willTransitionToTraitCollection is not forwarded to TabsViewController

[mooseDev]

Currently

    override func willTransitionToTraitCollection(newCollection: UITraitCollection, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {

        super.willTransitionToTraitCollection(newCollection, withTransitionCoordinator: coordinator)
    }

gets never called in a viewController of a tab bar item.

Same applies to

override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
        super.viewWillTransitionToSize(size, withTransitionCoordinator: coordinator)
    }

[serejahh]

Hi @mooseDev! Because in only portrait orientation a trait collection is still the same. If you enable landscape orientation these methods get called. It also can happen if you locked changing orientation on your device

[mooseDev]

Hmm...

Let me explain it again:

Example Project:

• Add 'Landscape Left/Right' to targets device orientation
• ExampleViewContoller.swift : Add ' willTransitionToTraitCollection' and 'viewWillTransitionToSize' like mentioned above
• StubContentViewController.swift: Add ' willTransitionToTraitCollection' and 'viewWillTransitionToSize' like mentioned above

Action:

• Run and change orientation and set breakpoint to the added functions

Result:

• Only in ExampleViewController.swift we hit the breakpoints & not in the child view controllers (StubContentViewController.swift)

[serejahh]

I got your point. I'll investigate the issue later. Thanks for reporting!

[mooseDev]

thanks :)