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Zooming ​

Set the default zoom factor for displaying the PDF document, which defaults to 1.0 and is limited to the range of 1.0 to 5.0.

dart
Scaffold(
  resizeToAvoidBottomInset: false,
  appBar: AppBar(),
  body: CPDFReaderWidget(
    document: documentPath,
    configuration: CPDFConfiguration(
      readerViewConfig: const ReaderViewConfig(pageScale: 1.0)),
    onCreated: (controller) {},
  ));