 1

(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.