HarmonyOS 监听手机物理返回键

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