HarmonyOS 如何拦截系统的返回事件？

Question

在router开启的page中如何拦截系统的返回事件

Answer 1

通过onBackPress事件拦截，返回true表示页面自己处理返回逻辑

@Entry
@Component
struct IndexComponent {
  @State textColor: Color = Color.Black;

  onPageShow() {
    this.textColor = Color.Blue;
    console.info('IndexComponent onPageShow');
  }

  onPageHide() {
    this.textColor = Color.Transparent;
    console.info('IndexComponent onPageHide');
  }

  onBackPress() {
    this.textColor = Color.Red;
    console.info('IndexComponent onBackPress');
    return true
  }

  build() {
    Column() {
      Text('Hello World').fontColor(this.textColor).fontSize(30).margin(30)
    }.width('100%')
  }
}

参考链接 https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/ts-custom-component-lifecycle-V5\#onbackpress