See here you have to first save the scrolled position of tableView i.e. contentOffset of tableView and then reuse it when you are coming back to tableView. 1)When and where you will save it : When : At the point, when you are drilling down to detailViewController save the contentOffset of tableView How : float … Read more
UIKit isn’t thread safe. The UI should only be updated from main thread: dispatch_async(dispatch_get_main_queue()) { self.tableView.reloadData() } Update. In Swift 3 and later use: DispatchQueue.main.async { self.tableView.reloadData() }
From the UITableView documentation beginUpdates Begin a series of method calls that insert, delete, or select rows and sections of the receiver. That means, you should not use this unless you are inserting, deleting or selecting. You are doing neither of these. Also, you should end beginUpdates with endUpdates, not reloadData. Documentation: This group of … Read more
The way Apple implements UITableView is not intuitive to everyone and it’s easy to misunderstand the role of heightForRowAtIndexPath:. The general intention is that this is a faster and light-on-memory method that can be called for every row in the table quite frequently. This contrasts with cellForRowAtIndexPath: which is often slower and more memory intensive, … Read more
I was having trouble with this because I mess with cell sizing in my cellForRowAtIndexPath method. I noticed that the sizing information was off after doing reloadData, so I realized I needed to force it to layout immediately before setting the content offset back. CGPoint offset = tableView.contentOffset; [tableView.messageTable reloadData]; [tableView layoutIfNeeded]; // Force layout … Read more
To add to the correct answer, if you want to reload all sections in your UITableView you will need to do the following: ObjC NSRange range = NSMakeRange(0, [self numberOfSectionsInTableView:self.tableView]); NSIndexSet *sections = [NSIndexSet indexSetWithIndexesInRange:range]; [self.tableView reloadSections:sections withRowAnimation:UITableViewRowAnimationAutomatic]; Swift let range = NSMakeRange(0, self.tableView.numberOfSections) let sections = NSIndexSet(indexesIn: range) self.tableView.reloadSections(sections as IndexSet, with: .automatic) This … Read more
The reload happens during the next layout pass, which normally happens when you return control to the run loop (after, say, your button action or whatever returns). So one way to run something after the table view reloads is simply to force the table view to perform layout immediately: [self.tableView reloadData]; [self.tableView layoutIfNeeded]; NSIndexPath* indexPath … Read more