Disable flashing scroll bar of a UITableViewController? - ios

Question

I have a UITableViewController, and I'd like to make it not flash the vertical scroll bar when I go back from a push action segue on one of it's cells (popping the view controller and going back to the UITableViewController).
It seems that, if the table has many rows (mine has around 20 with 60 points height each, so bigger than the screen), when I go back, it always flashes the vertical scroll bar once to show where it is in the table. However, I don't want that to happen, but I do want to keep the scrollbar around so it shows when the user scrolls. Therefore, disabling it completely is not an option.
Is this default behavior and can I disable it temporarily?

Answer 1

There is a simpler solution that doesn't require avoiding using a UITableViewController subclass.
You can override viewDidAppear: as stated by http://stackoverflow.com/users/2445863/yonosoytu, but there is no need to refrain from calling [super viewDidAppear:animated]. Simply disable the vertical scrolling indicator before doing so, and then enable it back afterwards.
- (void)viewDidAppear:(BOOL)animated {
self.tableView.showsVerticalScrollIndicator = NO;
[super viewDidAppear:animated];
self.tableView.showsVerticalScrollIndicator = YES;
}
If you're using Interface Builder, you can disable the Shows Vertical Indicator option on the tableView for your UIViewController and enable it in code as shown above.

Answer 2

To get Cezar's answer to work for iOS10 I had to include a (sizeable) delay before re-enabling the scroll indicator. This looks a bit strange if someone tries to scroll before the second is up, so you can re-enable the scroll indicator as soon as someone scrolls.
override func viewDidAppear(_ animated: Bool) {
tableView.showsVerticalScrollIndicator = false
super.viewDidAppear(animated)
DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
self.tableView.showsVerticalScrollIndicator = true
}
}
override func scrollViewDidScroll(_ scrollView: UIScrollView) {
if !tableView.showsVerticalScrollIndicator {
tableView.showsVerticalScrollIndicator = true
}
}
Actually, on thinking about it, you don't even need the delay, just do this:
override func viewDidAppear(_ animated: Bool) {
tableView.showsVerticalScrollIndicator = false
super.viewDidAppear(animated)
}
override func scrollViewDidScroll(_ scrollView: UIScrollView) {
if !tableView.showsVerticalScrollIndicator {
tableView.showsVerticalScrollIndicator = true
}
}

Answer 3

Update: Please, look at Cezar’s answer below, which gives a nice workaround without any of the drawbacks of my proposals.
According to the documentation it is a behaviour of UITableViewController:
When the table view has appeared, the controller flashes the table view’s scroll indicators. The UITableViewController class implements this in the superclass method viewDidAppear:.
So I think you have two options:
You can avoid using UITableViewController and start using a naked UIViewController. Rebuilding the functionality of UITableViewController from UIViewController is not that hard (you can follow this old article as reference).
Override viewDidAppear: and don’t call [super viewDidAppear:animated]. The problem here is that you don’t know what else does UITableViewController do when viewDidAppear: is called, so you might break something.