![]() In our case, it didn’t affect user experience in the end. ![]() However, it caused performance issues, so in the final implementation we decided to stuck with just regular touch events and skipped coalesced and predicted touches. We tried to forward the gesture recognizer’s delegate not only the location of current touch, but also the arrays of coalesced and predicted touches. Various annotation can be added like Circle, line, Strikeout, Square, Underline, Highlight etc. #Swiftui pdfkit pdfHowever, you must remove any drawing used data from predictedTouches when you receive the next touch event. PDFKit provides option to add annotation to PDF file using PDFAnnoation class. In the Project navigator, click to select ContentView.swift. If the canvas isnt visible, select Editor > Editor and Canvas to show it. In the canvas, click Resume to display the preview. Choose a location to save the project on your Mac. iOS would also try to predict the user’s finger or pencil movement and create a predictedTouches array for each UIEvent.Īccording to Apple’s documentation, you could store coalescedTouches and use them for drawing. Enter SwiftUICustomizeNavBarTutorial as the Product Name, select the Use SwiftUI checkbox, and click Next. If your app needs better precision, you could access all touches by checking UIEvent's coalescedTouches property. Due to different device hardware and to improve performance, only some touch events are being received by the gesture recognizer in real-time. We also found a few bugs, which lead to crashes (inside the Framework), and lack of documentation and tutorials or examples.Įach touch event ( UIEvent) from our gesture recognizer also has coalesced and predicted touch arrays. However, I’d spent a lot of time making drawings, touches, and annotations work as expected. It actually seems to be ‘‘magical’’ framework to solve our task in just a few lines of code. It includes views for PDF documents and thumbnails with built-in gestures support and lot of animations. Of course, we understood it wouldn’t be an easy task, but we never imagined quite how challenging it would be.Īt first sight, PDFKit looks like any other Apple’s framework included in iOS SDK. ![]() The key feature of this viewer was the ability to add annotations to a PDF file with a finger or Apple Pencil. My team recently started a new project: to develop a new iOS app with a built-in PDF Viewer. The third article is about creating PDF document on devices, and inserting and removing pages.The second is about PencilKit, Text annotations and auto-saving.We’ll start with PDFKit basics and will create first Ink annotations in the end of this tutorial. #Swiftui pdfkit how toSo in this article I’ll write about PDF specific stuff as the image gallery was a better example of how to scroll views efficiently.This is my first article about Apple’s PDFKit. I wrote about scrolling images in a UIScrollView in another post ![]() Let’s start with the UIScrollView containing views with single PDF pages.Īs I mentioned before this was the solution I had to implement a few years ago, I cut some corners for the Swift porting as I don’t expect to use this in production now that iOS supports it in the framework. Using a Webview is so simple I didn’t feel the need to write the example, I’m sure there are tons of them available. Where I put two implementations: the scrollview with PDF pages and the one with PDFView. An object that encapsulates the functionality of PDF Kit into a single widget that you can add to your application using Interface Builder. #Swiftui pdfkit codeRecently I wanted to port my Objective-C code to Swift and I decided to share the implementation, so I created this GitHub project I started working on the custom solution back when we didn’t have WKWebViews nor PDF Kit, so my only alternatives were displaying PDFs in a UIWebView or implementing a custom solution. The third alternative is drawing PDF pages and place them on a UIScrollView. In iOS 11 Apple introduced a new class PDFView, a subclass of UIView that comes with a configuration, so you can have side-by-side pages, vertical and horizontal scrolling and many more options. I said we have 3 ways to show the PDF and we just saw one, so what are the remaining two? The only downside is the scrolling is only vertical, which is fine for most apps but you may want to provide some customisations, for example the ability to scroll horizontally and to have two pages side-by-side in landscape. Just like loading a local page, or a remote one, you can provide the URL of the PDF and the WKWebView will take care of it. There are three possible ways of displaying a PDF. It could be a privacy policy document, an invoice, a flyer the company distributes on paper and via its app, a magazine. Showing PDFs is pretty common for an iOS app. ![]()
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