Xlpagertabstrip: Laggy animation on Button Bar selection

[pushkardeshmukh1992]

Whenever tab bar is selected, there's this laggy transition. But when container is swiped horizontally it works smoothly.

Here's my setting

`

    settings.style.buttonBarItemBackgroundColor = .white
    settings.style.buttonBarBackgroundColor = .white
    settings.style.buttonBarItemFont = UIFont(name: AppConstants.fonts.interUIBold, size: 12.0)!
    settings.style.buttonBarItemTitleColor = AppConstants.SminqColors.purpleyGrey
    settings.style.buttonBarItemsShouldFillAvailiableWidth = false

`

• Environment: XLPagerTabStrip: 8.1.0 , Xcode: 10.0 (10A255) and iOS: 12.0.1

[pushkardeshmukh1992]

Any update on this?

[mouness2020]

this problem related to this function buttonBarView.moveTo inside viewDidLayoutSubviews function - class BaseButtonBarPagerTabStripViewController
i just make it works only once at app start then stopped it
here is my code

var firstRun = true

    open override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()

        guard isViewAppearing || isViewRotating else { return }

        // Force the UICollectionViewFlowLayout to get laid out again with the new size if
        // a) The view is appearing.  This ensures that
        //    collectionView:layout:sizeForItemAtIndexPath: is called for a second time
        //    when the view is shown and when the view *frame(s)* are actually set
        //    (we need the view frame's to have been set to work out the size's and on the
        //    first call to collectionView:layout:sizeForItemAtIndexPath: the view frame(s)
        //    aren't set correctly)
        // b) The view is rotating.  This ensures that
        //    collectionView:layout:sizeForItemAtIndexPath: is called again and can use the views
        //    *new* frame so that the buttonBarView cell's actually get resized correctly
        cachedCellWidths = calculateWidths()
        buttonBarView.collectionViewLayout.invalidateLayout()
        // When the view first appears or is rotated we also need to ensure that the barButtonView's
        // selectedBar is resized and its contentOffset/scroll is set correctly (the selected
        // tab/cell may end up either skewed or off screen after a rotation otherwise)
        if firstRun{
        buttonBarView.moveTo(index: currentIndex, animated: false, swipeDirection: .none, pagerScroll: .scrollOnlyIfOutOfScreen)
            firstRun = false
        }
    }

[kevinng]

I have the same problem - is there an update?

[Jacolack]

I had the same problem, and I realized the reason was that I hadn't called super.viewDidAppear(true) In my override func viewDidAppear. The reason the viewDidLayoutSubviews method was called was that isViewAppearing was always true.

I hope this helps someone!

[fcoskun]

Any Update of this?

[vnayakd]

Even I am facing the same problem. This happens on the screen where I have tableview inside XLPagerTabStrip and also when I change the language which supports LTR to RTL and vice versa multiple times . Although swiping works smoothly but tapping on the tabs, animation dies slowly.