harmony 鸿蒙Lifecycle
Lifecycle
Application Lifecycle
You can define the following application lifecycle functions in the app.js file.
| Attribute | Type | Description | Called When |
|---|---|---|---|
| onCreate | () => void | Listens for application creation. | The application is created. |
| onShow6+ | () => void | Listens for whether the application is running in the foreground. | The application is running in the foreground. |
| onHide6+ | () => void | Listens for whether the application is running in the background. | The application is running in the background. |
| onDestroy | () => void | Listens for application uninstallation. | The application exits. |
Page Lifecycle
You can define the following page lifecycle functions in the .js file of the page.
| Attribute | Type | Description | Called When |
|---|---|---|---|
| onInit | () => void | Listens for page initialization. | Page initialization is complete. This function is called only once in the page lifecycle. |
| onReady | () => void | Listens for page creation. | A page is created. This function is called only once in the page lifecycle. |
| onShow | () => void | Listens for page display. | The page is displayed. |
| onHide | () => void | Listens for page disappearance. | The page disappears. |
| onDestroy | () => void | Listens for page destruction. | The page is destroyed. |
| onBackPress | () => boolean | Listens for the back button action. | The back button is touched. - true means that the page processes the return logic. - false means that the default return logic is used. - If no value is returned, the default return logic is used. |
| onActive()5+ | () => void | Listens for page activation. | The page is activated. |
| onInactive()5+ | () => void | Listens for page suspension. | The page is suspended. |
| onNewRequest()5+ | () => void | Listens for a new FA request. | The FA has been started and a new request is received. |
The lifecycle functions of page A are called in the following sequence: - Open page A: onInit() -> onReady() -> onShow()
Open page B on page A: onHide()
Go back to page A from page B: onShow()
Exit page A: onBackPress() -> onHide() -> onDestroy()
Hide page A: onInactive() -> onHide()
Show background page A on the foreground: onShow() -> onActive()
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