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在 React 中使用 Overlay 组件

¥Using Overlay Components in React

对于 Ionic React，你可以使用两种技术来显示叠加组件，例如模式、警报、操作表等。在本指南中，我们将介绍这两种技术。

¥For Ionic React, there are two techniques you can use to display overlay components like modals, alerts, action sheets, etc. In this guide, we will go over both of them.

覆盖钩子​

¥Overlay Hooks

从 Ionic React 5.6 开始，我们引入了新的 React hook，你可以使用它来控制显示和消除叠加层。这些钩子提供了一种控制叠加层的编程方式，以及一种在 Ionic 页面之外使用叠加层而无需状态管理系统的方法。

¥Starting in Ionic React 5.6, we introduced new React hooks you can use to control displaying and dismissing overlays. These hooks provide a programmatic way of controlling the overlays, as well as a way to use overlays outside of your Ionic Page without the need of a state management system.

要使用其中一个覆盖钩子，请从 @ionic/react 导入要使用的覆盖的钩子。例如，如果我们想使用警报覆盖，我们导入 useIonAlert：

¥To use one of the overlay hooks, you import the hook for the overlay you want to use from @ionic/react. For example, if we want to use the Alert overlay, we import useIonAlert:



import { useIonAlert } from '@ionic/react';


钩子返回一个数组，其中数组中的第一项是呈现钩子的方法，第二项是解除钩子的方法：

¥The hooks return an array, where the first item in the array is the method to present the hook, and the second is the method to dismiss the hook:

const [showAlert, hideAlert] = useIonAlert();
注意

当用户完成与叠加层的交互后，叠加层通常会自行消失，因此你可能不需要使用消除/隐藏方法。

¥Overlays often dismiss themselves when the user is done interacting with them, so you might not need to use dismiss/hide method.

要显示叠加层，你可以使用当前方法，我们将其解构为名称 showAlert。该方法接受一组根据每个覆盖而变化的参数，但通常，它们可以接受一组简单的通用参数或一个对象来指定其他选项。

¥To display the overlay, you use the present method, which we destructured to the name showAlert. The method takes in a set of parameters that vary depending on each overlay, but generally, they can either take in a simple set of common parameters or an object to specify additional options.

showAlert('Hello!', [{ text: 'Ok' }]);

对于 useIonAlert，第一个参数是要显示的消息，第二个参数是 AlertButtons 的数组，用于自定义警报将显示的按钮。

¥For useIonAlert, the first parameter is the message to display, and the second is an array of AlertButtons to customize the buttons the alert will show.

或者，你可以传入 AlertOptions 配置对象来提供其他参数，例如要添加到标记的 CSS 类、警报的标头以及警报解除时调用的回调：

¥Alternatively, you can pass in an AlertOptions config object to provide additional parameters, such as a CSS class to add to the markup, a header for the alert, and a callback that gets called when the alert is dismissed:

showAlert({
  cssClass: 'my-css',
  header: 'Alert',
  message: 'Hello!',
  buttons: ['Cancel', { text: 'Ok', handler: (d) => console.log('ok pressed') }],
  onDidDismiss: (e) => console.log('alert dismiss'),
});

显示附加自定义组件作为其标记一部分的覆盖钩子（例如 modals 和 popovers）在初始化其钩子时会接收一些附加参数。第一个参数是你希望覆盖层显示的组件，第二个参数是你要在构造组件时传递到组件中的附加属性的对象：

¥Overlay hooks that display additional custom components as part of their markup, such as modals and popovers, take in a couple of additional parameters when initializing their hooks. The first parameter is the component you want your overlay to display, and the second is an object of additional props you want to pass into the component when it gets constructed:

const [present, dismiss] = useIonModal(({ name }) => <div>Hello {name}.</div>, {
  name: 'Dave',
});

覆盖组件​

¥Overlay Components

还可以使用 @ionic/react 中的组件来显示叠加。这些组件采用你提供的 isOpen 属性来控制当前是否显示叠加层。当 isOpen 从 true 切换到 false（反之亦然）时，Ionic 将使用适当的动画打开/关闭叠加层。你还可以提供任何其他附加配置选项作为覆盖层的属性：

¥Overlays can also be displayed by using components from @ionic/react. The components take a isOpen prop that you provide to control if the overlay is currently being displayed or not. When isOpen switches from true to false (and vise versa), Ionic will open/close the overlay with the appropriate animation. You can also supply any other additional config options as props to the overlay:

<IonAlert isOpen={showAlert} message="Hello!" buttons={[{ text: 'Ok' }]} onDidDismiss={() => setShowAlert(false)} />

上面的 showAlert 布尔值是你的应用提供的一个状态。

¥Above, the showAlert boolean is a piece of state provided from your application.

当覆盖层被解除时，重要的是要绑定到 onDidDismiss 回调并设置状态变量以指示覆盖层不再显示。Ionic React 会查找 isOpen 属性的更改，以确定是否应显示覆盖层。

¥When the overlay is dismissed, it is important to tie into the onDidDismiss callback and set your state variable to indicate that the overlay is no longer presenting. Ionic React looks for changes to the isOpen prop to determine if the overlay should be displayed or not.

对于显示自定义组件（例如 modals 和 popovers）的覆盖层，你可以将该组件作为覆盖层组件的子组件提供：

¥For overlays that display custom components, such as modals and popovers, you provide the component as a child to the overlay component:

<IonModal isOpen={showModal}>
  <div>Hello!</div>
</IonModal>
注意

覆盖组件仍然是显示覆盖的有效方法，并且绝不是已弃用的方法。使用最适合你的应用的方法。

¥The Overlay Components are still a valid way of displaying overlays and are in no way a deprecated method. Use whichever method best fits your application.

Ionic 中的叠加层文档​

¥Docs for Overlays in Ionic

如需完整文档并查看钩子和组件方法的使用示例，请访问 Ionic 中每个覆盖层的文档页面：

¥For full docs and to see usage examples for both the hook and component approach, visit the docs page for each of the overlays in Ionic:

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