如何快速將UIImage中的PDF放入PDFView中？

Question

我有一個捕獲圖像並將其轉換為pdf的應用程序。 然后將其顯示在PDFView中。 但是，PDF不適合我的PDFView的尺寸。 如何縮放pdf以適合PDFView？

從imagePickerController中選擇圖像時，將執行以下功能：

// OUTLETS
@IBOutlet weak var myPDFView: PDFView!


 func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

    print("image selected ...")
    // Get picked image info dictionary
    let image = info[UIImagePickerControllerOriginalImage] as! UIImage

    // Add captured and selected image to your Photo Library
    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)

    // Create PDFDocument object and display in PDFView
    let document = createPDFDataFromImage(image: image)

    myPDFView.document = document
    myPDFView.scaleFactorForSizeToFit

    // Dimiss imagePicker
    dismiss(animated: true, completion: nil)

}


  func createPDFDataFromImage(image: UIImage) -> PDFDocument{

    let document = PDFDocument.init()
    let imagePDF = PDFPage.init(image: image)

    document.insert(imagePDF!, at: 0)
    return document
}

Answer 1

您可以將autoScales設置為true

這是我的代碼

pdfView.document = createPDF(image: #imageLiteral(resourceName: "Image-1"))

pdfView.minScaleFactor = 0.1
pdfView.maxScaleFactor = 5

pdfView.autoScales = true
pdfView.displayMode = .singlePageContinuous
pdfView.displayDirection = .vertical

然后從這樣的圖像創建PDFPage：

func createPDF(image: UIImage) -> PDFDocument {
    let document = PDFDocument()

    guard let cgImage = image.cgImage else { return document }

    let image = UIImage(cgImage: cgImage, scale: image.scale, orientation: .downMirrored)

    guard let imagePDF = PDFPage(image: image) else { return document }

    document.insert(imagePDF, at: document.pageCount)

    return document
}