HarmonyOS 唤起自定义弹窗crash

封装全局自定义Dialog唤起Dialog时，App Crash如果CustomDialogController对象在Component内部创建不会发生问题。但是这样特别不方便，需要封装全局Dialog组件，期望能够有封装导出一个全局的唤起dialog的方法，任何需要唤起dialog的地方，能够一键调用方法实现。

1、在页面组件中需要唤起dialog。

2、封装唤起dialog的方法。

export function showExitAppDialog() {
  const exitAppDialogController = new CustomDialogController({
    builder: IOSConfirm({
      onConfirm: () => {
        ExitAppDialog.exitApp()
      },
      message: ExitAppDialog.getExitAppMessage()
    }),
    cancel: () => {
    },
    autoCancel: true,
    customStyle: true,
    alignment: DialogAlignment.Center
  })
  exitAppDialogController.open()
}
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3、执行上面exitAppDialogController.open()这行代码时，app发生闪退。

4、闪退日志如下：

Process name:xxx
Process life time:18s
Reason:Signal:SIGSEGV(SEGV_MAPERR)@0x00000000000007c0 probably caused by NULL pointer dereference
Fault thread info:
  Tid:xxx, Name:xxx
#00 pc 0000000001b19b58 /system/lib64/platformsdk/libace_compatible.z.so(f4b73469d622179475c71aae4f4d7f87)
#01 pc 0000000001b1b964 /system/lib64/platformsdk/libace_compatible.z.so(f4b73469d622179475c71aae4f4d7f87)
#02 pc 00000000004aa778 /system/lib64/platformsdk/libark_jsruntime.so(d5019ef32b39e74d9fa0055a25f604a8)
#03 pc 00000000002dc680 /system/lib64/module/arkcompiler/stub.an(RTStub_PushCallArgsAndDispatchNative+40)
#04 at showExitAppDialog (Phone|corpfoundation|1.0.0|src/main/ets/view/ExitAppDialog.ts:49:5)
#05 at onBackPress (Phone|corphome|1.0.0|src/main/ets/pages/CorpHomeIndex.ts:382:9)
#06 at anonymous (Phone|corphome|1.0.0|src/main/ets/pages/CorpHomeIndex.ts:352:24)
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