Swift tableview changes the value of a random cell when one cell is edited

Question

I have a long list of textfields so I am using a tableView.

this is how the screen looks like

When I insert some text in a textfield in one of the cells and scro

Answer 1

Your main problem is that you are keeping your data inside Views (UITableVieCell).

Cells are reused by UITableView to optimize performance - so even if you have 1milion rows in your table, only few UITableViewCells are in memory (as many as are visible on the screen usually).

When you are calling dequeueReusableCell it takes one of already existing cells and reuse it.

To solve this problem you need to keep your data separately in an Array and keep modified texts there. Then you need to modify code you posted, to take data every single time you configure UITableView from your "dataSource".

Also a good pratcice is to reset UITableViewCell when it's reused, you can do this by adding coding inside prepareForReuse - but that's optional, as text will be set from your data source anyways.

I would also recommend to read this before you start coding further - it will allow to understand how UITableView works on iOS:

https://developer.apple.com/library/content/documentation/UserExperience/Conceptual/TableView_iPhone/TableViewCells/TableViewCells.html#//apple_ref/doc/uid/TP40007451-CH7-SW1