app-FitLife1/myapp/src/app/tab3/tab3.page.ts

import { Component } from '@angular/core';
import { AlertController } from '@ionic/angular';

@Component({
  selector: 'app-tab3',
  templateUrl: 'tab3.page.html',
  styleUrls: ['tab3.page.scss'],
  standalone: false,
})
export class Tab3Page {
  isLoggedIn: boolean = false;
  isDarkMode: boolean = false;

  constructor(private alertController: AlertController) {}

  // 登录函数
  async login() {
    const alert = await this.alertController.create({
      header: '登录',
      inputs: [
        { name: 'username', type: 'text', placeholder: '账号' },
        { name: 'password', type: 'password', placeholder: '密码' }
      ],
      buttons: [
        { text: '取消', role: 'cancel' },
        { 
          text: '登录', 
          handler: () => {
            this.isLoggedIn = true;
            return false; // 防止弹窗自动关闭
          }
        }
      ]
    });

    await alert.present();
  }

  // 登出函数
  logout() {
    this.isLoggedIn = false;
  }

  // 切换主题
  toggleTheme() {
    this.isDarkMode = !this.isDarkMode;
    // 保存主题偏好到本地存储
    localStorage.setItem('theme', this.isDarkMode ? 'dark' : 'light');
  }

  // 初始化主题（如果之前有设置过）
  ngOnInit() {
    const savedTheme = localStorage.getItem('theme');
    if (savedTheme === 'dark') {
      this.isDarkMode = true;
    }
  }
}