![]() ![]() 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. However, you must remove any drawing used data from predictedTouches when you receive the next touch event. 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. ![]() I remember that UIWebView didn't have it originally and it was added later. 2) User Interface of this app should support iPhone and iPad (all screen sizes and device models, including app multitasking split-view with other apps) 3) Only a minimal test app and functional UI is needed to test the Reader on our side. No, but hopefully Apple will add this in the future. It should be based in the PDFKit framework available in iOS +11. If your app needs better precision, you could access all touches by checking UIEvent's coalescedTouches property. Does PDFKit on iOS expose a PDFView's underlying UIScrollView. 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. For more on Core Text, see our Core Text. For more on PDFKit, look at Apple's PDFKit Documentation and the Introducing PDFKit on iOS WWDC 2017 session. In the process, you learned to create a PDF, work with Core Text and Core Graphics and share the created document.
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