iPad: Iterate over every cell in a UITableView? - ipad

Question

iPad: Iterate over every cell in a UITableView?

Answer 1

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 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

(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.

Answer 4

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 5

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 6

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 7

This how Im iterating over all table view cells even not visible ones , check my answer here :
https://stackoverflow.com/a/32626614/2715840
Hint : code in Swift.