HarmonyOS 如何不在组件内打开自定义弹框

CustomDialogController仅在作为@CustomDialog和@Component struct的成员变量，且在@Component struct内部定义时赋值才有效，具体用法参考示例：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/ts-methods-custom-dialog-box-V5#customdialogcontroller

可以使用promptAction.openCustomDialog接口，全局调用自定义弹窗打开，文档参考：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-promptaction-V5#promptactionopencustomdialog11

参考示例如下：

1、GlobalContext.ets

export class GlobalContext {
  private constructor() {
  }

  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object | undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

2、DialogUtils.ets

import { promptAction } from '@kit.ArkUI'
import { GlobalContext } from './GlobalContext'

@Builder
export function customDialogBuilder(content: String) {
  Column() {
    Text(`Tip: ${content} `).fontSize(20).height("30%")
    Text('失败原因：失败原因失败原因失败原因失败原因失败原因失败原因失败原因!').fontSize(16).height("30%")
    Row() {
      Button("确认").onClick(() => {
        promptAction.closeCustomDialog(getCustomDialogId())
      })
      Blank().width(50)
      Button("取消").onClick(() => {
        promptAction.closeCustomDialog(getCustomDialogId())
      })
    }
    .margin({ top: 30 })
  }.height(200).padding(5)
}

function getCustomDialogId() {
  // 取customDialogId
  let customDialogId = GlobalContext.getContext().getObject('customDialogId') as number
  return customDialogId;
}

3、HttpUtil.ets

import { GlobalContext } from './GlobalContext';
import { promptAction } from '@kit.ArkUI';
import { customDialogBuilder } from './DialogUtils';

export function testPromptDialog() {
  // 方法调用后使用弹窗
  // 使用GlobalContext中UIContext
  const that = GlobalContext.getContext().getObject('UIContext') as UIContext;
  if (that) {
    promptAction.openCustomDialog({
      builder: customDialogBuilder.bind(that, "网络请求失败！")
    }).then((dialogId: number) => {
      GlobalContext.getContext().setObject('customDialogId', dialogId)
    })
  }
}

4、使用弹窗

@Entry
@Component
struct Index {
  aboutToAppear(): void {
    GlobalContext.getContext().setObject('UIContext', this)
    GlobalContext.getContext().setObject('customDialogId', 0)
  }

  build() {
    Button("promptAction弹窗")
      .onClick(() => {
        testPromptDialog()
      })
  }
}