In your example, the Page is declared as an instance. When you close the
application, the elements will be destroyed silently, without having
their attached Component.onDestruction called.

When you use a Page declared in the way you reported in a PageStack or
AdaptivePageLayout, the Page will not be destroyed by these components
as it has not been created by the PageStack/AdaptivePagelayout. So you
won't get the onDestruction triggered either. In order to have that
coming, you need to declare your page as component and add that to the
PageStack/AdaptivePageLayout, or in a separate QML document and use
that.


** Changed in: ubuntu-ui-toolkit (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1477363

Title:
  onDestruction is never called in the QML component

Status in ubuntu-ui-toolkit package in Ubuntu:
  Invalid

Bug description:
  I have created a very simple application, and I want to capture the
  onDestruction event. However, it is never called on a phone, but it is
  called on the desktop. On the page,
  http://developer.ubuntu.com/api/apps/qml/sdk-15.04/Qt.labs.settings.Settings/,
  it is used to save the state of the application.

    Page {
          title: i18n.tr("ondestruction")

          Column {
              spacing: units.gu(1)
              anchors {
                  margins: units.gu(2)
                  fill: parent
              }

              Label {
                  id: label
                  objectName: "label"

                  text: i18n.tr("Hello..")
              }

              Button {
                  objectName: "button"
                  width: parent.width

                  text: i18n.tr("Tap me!")

                  onClicked: {
                      label.text = i18n.tr("..world!")
                  }
              }
          }

          Component.onDestruction: {
              console.log("ondestruction")
          }
      }

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