【iOS】UIViewControllerのライフサイクル (Swift)

いまさら聞けない、

Swift UIViewControllerのライフサイクル 

下記が主なイベント

class ViewController: UIViewController {

    override func viewDidLoad() {

        super.viewDidLoad()

        print("viewDidLoad")

    }    

    override func viewWillAppear(_ animated: Bool) {

        super.viewWillAppear(animated)

        print("viewWillAppear")

    }

    override func viewDidAppear(_ animated: Bool) {

        super.viewDidAppear(animated)

        print("viewDidAppear")

    }

    override func viewWillLayoutSubviews() {

        super.viewWillLayoutSubviews()

        print("viewWillLayoutSubviews")

    }

    override func viewDidLayoutSubviews() {

        super.viewDidLayoutSubviews()

        print("viewDidLayoutSubviews")

    }

    override func viewWillDisappear(_ animated: Bool) {

        super.viewWillDisappear(animated)

        print("viewWillDisappear")

    }

    override func viewDidDisappear(_ animated: Bool) {

        super.viewDidDisappear(animated)

        print("viewDidDisappear")

    }

}

下記のような感じに呼ばれます。

viewDidLoad

viewWillAppear

viewWillLayoutSubviews

viewDidLayoutSubviews

viewDidAppear

--  表示完了   

viewWillDisappear

viewDidDisappear

これくらい、余裕ですよね？

追記　prettyprint を追加したのでみやすいように下記追加しました。

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        print("viewDidLoad")
    }
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        print("viewWillAppear")
    }
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        print("viewDidAppear")
    }
    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()
        print("viewWillLayoutSubviews")
    }
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        print("viewDidLayoutSubviews")
    }
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        print("viewWillDisappear")
    }
    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)
        print("viewDidDisappear")
    }
}

下記のような順番でよばれます。

開始時

viewDidLoad
viewWillAppear
viewWillLayoutSubviews
viewDidLayoutSubviews
viewDidAppear

終了時

viewWillLayoutSubviews
viewDidLayoutSubviews
viewWillDisappear
viewWillLayoutSubviews
viewDidLayoutSubviews
viewDidDisappear

#ライフサイクル

#Lifecycle

#UIViewController

#Swift