SwiftUI ImageRenderer: Tips on how to Create PDF Paperwork


Earlier, we confirmed you use ImageRenderer to seize a SwiftUI view and put it aside as a picture. This new class, launched in iOS 16, can even allow you to convert a view right into a PDF doc.

On this tutorial, we’ll construct on the highest of the earlier demo and add the Save to PDF perform. To observe this tutorial, please use Xcode 14 beta 3 (or up).

Revisit the Demo App

Should you haven’t learn the earlier tutorial, I counsel you to test it out first. It already lined the fundamentals of ImageRenderer and defined the implementation of the demo app.

swiftui-imagerenderer-pdf-demo

I’ve made some modifications to the demo app by including a heading and a caption for the road chart. The demo app now additionally comes with a PDF button for saving the chart view in a PDF doc. You may seek advice from the code of the ChartView struct under:

Saving the Chart View as a PDF Doc Utilizing ImageRenderer

What we’re going to do is to create a PDF doc for the ChartView utilizing ImageRenderer. Whereas it solely takes a pair strains of code to transform a SwiftUI view into a picture, we’d like a bit of extra work for PDF rendering.

For picture conversion, you’ll be able to entry the uiImage property to get the rendered picture. To attract the chart right into a PDF, we’ll use the render methodology of ImageRenderer. Here’s what we’re going to implement:

  • Search for the doc listing and put together the rendered path for the PDF file (e.g. linechart.pdf).
  • Put together an occasion of CGContext for drawing.
  • Name the render methodology of the renderer to render the PDF doc.

For the implementation, we create a brand new methodology named exportPDF. Beneath is the code of the strategy :

The primary two strains of the code retrieves the doc listing of the consumer and arrange the file path of the PDF file (i.e. line chart.pdf). We then create the occasion of CGContext. The mediaBox parameter is about to nil. On this case, Core Graphics makes use of a default web page dimension of 8.5 by 11 inches (612 by 792 factors).

The renderer closure receives two parameters: the present dimension of the view, and a perform that renders the view to the CGContext. To start the PDF web page, we name the context’s beginPDFPage methodology. The renderer methodology attracts the chart view. And do not forget that you have to shut the PDF doc to finish the entire operation.

To name this exportPDF methodology, we create a PDF button like this:

You may run the app in a simulator to have a check. After you faucet the PDF button, it’s best to see the next message within the console:

Should you open the file in Finder, it’s best to see a PDF doc like under.

swiftui-line-chart-pdf

To regulate the place of the drawing, you’ll be able to insert this line of code earlier than calling renderer:

This may transfer the chart to the higher a part of the doc.

swiftui-line-chart-adjusted

Make the PDF file obtainable to the Recordsdata app

It’s possible you’ll marvel why the PDF file can’t be discovered within the Recordsdata app. Earlier than you can also make the file obtainable to the built-in Recordsdata app, you need to change a few the settings in Information.plist. Swap to Information.plist and add the next keys:

  • UIFileSharingEnabled – Software helps iTunes file sharing
  • LSSupportsOpeningDocumentsInPlace – Helps opening paperwork in place

Set the worth of the keys to Sure. When you allow each choices, run the app on the simulator once more. Open the Recordsdata app and navigate to the On My iPhone location. You need to see the app’s folder. Contained in the folder, you can find the PDF doc.

swiftui-files-app-pdf

If you’re fascinated with diving deeper into SwiftUI, take a look at our Mastering SwiftUI e-book.


Founding father of AppCoda. Writer of a number of iOS programming books together with Starting iOS Programming with Swift and Mastering SwiftUI. iOS App Developer and Blogger. Observe me at Fb, Twitter and Google+.



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