Question

I have a UITableViewController that has a tableView. Each cell has a button that can be selected/deslected like a checkbox, and the method that does this is working fine. I would like to have another method that gets called by a button in the tableheaderview that is able to iterate through this list and select all of the buttons in one fell swoop. The irony is that I am able to perform the iteration, but can’t seem to call the method that selects/deselects the button.

Here is my relevant code:

//This is my method does the iteration
- (void) startWizard {

    NSLog(@"Did it select?");

    for (int i = 0; i < [self.tableView numberOfSections]; i++) {
        for (int j = 0; j < [self.tableView numberOfRowsInSection:i]; j++) {
            NSUInteger ints[2] = {i,j};
            NSIndexPath *indexPath = [NSIndexPath indexPathWithIndexes:ints length:2];
            UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];
            //Here is my code to call the method that selects/deselects
            [self buttonTouched:nil];



        }
    }
}

and here is the method that does the actual select/deselect of each individual button (and works fine):

-(void)buttonTouched:(id)sender
{
    UIButton *btn = (UIButton *)sender;

    if( [[btn imageForState:UIControlStateNormal] isEqual:[UIImage imageNamed:@"CheckBox1.png"]])
    {
        [btn setImage:[UIImage imageNamed:@"CheckBox2.png"] forState:UIControlStateNormal];
        // other statements
    }
    else
    {
        [btn setImage:[UIImage imageNamed:@"CheckBox1.png"] forState:UIControlStateNormal];
        // other statements
    }

}

The button in each cell has been added to that cell as its accesseryView as follows:

[cell setAccessoryView:testButton];

Can anyone see what I am doing wrong, and how I can fix this?

Answer 1

When you call in the loop [self buttonTouched:nil]; you call the method buttonTouched with nil as value for sender. Therefore, the first line in buttonTouched sets btn to nil and the rest of the methods operates on the nil button.
Either find a way to pass the actual button object to buttonTouched or pass the indexPath an d find the correct button by that.