UITableView add cell Animation

Question

Can any one help me out with UITableView animating issue?

By default we have animation for deleting cell and reordering cells in UITableView.

Can we have animated adding cell, if so how to do it.

I have checked out Three20, did not not get how twitter has done the table expand animation under MyProfile>ReTweets.

Want to try it without Three20 frameowrk, using the existing animation in UITableView.

Answer 1

You can use the following UITableView method:

- (void)insertRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation 

Example with self.dataSource being a mutable array and your table only having 1 section:

[self.dataSource addObject:@"New Item"]; NSIndexPath *newIndexPath = [NSIndexPath indexPathForRow:[self.dataSource count]-1 inSection:0]; [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade]; 

Note: Subtracted 1 from datasource count since NSIndexPath is zero indexed.

Answer 2

Swift

Example array that is the data source for the table view

var myArray = ["Cow", "Camel", "Sheep", "Goat"] 

The following will add a row with animation at the top of the table view.

// add item to current array myArray.insert("Horse", atIndex: 0)  // insert row in table let indexPath = NSIndexPath(forRow: 0, inSection: 0) tableView.insertRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Fade) 

Multiple updates

If you need to do multiple insertions and/or deletions then surround them with beginUpdates() and endUpdates().

tableView.beginUpdates() tableView.insertRowsAtIndexPaths([addIndexPath1, addIndexPath2, ...], withRowAnimation: .Fade) tableView.deleteRowsAtIndexPaths([deleteIndexPath1, deleteIndexPath2, ...], withRowAnimation: .Fade) tableView.endUpdates() 

Further reading

• Documentation