HarmonyOS鸿蒙Next中父组件直接调用子组件的方法
HarmonyOS鸿蒙Next中父组件直接调用子组件的方法
子组件：
@Component
export struct Child{
......
hello(){}
}
父组件：
@Component
export struct Parent{
......
build(){
Child()
}
}
期望在某个事件中调用Child的hello()方法，是否可行。这种编程思想是否符合鸿蒙的编程规范，如果不符合，有什么建议能够实现这种效果。
2 回复
可以通过controller来实现，参考这段代码
@Component
struct Child {
@State private text: string = '初始值'
private controller: ChildController = new ChildController();
aboutToAppear() {
if (this.controller) {
this.controller.changeText = this.changeText
}
console.log('aaa')
}
private changeText = (value: string) => {
this.text = value
console.log('bbb')
}
build() {
Column() {
Text(this.text)
}
}
}
class ChildController {
changeText = (value: string) => {
console.log('11111')
}
}
export let ChildRef = new ChildController()
@Component
@Entry
struct Parent {
@State noShow: boolean = false
build() {
Column() {
Text('获取Child的exposeMethods!').fontSize('18vp').fontColor(Color.Gray)
Divider()
Child({ controller: ChildRef })
Child()
Button('Parent调用childer的changeText').onClick(() => {
ChildRef.changeText('Parent调用childer的changeText')
})
}
}
}
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