Ionic 6 ionViewWillEnter无法读取未定义的属性0

import { Component, OnInit } from '@angular/core';
import { NavController } from '@ionic/angular';

@Component({
  selector: 'app-my-page',
  templateUrl: './my-page.page.html',
  styleUrls: ['./my-page.page.scss'],
})
export class MyPagePage implements OnInit {
  myData: any;

  constructor(private navCtrl: NavController) {}

  ngOnInit() {
    this.loadData();
  }

  loadData() {
    // 模拟异步数据加载
    setTimeout(() => {
      this.myData = { key: 'value' };
    }, 1000);
  }

  ionViewWillEnter() {
    if (this.myData) {
      console.log(this.myData.key); // 现在可以安全地访问myData
    } else {
      console.log('Data is not ready yet.');
    }
  }
}

ionViewWillEnter() {
  console.log(this.myData?.key); // 如果myData未定义，则不会抛出错误
}