harmony 鸿蒙\@ComponentV2 Decorator: Custom Component
\@ComponentV2 Decorator: Custom Component
To use the capability of the state variable decorator V2 in a custom component, you can use the \@ComponentV2 Decorator to decorate the custom component.
\@ComponentV2 is used together with state management V2. Before reading this topic, you are advised to read State Management Overview.
NOTE
The \@ComponentV2 decorator is supported since API version 12.
Overview
Similar to \@Component Decorator, the \@ComponentV2 decorator is used to decorate custom components.
In the custom component decorated by \@ComponentV2, only new state variable decorators can be used, including \@Local, \@Param, \@Once, \@Event, \@Provider, and \@Consumer.
Custom components decorated by \@ComponentV2 do not support component reuse and LocalStorage.
\@ComponentV2 and \@Component cannot be used to decorate the same struct.
\@ComponentV2 can use an optional parameter freezeWhenInactive of the boolean type to implement the component freezing.
A simple \@ComponentV2 decorated custom component should contain the following parts:
@ComponentV2 // Decorator struct Index { // Data declared by the struct build() { // UI defined by build } }
Unless otherwise specified, a custom component decorated by \@ComponentV2 maintains the same behavior as a custom component decorated by \@Component.
Constraints
For details about how to use the custom components decorated by \@Component and \@ComponentV2 together, see Mixing Use of Custom Components.
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