Creating PDF from UIView in Swift - swift

Question

I have been stuck/ researching this problem for days, the method below successfully creates the pdf from a regular size UIView. However, I need the contents of my containerView that is located inside a UIScrollview. The height of my containerView is 5000. Can someone help me to render the containerView into multiple PDF pages or direct me to a better way of doing this. `func exportAsPdfFromView() -> String {
func screenShotScrollview() -> String {
let scrollView = waiverViews.scrollView
let pageDimensions = scrollView.bounds
let pageSize = pageDimensions.size
let totalSize = scrollView.contentSize
let numberOfPagesThatFitVertivally = Int(ceil(totalSize.height/pageSize.height))
let outputData = NSMutableData()
UIGraphicsBeginPDFContextToData(outputData, pageDimensions, nil)
let savedContentOffset = scrollView.contentOffset
let savedContentInset = scrollView.contentInset
scrollView.contentInset = UIEdgeInsets.zero
let origin = CGRect(x: 0, y: 0, width: pageSize.width, height: pageSize.height)
if let context = UIGraphicsGetCurrentContext() {
for indexVertical in 0..<numberOfPagesThatFitVertivally {
UIGraphicsBeginPDFPageWithInfo(origin, nil)
let offsetVertical = CGFloat(indexVertical) * pageSize.height
scrollView.contentOffset = CGPoint(x: 0, y: offsetVertical)
context.translateBy(x: 0, y: -offsetVertical)
scrollView.layer.render(in: context)
}
UIGraphicsEndPDFContext()
scrollView.contentInset = savedContentInset
scrollView.contentOffset = savedContentOffset
}
return self.saveViewPdf(data: outputData)
}

Answer 1

Essentially, a scrollView would not want to render all contents to its layer all the time, until it is being viewed.
I am guessing this is returning just the snapshot of the UIScrollView's current window?
To take multiple snapshots of the whole contentBounds of the UIScrollView, you could potentially, setTheContentOffset of the scrollview in its total contentBounds.height/frame.height which would return the pages. And then generate PDFs within the loop?
for instance something like this, and then UX wise, hide the scroll view. While this is being generated, unhide it when it is complete.
for i in 0..<pages {
scrollView.setContentOffset(.init(x: 0, y: i*scrollViewHeight))
//PDF Generation flow
//set the url to something like "pdf_file_\(i).pdf"
}