viewWillTransitionToSize, animateAlongsideTransition... 넘나 어려운 것

<잊지 말자 문컥>

viewWillTransitionToSize, invalidateLayout, UIViewControllerTransitionCoordinator...

	override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
	super.viewWillTransitionToSize(size, withTransitionCoordinator: coordinator)
	// 컬렉션뷰 재구성
	self.collectionView.collectionViewLayout.invalidateLayout()
	}

view raw transition1.swift hosted with ❤ by GitHub

이 코드의 문제점. 패드에서 디바이스 rotate할 때 비정상 작동.

	override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
	super.viewWillTransitionToSize(size, withTransitionCoordinator: coordinator)
	coordinator.animateAlongsideTransition(nil, completion: { [weak self] _ in
	// 컬렉션뷰 재구성
	self?.collectionView.collectionViewLayout.invalidateLayout()
	})
	}

view raw transition2.swift hosted with ❤ by GitHub