harmony 鸿蒙QRCode

2022-08-09
浏览 (744)

QRCode

The <QRCode> component is used to display a QR code.

NOTE

This component is supported since API version 7. Updates will be marked with a superscript to indicate their earliest API version.

The pixel count of the <QRCode> component is subject to the content. If the component size is not large enough, the content may fail to be displayed. In this case, you need to resize the component.

Child Components

Not supported

APIs

QRCode(value: string)

Since API version 9, this API is supported in ArkTS widgets.

Parameters

Name	Type	Mandatory	Description
value	string	Yes	Content of the QR code. A maximum of 256 characters are supported. If this limit is exceeded, the first 256 characters are used. NOTE The string cannot be null, undefined, or empty.

Attributes

In addition to the universal attributes, the following attributes are supported.

Name	Type	Description
color	ResourceColor	Color of the QR code. Default value: Color.Black Since API version 9, this API is supported in ArkTS widgets. Since API version 11, the default value is changed to ’#ff182431’.
backgroundColor	ResourceColor	Background color of the QR code. Default value: Color.White Since API version 9, this API is supported in ArkTS widgets. Since API version 11, the default value is changed to ’#ffffffff’.
contentOpacity¹¹⁺	number \|Resource	Opacity of the QR code content. The minimum value is 0, and the maximum value is 1. Default value: 1

Events

Among the universal events, the click event, touch event, and show/hide event are supported.

Example

// xxx.ets
@Entry
@Component
struct QRCodeExample {
  private value: string = 'hello world'
  build() {
    Column({ space: 5 }) {
      Text('normal').fontSize(9).width('90%').fontColor(0xCCCCCC).fontSize(30)
      QRCode(this.value).width(140).height(140)

      // Set the color for the QR code.
      Text('color').fontSize(9).width('90%').fontColor(0xCCCCCC).fontSize(30)
      QRCode(this.value).color(0xF7CE00).width(140).height(140)

      // Set the background color for the QR code.
      Text('backgroundColor').fontSize(9).width('90%').fontColor(0xCCCCCC).fontSize(30)
      QRCode(this.value).width(140).height(140).backgroundColor(Color.Orange)

      // Set the opacity of QR code content.
      Text('contentOpacity').fontSize(9).width('90%').fontColor(0xCCCCCC).fontSize(30)
      QRCode(this.value).width(140).height(140).color(Color.Black).contentOpacity(0.1)
    }.width('100%').margin({ top: 5 })
  }
}

qrcode