- 1、$$运算符为系统内置组件提供TS变量的引用，使得TS变量和系统内置组件的内部状态保持同步。
- 2、当前$$支持基础类型变量，以及@State、@Link和@Prop装饰的变量。
- 3、当前$$仅支持Refresh组件的refreshing参数
- 4、$$绑定的变量变化时，会触发UI的同步刷新
// xxx.ets
@Entry
@Component
struct RefreshExample {
@State isRefreshing: boolean = false
@State counter: number = 0
build() {
Column() {
Refresh({ refreshing: $$this.isRefreshing, offset: 120, friction: 100 }) {
Text('Pull Down and refresh: ' + this.counter)
.fontSize(30)
.margin(10)
}
.onStateChange((refreshStatus: RefreshStatus) => {
console.info('Refresh onStatueChange state is ' + refreshStatus)
})
.onRefreshing(() => {
setTimeout(() => {
this.counter++
this.isRefreshing = false
}, 1000)
console.log('onRefreshing test')
})
}
}
}
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