Highlight selected tableViewCell to match with UITextfield.text - ios

Question

I have a tableview with values that could be the same.
When selecting the cell, the textfield value will be populated with the selected cell.
I want to only highlight the row that was selected rather than highlight all the values that are the same as the textfield.
My approach currently:
where data is an array of possible values
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:#"identifierCell"];
}
NSString *value = ([self.data objectAtIndex:indexPath.row]);
NSString *selectedValue = textField.text;
if ([value floatValue] == [selectedValue floatValue]) {
cell.backgroundColor = [UIColor colorWithRed:220.0/255.0 green:220.0/255.0 blue:220.0/255.0 alpha:1.0];
cell.textLabel.textColor = [UIColor whiteColor];
}
else {
cell.backgroundColor = [UIColor clearColor];
cell.textLabel.textColor = [UIColor blackColor];
}
Side note: I have a couple of these drop down fields that can change the textfield text depending on which row was selected. (i.e. if row 1 was selected in the other dropdown, then 1.391 would be populated in the textfield text.
Not sure how relevant that will be.
How would I check only the row that was selected and populate the textfield per the image below?
Update: Thanks to #k06a using indexPath is a step forward, however the problem now arises where when if row A is selected, the indexPath for B should not change. I was thinking of setting 2 different indexPath variables and on didSelectRowAt only set those for the methods I'm calling to change the other respective values

Answer 1

You can enumerate all cells within a loop to select and deselect rows based on selectedValue and value equality. This loop will deselect previous row, and select a new one. And not forget to setup initial state after dequeing reusable cell. All cells can be fetched with: self.tableView.visibleCells
Or you can just deselect previous cell by remembering its indexPath. And select a new one and remember its indexPath. This is the most effective variant.
Or you can just call [self.tableView reloadData] when wanna change selection. This will be less effective, but shorter and easier to implement.
UPDATE:
Just use different condition of cell selection not basing on value but basing on indexPath. And remind me why do you need manual selection of cell? I mean manual setting backgroundColor and textColor can be automatic by [UITableViewCell setSelected:] selection.

Answer 2

My solution thanks to #k06a
NSIndexPath *selectedIndexPathA;
NSIndexPath *selectedIndexPathB;
In didSelectRowAtIndexPath I pass in the indexPath to the method that will set these values:
[self setOtherFieldsWithIndexPath:indexPath];
and in setOtherFieldsWithIndexPath method
if (rowA) { selectedIndexPathA = indexPath; }
else if (rowB) { selectedIndexPathB = indexPath; }
else {...}
then finally in cellForRowAtIndexPath
if (selectedIndexPathA.row == indexPath.row) {
cell.backgroundColor = [UIColor colorWithRed:220.0/255.0 green:220.0/255.0 blue:220.0/255.0 alpha:1.0];
cell.textLabel.textColor = [UIColor whiteColor];
}
else if (selectedIndexPathB.row == indexPath.row) {
cell.backgroundColor = [UIColor colorWithRed:220.0/255.0 green:220.0/255.0 blue:220.0/255.0 alpha:1.0];
cell.textLabel.textColor = [UIColor whiteColor];
}
else {
cell.backgroundColor = [UIColor clearColor];
cell.textLabel.textColor = [UIColor blackColor];
}
Not sure if this is the best solution but, it currently works the way I want it to work.