iOS scrolling tableView reusable cells reload - ios

Question

I am working with tableviews in iOS. Reusable cells are reloaded when scrolling.
So, when updating -for example- textfields inside a cell, it disappears once scrolling over. I solved it by using an Array that saves all texts in all cells, but I wonder if there's a better way to solve this issue.
Thanks.

Answer 1

Using String array you have to store data of all textfields in tableview.
Use delegate methods of UITableView to implement more efficiently.
-(void)tableView:(UITableView *)tableView didEndDisplayingCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
MyCell * mc = (MyCell *) cell;
names[indexPath.row] = mc.myTf.text;
}
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
MyCell * mc = (MyCell *) cell;
mc.myTf.text = names[indexPath.row];
}
Here, MyCell is the custom cell which has UITextField. name[] is the NSString array declared at class scope like NSString * names[20].

Answer 2

What you are describing is how tableviews are meant to work! The tableView is a display, not a store, and the reusable cells are only those currently displayed
You are right to use an array (or collection) to hold the data and just use the tableView to display it

Answer 3

for memory management (to releasing memory) tableview remove cell memory which are not displaying in current screen its only keep those cell in memory which are currently displaying on screen so you have to store that text separate from tableview.

Answer 4

You issue can be because of multithreading. If you are reloading data from a GCD operation or any NSOperation(different thread), then you have to use the below code to get the handle to main thread
dispatch_sync(dispatch_get_main_queue(), ^{
//perform the reload activity
});

Answer 5

Yes you are doing right, as cells are reused you need to save your data, something like this -
1 . Have an array to hold your data.
2 . Update your array whenever you make any change in your textFields, so that your UI and data are in sync.
Use this array to populate your tableView.

Answer 6

You need to define the cellIdentifier as unique. Then each cell created with unique identifier.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *CellIdentifier = [NSString stringWithFormat:#"Cell%dR%d",indexPath.section,indexPath.row];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
//your logic here
}
return cell;
}