[文章]HarmonyOS/OpenHarmony应用开发-ArkTS挂载卸载事件

一、示例效果图片

二、事件

挂载卸载事件指组件从组件树上挂载、卸载时触发的事件。（api7开始支持）

三、示例代码

appear.ets

import prompt from '@ohos.prompt';

@Component
export default struct AppearExample {
  @State isShow: boolean = true;
  @State changeAppear: string = 'Hide Text';
  private myText: string = 'Text for onAppear';

  build() {
    Column() {
      Button(this.changeAppear)
        .onClick(() => {
          this.isShow = !this.isShow;
        }).margin(15)
      if(this.isShow) {
        Text(this.myText).fontSize(26).fontWeight(FontWeight.Bold)
          .onAppear(() => {
            this.changeAppear = 'Hide Text';
            prompt.showToast({
              message: 'The text is shown',
              duration: 2000
            })
          })
          .onDisAppear(() => {
            this.changeAppear = 'Show Text';
            prompt.showToast({
              message: 'The text is hidden',
              duration: 2000
            })
          })
      }
    }.padding(30).width('100%')
  }
}复制复制

index.ets

import appear from '../eventMuster/appear'

@Entry
@Component
struct Index {

  build() {
    Column() {
      appear()
    }
    .width('100%')
    .height('100%')
  }
}复制复制

四、完整代码下载地址

https://gitee.com/jltfcloudcn/jump_to/tree/master/appear