Instance Method インスタンスメソッド

viewWillAppear(_:)

Notifies the view controller that its view is about to be added to a view hierarchy. それのビューがもうすぐあるビュー階層に加えられることをビューコントローラに通知します。

Declaration 宣言 

override dynamic func viewWillAppear(_ animated: Bool)

Parameters パラメータ

animated

If true, the view is being added using an animation.

Discussion 議論

SwiftUI calls this method before adding the hosting controller’s root view to the view hierarchy. You can override this method to perform custom tasks associated with the appearance of the view. If you override this method, you must call super at some point in your implementation.

See Also 参照

Responding to View-Related Events ビュー関連イベントに応答する

func loadView()
func viewDidAppear(Bool)
Notifies the view controller that its view has been added to a view hierarchy.
func viewWillDisappear(Bool)
Notifies the view controller that its view will be removed from a view hierarchy.
func viewDidDisappear(Bool)
func willMove(toParent: UIViewController?)
func didMove(toParent: UIViewController?)
func viewWillTransition(to: CGSize, with: UIViewControllerTransitionCoordinator)
func viewWillLayoutSubviews()
func target(forAction: Selector, withSender: Any?) -> Any?