How to know the UITableview row number

Question

I have a UITableViewCell with UISwitch as accessoryview of each cell. When I change the value of the switch in a cell, how can I know in which row the switch is? I need the row number in the switch value changed event.

Answer 1

One more variant of using superView. Works like category for UIView.

- (UITableViewCell *)superCell
{
    if (!self.superview) {
        return nil;
    }

    if ([self.superview isKindOfClass:[UITableViewCell class]]) {
        return (UITableViewCell *)self.superview;
    }

    return [self.superview superCell];
}

Answer 2

i dont know about the multiple sections but i can give you for the one section...

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSInteger index=indexPath.row;
NSString *string=[[NSString alloc]initWithFormat:@"%ld",(long)index];
}

from this you can get the row number and you can save it to the string....

Answer 3

If you set the tag property to the row number (as suggested by other answers), you have to update it every time in tableView:cellForRowAtIndexPath: (because a cell can be reused for different rows).

Instead, when you need the row number, you can walk up the superview chain from the UISwitch (or any other view) to the UITableViewCell, and then to the UITableView, and ask the table view for the index path of the cell:

static NSIndexPath *indexPathForView(UIView *view) {
    while (view && ![view isKindOfClass:[UITableViewCell class]])
        view = view.superview;
    if (!view)
        return nil;
    UITableViewCell *cell = (UITableViewCell *)view;
    while (view && ![view isKindOfClass:[UITableView class]])
        view = view.superview;
    if (!view)
        return nil;
    UITableView *tableView = (UITableView *)view;
    return [tableView indexPathForCell:cell];
}

This doesn't require anything in tableView:cellForRowAtIndexPath:.

Answer 4

Tags, subclasses, or view hierarchy navigation are too much work!. Do this in your action method:

CGPoint hitPoint = [sender convertPoint:CGPointZero toView:self.tableView]; 
NSIndexPath *hitIndex = [self.tableView indexPathForRowAtPoint:hitPoint];

Works with any type of view, multi section tables, whatever you can throw at it - as long as the origin of your sender is within the cell's frame (thanks rob!), which will usually be the case.

And here it is in a UITableView Swift extension:

extension UITableView {
    func indexPath(for view: UIView) -> IndexPath? {
        let location = view.convert(CGPoint.zero, to: self)
        return self.indexPathForRow(at: location)
    }
}