Saya ingin membuat animasi seperti folder layar beranda iOS, dan saya harus mengetahui bingkai posisi akhir "folder":
Saya menggunakan transisi khusus dan berikut adalah kode file animasinya:
class FolderAnimationController: NSObject, UIViewControllerAnimatedTransitioning {
let duration = 5.0
var presenting = true
func transitionDuration(_ transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return duration
}
func animateTransition(_ transitionContext: UIViewControllerContextTransitioning) {
let containerView = transitionContext.containerView()
let toViewC = transitionContext.viewController(forKey: UITransitionContextToViewControllerKey)! as! ProjectViewController
let fromViewC = transitionContext.viewController(forKey: UITransitionContextFromViewControllerKey)!as! ViewController
let cell : FolderCollectionViewCell = fromViewC.folderCollectionView.cellForItem(at: (fromViewC.folderCollectionView.indexPathsForSelectedItems()?.first!)!) as! FolderCollectionViewCell
let cellSnapshot: UIView = cell.snapshotView(afterScreenUpdates: false)!
let cellFrame = containerView.convert(cell.frame, from: cell.superview)
cellSnapshot.frame = cellFrame
cell.isHidden = true
toViewC.view.frame = transitionContext.finalFrame(for: toViewC)
toViewC.view.alpha = 0
containerView.addSubview(toViewC.view)
containerView.addSubview(cellSnapshot)
UIView.animate(withDuration: duration, animations: {
toViewC.view.alpha = 1.0
let finalFrame = containerView.convert(toViewC.containerView.frame, from: toViewC.view)
cellSnapshot.frame = finalFrame
}) { (_) in
cellSnapshot.removeFromSuperview()
transitionContext.completeTransition(true)
}
}
}
Semua berfungsi dengan benar, kecuali let finalFrame = containerView.convert(toViewC.containerView.frame, from: toViewC.view) yang menetapkan nilai finalFrame (adalah variabel CGRect) ke (origin = (x = 0, y = 0), size = (width = 0, height = 0)).
Saya telah mengikuti tutorial ini, menulis kode saya di Swift
Jadi, bagaimana cara mengakses properti dengan benar?
