CODEWITHSUNDEEP
iosswiftuitableviewswift4
Den Andreychuk
Den Andreychuk

Reputation: 478

Which method call's after inserting cell into Table View

I'm a little confused with inserting cell into a table view.

When I call tableView.insertRows(at: [indexPath], with: .left) tableView not update immediately after it, inside called function. I think it's call some relevant delegate and data source methods, but which ones?

Also, I have seen that some guys call insertRows with tableView.beginUpdates() and tableView.endUpdates(). Why do we need to do this if the update happens without these two methods?

Upvotes: 0

Views: 52

Answers (2)

MohyG
MohyG

Reputation: 1348

Tableview DataSource methods will be called, to begin a series of method calls that insert, delete, or select rows and sections of the table view, you need to call beginUpdates() followed by endUpdates()

Apple's documentation

Upvotes: 1

Shehata Gamal
Shehata Gamal

Reputation: 100533

numberOfRows && cellForRowAt are called when you do insertion , you need begin & end updates to prevent subsequent calls to numberOfRows in case you have a heavy calls to insertion / deletion to avoid exceptions like number of rows / section before the update isn't equal after adding / removing

now it's recommended to use

https://developer.apple.com/documentation/uikit/uitableview/2887515-performbatchupdates

inside

https://developer.apple.com/documentation/uikit/uitableview/1614908-beginupdates

Upvotes: 2

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