【ionic4】二维码功能

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使用ngx-qrcode2

1.安装依赖

npm install ngx-qrcode2 --save

2.新建页面：

ionic g page mealcode

3.引入模块(module.ts)

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { Routes, RouterModule } from '@angular/router';
import { IonicModule } from '@ionic/angular';
import { MealcodePage } from './mealcode.page';

import { NgxQRCodeModule } from 'ngx-qrcode2';

const routes: Routes = [
  {
    path: '',
    component: MealcodePage
  }
];

@NgModule({
  imports: [
    CommonModule,
    FormsModule,
    IonicModule,
    NgxQRCodeModule,
    RouterModule.forChild(routes)
  ],
  declarations: [MealcodePage]
})
export class MealcodePageModule {}

4.设置二维码内容（page.ts）

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

@Component({
  selector: 'app-mealcode',
  templateUrl: './mealcode.page.html',
  styleUrls: ['./mealcode.page.scss'],
})
export class MealcodePage implements OnInit {
  cardId="E000001";
  mealCode:string;//二维码内容变量
  constructor() { }

  ngOnInit() {
    this.createCode();
  }
  createCode() {
    this.mealCode = this.cardId;  
  }

}

5.在页面中显示（html）

<ngx-qrcode [qrc-value]="mealCode" qrc-class="card-code" qrc-errorCorrectionLevel="L"></ngx-qrcode>

6.效果图：