ionic生命周期事件

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angular有一套生命周期事件:

https://angular.cn/guide/lifecycle-hooks

ionic也有,其更贴近app交互需求,在开发时应尽量使用ionic这套:

Page Event Returns Description
ionViewDidLoad void Runs when the page has loaded. This event only happens once per page being created. If a page leaves but is cached, then this event will not fire again on a subsequent viewing. TheionViewDidLoad event is good place to put your setup code for the page.
ionViewWillEnter void Runs when the page is about to enter and become the active page.
ionViewDidEnter void Runs when the page has fully entered and is now the active page. This event will fire, whether it was the first load or a cached page.
ionViewWillLeave void Runs when the page is about to leave and no longer be the active page.
ionViewDidLeave void Runs when the page has finished leaving and is no longer the active page.
ionViewWillUnload void Runs when the page is about to be destroyed and have its elements removed.
ionViewCanEnter boolean/Promise<void> Runs before the view can enter. This can be used as a sort of “guard” in authenticated views where you need to check permissions before the view can enter
ionViewCanLeave boolean/Promise<void> Runs before the view can leave. This can be used as a sort of “guard” in authenticated views where you need to check permissions before the view can leave

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