harmony 鸿蒙ArkUI Subsystem Changelog
ArkUI Subsystem Changelog
Restrictions on Using Decorators
1. Restrictions on Using Component Decorators
Component decorators @Component, @Entry, @Preview, and @CustomDialog apply only to structs, not classes.
Example
@Component
// ERROR:The '@Component' decorator can only be used with 'struct'.
class Index {
build() {
}
}
Change Impact
If @Component, @Entry, @Preview, or @CustomDialog is used to decorate components other than structs, a compile time error will occur.
Key API/Component Changes
N/A
Adaptation Guide
Use @Component, @Entry, @Preview, and @CustomDialog to decorate only structs.
2. Restrictions on Using Component Member Variable Decorators
Component member variable decorators @State, @Prop, @Link, @Provide, @Consume, @ObjectLink, @StorageLink, @StorageProp, @LocalStorageLink, @LocalStorageProp, @Watch, and @BuilderParam can decorate only the member variables of structs.
Example
@Component
class Index {
// ERROR: The '@State' decorator can only be used with 'struct'.
@State message: string = 'Hello world'
build() {
}
}
Change Impact
If any of the aforementioned component member variable decorators is used to decorate a member variable of components other than structs, a compile time error will occur.
Key API/Component Changes
N/A
Adaptation Guide
Use the aforementioned component member variable decorators to decorate only the member variables of structs.
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