How to image write in pdf through html in Swift 4 - ios

Question

How to image write in pdf through html in Swift 4?
func createPDF(html: String, formmatter: UIViewPrintFormatter, filename: String) -> String
{
let fmt = UIMarkupTextPrintFormatter(markupText: sampleHTML)
// 2. Assign print formatter to UIPrintPageRenderer
let render = UIPrintPageRenderer()
render.addPrintFormatter(fmt, startingAtPageAt: 0)
render.drawPrintFormatter(formmatter, forPageAt: 0)
// 3. Assign paperRect and printableRect
let page = CGRect(x: 0, y: 0, width: 595.2, height: 841.8) // A4, 72 dpi
let printable = page.insetBy(dx: 0, dy: 0)
render.setValue(NSValue(cgRect: page), forKey: "paperRect")
render.setValue(NSValue(cgRect: printable), forKey: "printableRect")
// 4. Create PDF context and draw
UIGraphicsBeginPDFContextToData(pdfData, CGRect.zero, nil)
UIGraphicsBeginImageContext(CGSize.zero)
for i in 1...render.numberOfPages
{
UIGraphicsBeginPDFPage();
let bounds = UIGraphicsGetPDFContextBounds()
render.drawPage(at: i - 1, in: bounds)
}
UIGraphicsEndPDFContext();
// 5. Save PDF file
let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
print(documentsPath)
if pdfData.write(toFile: "\(documentsPath)/file.pdf", atomically: true)
{
pdfFilePath = "\(documentsPath)/file.pdf"
var URL = NSURL(fileURLWithPath: pdfFilePath!)
storedPdfFileData = try! Data(contentsOf:URL as URL)
fileName = URL.lastPathComponent
print("FileName\(fileName!)")
self.UserDefaultForfileName.setValue(self.fileName, forKey: "FILE")
}
else
{
print("choose how to handle error here")
}
return pdfFilePath!
}

Answer 1

If we have correctly understood, we can see two different requirements from your comments
1) you want to save the html pages to pdf.
or
2) you want to create pdf from images (list of UIImage).
for 1st approach:-
You should be using WKWebView to show html pages in your viewController. ( To know how to use WKWebView, you may search help from Stackoverflow. ) In the viewControler, you can have Button click event for 'printWebPagetoPDF" function. The function is as under.
func printWebPagetoPDF( theHeight:CGFloat = 0 ) {
var isHeightFound = true
let deviceW = UIScreen.main.bounds.size.width
let deviceH = UIScreen.main.bounds.size.height
let width = min(deviceW, deviceH)
var height = theHeight
if height <= 0 {
height = max(deviceW, deviceH)
isHeightFound = false
}
let fileParentPath = "<absolute path to save pdf file>" + "/"
let inDateTimeFormatter = DateFormatter()
inDateTimeFormatter.dateFormat = "yyyyMMddHHmm"
let dateTimeFileString = "test\(inDateTimeFormatter.string(from: Date()))"
let pdfFileName = dateTimeFileString + ".pdf"
let sharePdfFilePath = fileParentPath + pdfFileName
// - 1 - Grab the webView's print context
let fmt = myWKWebView.viewPrintFormatter()
fmt.perPageContentInsets = UIEdgeInsetsMake(10, 10, 10, 10) //Page margins
// - 2 - Assign print formatter to UIPrintPageRenderer
let render = UIPrintPageRenderer()
render.addPrintFormatter(fmt, startingAtPageAt: 0)
// - 3 - Assign paperRect and printableRect
let page = CGRect(x: 0, y: 0, width: width, height: height) //width: 841.85, height: 595.22) //Page size
let printable = page.insetBy(dx: 0, dy: 0)
render.setValue(NSValue(cgRect: page), forKey: "paperRect")
render.setValue(NSValue(cgRect: printable), forKey: "printableRect")
// - 4 - Create PDF context and draw
let pdfData = NSMutableData()
UIGraphicsBeginPDFContextToData(pdfData, page, nil)
print( render.numberOfPages )
render.prepare(forDrawingPages: NSMakeRange(0, render.numberOfPages-1))
for i in 0..<render.numberOfPages {
UIGraphicsBeginPDFPage()
render.drawPage(at: i, in: UIGraphicsGetPDFContextBounds())
}
UIGraphicsEndPDFContext()
// - 5 - Save the PDF file
let path = sharePdfFilePath
pdfData.write(toFile: path, atomically: true)
}
for 2nd approach:-
You may try following code to create pdf from images. I have not tested it properly, but you can try yourselves. mySelectedArray is the sequence of indexes of images to add in pdf. dataArray is array of UIImages. "import PDFKit" is required on start of swift file.
// The url to save the data to
let pdfFileName = "<some path>" + "/" + "test.pdf"
let url = URL(fileURLWithPath: pdfFileName)
if #available(iOS 11.0, *) {
// Create an empty PDF document
let pdfDocument = PDFDocument()
pdfDocument.delegate = self
for index in mySelectedArray {
// Load or create your UIImage
let image = dataArray[index].image
// Create a PDF page instance from your image
let pdfPage = PDFPage(image: image)
// Insert the PDF page into your document
pdfDocument.insert(pdfPage!, at: 0)
}
// Get the raw data of your PDF document
let data = pdfDocument.dataRepresentation()
// Save the data to the url
try! data!.write(to: url)
}
If possible, please comment clearly, for any further assistance.