How can I update a tableview cell from a -(void) method? - ios

Question

I am trying to update a specific dynamic cells font size from a -(void) method or some way without using cellForRowAtIndexPath. Is this possible?
Thanks

Answer 1

If you know the position of the index, as follows:
First create indexPath by row at position:
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:rowIndex inSection:0];
Then access to cell:
MyCell *cell = (MyCell *)[self.tableView cellForRowAtIndexPath:indexPath];

Answer 2

Call
[self.view.tableView reloadRowsAtIndexPaths:#[your_index_path] withRowAnimation:UITableViewRowAnimationAutomatic];
inside your method. that will cause row update

Answer 3

You can not update a cell without having a call to: cellForRowAtIndexPath.
When you want to update font size in a cell, then reload the cell. In your cellForRowAtIndexPath method add a conditional statement to check the indexPath of the cell you want a different font size and edit different font size. Do not forget to add else condition so that when the cell reloads it will make the font size normal for other cells.
However if you want somehow. Then you can use global reference variable to the cell. But this will only work if the cell is displaying on screen.
Here is the example code:
#interface TableViewController ()
{
UITableViewCell *aCell;
}
#end
#implementation TableViewController
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *theCell = [tableView dequeueReusableCellWithIdentifier:#"TableViewCellIdentifier" forIndexPath:indexPath];
if(indexPath.row == SPECIFIC_ROW_NUMBER){
aCell = theCell;
theCell.tag = SPECIFIC_ROW_NUMBER;
}else if (theCell.tag == SPECIFIC_ROW_NUMBER){
// If the cell is dequeued
aCell = nil;
theCell.tag = 99999; // some unused row number
}
}
- (void)someMethod {
if(theCell != nil){
aCell.titleLabel.font = NEW_FONT;
}
}
#end