UITableView contentOffSet is not working properly

Question

In viewWillAppear, I have added UISearchBar as my headerview of UITableView. When view loads, I hides UISearchbar under <

Answer 1

In earlier versions of the iOS SDK, methods such as viewWillAppear ran on the main thread, they now run on a background thread which is why the issue now occurs.

Most callbacks tend to fire on a background thread so always check for thread safety when doing UI calls.

Dispatch the change to the content offset on the main thread:

Objective C

dispatch_async(dispatch_get_main_queue(), ^{
    CGPoint offset = CGPointMake(0, self.searchBar.bounds.height)
    [self.tableView setContentOffset:offset animated:NO];
});

Swift 3

DispatchQueue.main.async {
            let offset = CGPoint.init(x: 0, y: self.searchBar.bounds.height)
            self.tableView.setContentOffset(offset, animated: false)
        }