How to update, not reload, UITableView? - ios

Question

My question may be looks simple, but it doesn't work. I searched a lot and try a lot of methods, but it doesn't want work!
So, I have an UITableView. In the background one of my functions work and detect, if a new message has been received, it writes this value into Core Data and I want to add badges on my cells when I receive a new message.
But when I try this:
func reloadTableView() {
dispatch_async(dispatch_get_main_queue(),{
self.tableView.reloadData()
})
}
it doesn't update my tableView and doesn't show new badges. For this, I need:
Change my controller and return to it
Or I need drag my tableView to top and leave it
in these cases it will show my badges.
So, how can I update my tableView to show new added badges without described above 2 methods?
UPDATE
UPDATE 2
I have 2 files: ContactsTableViewController and Messages.swift.
In my Messages.swift I handle new messages and when I receive a new message I get in logs:
print("New message for \(user.jidStr)")
ContactsTableViewController().reloadTableView()
In my ContactsTableViewController:
func reloadTableView() {
self.tableView.reloadData()
print("updated")
}
It reloads my tableView, as I get updated message in logs, but it doesn't updated it and my badges

Answer 1

Try to update only cells that receive new message with:
self.tableView.beginUpdates()
self.tableView.reloadRowsAtIndexPaths([NSIndexPath(forRow: row, inSection: section)], withRowAnimation: UITableViewRowAnimation.Fade)
self.tableView.endUpdates()
where row - the row of your cell in it section that receive the message

Answer 2

Example in Objective-C:
[_tableView reloadSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationFade];
Example in Swift 2.0:
self.tableView.reloadRowsAtIndexPaths([NSIndexSet, indexSetWithIndex:0], withRowAnimation: UITableViewRowAnimation.Automatic)

Answer 3

Did you try the NSOperationQeue?
func reloadTableView() {
NSOperationQueue.mainQueue().addOperationWithBlock {
self.tableView.reloadData()
})
}
Edit (because I can't comment)
override func viewDidLoad() { NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: "reloadTableView", userInfo: nil, repeats: true) }
If you are using something like this you call the update function every second and this doesn't make sense. You should call it after getting your data

Answer 4

The reloadData should work... ( I think it is better to call it on the main thread. )
Have you checked that your objects array is correct ? If it comes from a CoreData request, it may use the cache. Be sure that you have synchronized the CoreDataContext ( by calling the save method on the context after your insertion ) and that your fetch returns the last created objects.
Just a guess…