StuartM StuartM - 1 year ago 58
iOS Question

Accessing cell attributes outside of cellForRowAtIndexPath

I have five fields setup on a Signup controller. Username, displayname, password, confirm password and email address.

They are setup with the following:

static NSString *CellIdentifier = @"Cell";

UITableViewCell *cell = (UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];

cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.textLabel.textColor = [UIColor colorWithRed:14.0f/255.0f green:62.0f/255.0f blue:178.0f/255.0f alpha:0.8f];
cell.textLabel.font = [UIFont boldSystemFontOfSize:13.0f];

switch ( indexPath.row ) {
case 0: {
cell.textLabel.text = NSLocalizedString(@"UsernameFieldLabel", @"Username field label");
[cell addSubview:self.usernameField];
break ;
case 1: {
cell.textLabel.text = NSLocalizedString(@"DisplayNameFieldLabel", @"Displayname field lael");
[cell addSubview:self.displayNameField];
break ;
case 2: {
cell.textLabel.text = NSLocalizedString(@"PasswordFieldLabel", @"Password field lael");
[cell addSubview:self.passwordField];
break ;
case 3: {
cell.textLabel.text = NSLocalizedString(@"ConfirmPasswordFieldLabel", @"Confirm Password field lael");
cell.textLabel.lineBreakMode = UILineBreakModeWordWrap;
cell.textLabel.numberOfLines = 2;
[cell addSubview:self.confirmPasswordField];
break ;
case 4: {
cell.textLabel.text = NSLocalizedString(@"EmailFieldLabel", @"Email field lael");
[cell addSubview:self.emailField];
break ;

return cell;

The cells themselves work fine. I then have some validation on a button which checks for a valid email address etc, this also works fine.

What I would like to be able to do is update the cell.textLabel.textColor attribute in the validation code. For example, if the email address is not valid I want to update the label text color to Red so that it stands out (I also sort the responder etc).

How do I get a reference to this specific cell outside of the setup of cells?

This is the change following an answer. I need to access the 5th cll (index path 4) in section 1(only one section in table view):

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:4 inSection:1];

UITableViewCell* cell = [self.tableView cellForRowAtIndexPath:indexPath];
cell.textLabel.textColor = [UIColor redColor];
[self.tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];

Answer Source

you can get UITableViewCell using NSIndexPath.

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:YOUR_ROW inSection:YOUR_SECTION];

UITableViewCell* cell = [yourTable cellForRowAtIndexPath:indexPath];
cell.textLabel.textColor = YOUR_COLOR;
[yourTable reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];

Hope it helps you.