UITableView - scroll to the top

UITableView is a subclass of UIScrollView, so you can also use:

[mainTableView scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];

[mainTableView setContentOffset:CGPointZero animated:YES];

And in Swift:

mainTableView.setContentOffset(CGPointZero, animated:true)

And in Swift 3 & above:

mainTableView.setContentOffset(.zero, animated: true)

Note: This answer isn't valid for iOS 11 and later.

I prefer

[mainTableView setContentOffset:CGPointZero animated:YES];

If you have a top inset on your table view, you have to subtract it:

[mainTableView setContentOffset:CGPointMake(0.0f, -mainTableView.contentInset.top) animated:YES];

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