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Creating PDFs on MacOS without UIKit
Greetings, this may be an odd question but I was not able to find an answer to this. So I am developing this pure MacOS program for a client and one thing he wants is to create some PDFs along the way. Great chance I thought to try out this fancy Swift 5 with SwiftUI and so far it's going great, most of the program is up and running but I've hit a wall with the PDF generation, which I thought would be one of the easiest parts. Since it's a pure MacOS program, UIKit is not available but there is not a single tutorial out there for generating PDFs which is not using UIKit to do it. It seems people only want to create PDFs on iOS. Can someone give me a small breakdown or starter or tutorial or skeleton on how I would do that? Thanks and have a nice day
Topic: App & System Services SubTopic: Core OS Tags:
4
0
2.0k
Jan ’22
WKWebView: loadHTMLString and createPDF always fails since updating to macOS Monterey
Hello, I had programmed and used a software for a year without problems but after updating to Monterey and updating XCode, the following, simplified Playground example of the process always fails and I cannot figure out why. Please note this project is specifically written for macOS and I cannot use the iOS libraries for PDF generation. import WebKit import PDFKit import SwiftUI import CoreGraphics let webView: WKWebView = WKWebView(frame: CGRect(x: 0, y: 0, width: 595.0, height: 842.0), configuration: WKWebViewConfiguration()) let htmlString = "<html><body><h1>Hello</h1></body></html>" webView.loadHTMLString(htmlString, baseURL: nil) webView.createPDF(completionHandler: compHandler) func compHandler(res: Result<Data, Error>) -> Void { print(res) } This always results in an error: failure(Error Domain=WKErrorDomain Code=1 "An unknown error occurred" UserInfo={NSLocalizedDescription=An unknown error occurred}) I cannot find anything in the documentation regarding this and most examples and questions are old and not applicable (many still using Objective-C). Debugging seems to suggest that the loadHTMLString itself fails, not even necessarily the PDF itself. Any pointers would be appreciated. Thanks
Topic: UI Frameworks SubTopic: SwiftUI Tags:
0
0
1.2k
Sep ’22
MacOS WKWebView createPDF and CGRect Frame doesn't behave as expected
Hey everyone, I am trying to generate a dynamically long multi-page PDF from a WKWebView with .createPDF() but the frame does not seem to make much of a difference. Here's what I'm doing: I create the WKWebView with an A4-width and correctly calculate the height of said View, then I split up that height into A4 heights and round it up. So let's say I get two pages. I take that view and create frames from it with A4PageHeight*PageNumber so I get the correct starting heights of 0 for page one, 595.0 for page two etc. Then I try to capture these frames to split up my document into multiple pages, combine them to a document and voilà. Here's the problem. It doesn't matter the starting height value, every capture always contains the entire Page, no matter what I do. I thought the frame would capture just a part of the page. public func createPDFPage(pageNumber: Int, totalNumber: Int) { numberOfPages = totalNumber let webConfiguration = WKWebViewConfiguration() let startHeight = CGFloat(pageNumber) * A4PageHeight let pageWidth = A4PageWidth let size = CGRect(x: 0, y: startHeight, width: pageWidth, height: A4PageHeight) let webView = WKWebView(frame: size, configuration: webConfiguration) webView.loadHTMLString(htmlString, baseURL: Bundle.main.resourceURL) let seconds = 2.0 DispatchQueue.main.asyncAfter(deadline: .now() + seconds) { webView.createPDF(completionHandler: successCompletionHandler) } } Results in 3 pages that look like this: Expected Output would have looked like this:
Topic: UI Frameworks SubTopic: SwiftUI Tags:
1
1
987
Nov ’22
Creating PDFs on MacOS without UIKit
Greetings, this may be an odd question but I was not able to find an answer to this. So I am developing this pure MacOS program for a client and one thing he wants is to create some PDFs along the way. Great chance I thought to try out this fancy Swift 5 with SwiftUI and so far it's going great, most of the program is up and running but I've hit a wall with the PDF generation, which I thought would be one of the easiest parts. Since it's a pure MacOS program, UIKit is not available but there is not a single tutorial out there for generating PDFs which is not using UIKit to do it. It seems people only want to create PDFs on iOS. Can someone give me a small breakdown or starter or tutorial or skeleton on how I would do that? Thanks and have a nice day
Topic: App & System Services SubTopic: Core OS Tags:
Replies
4
Boosts
0
Views
2.0k
Activity
Jan ’22
WKWebView: loadHTMLString and createPDF always fails since updating to macOS Monterey
Hello, I had programmed and used a software for a year without problems but after updating to Monterey and updating XCode, the following, simplified Playground example of the process always fails and I cannot figure out why. Please note this project is specifically written for macOS and I cannot use the iOS libraries for PDF generation. import WebKit import PDFKit import SwiftUI import CoreGraphics let webView: WKWebView = WKWebView(frame: CGRect(x: 0, y: 0, width: 595.0, height: 842.0), configuration: WKWebViewConfiguration()) let htmlString = "<html><body><h1>Hello</h1></body></html>" webView.loadHTMLString(htmlString, baseURL: nil) webView.createPDF(completionHandler: compHandler) func compHandler(res: Result<Data, Error>) -> Void { print(res) } This always results in an error: failure(Error Domain=WKErrorDomain Code=1 "An unknown error occurred" UserInfo={NSLocalizedDescription=An unknown error occurred}) I cannot find anything in the documentation regarding this and most examples and questions are old and not applicable (many still using Objective-C). Debugging seems to suggest that the loadHTMLString itself fails, not even necessarily the PDF itself. Any pointers would be appreciated. Thanks
Topic: UI Frameworks SubTopic: SwiftUI Tags:
Replies
0
Boosts
0
Views
1.2k
Activity
Sep ’22
MacOS WKWebView createPDF and CGRect Frame doesn't behave as expected
Hey everyone, I am trying to generate a dynamically long multi-page PDF from a WKWebView with .createPDF() but the frame does not seem to make much of a difference. Here's what I'm doing: I create the WKWebView with an A4-width and correctly calculate the height of said View, then I split up that height into A4 heights and round it up. So let's say I get two pages. I take that view and create frames from it with A4PageHeight*PageNumber so I get the correct starting heights of 0 for page one, 595.0 for page two etc. Then I try to capture these frames to split up my document into multiple pages, combine them to a document and voilà. Here's the problem. It doesn't matter the starting height value, every capture always contains the entire Page, no matter what I do. I thought the frame would capture just a part of the page. public func createPDFPage(pageNumber: Int, totalNumber: Int) { numberOfPages = totalNumber let webConfiguration = WKWebViewConfiguration() let startHeight = CGFloat(pageNumber) * A4PageHeight let pageWidth = A4PageWidth let size = CGRect(x: 0, y: startHeight, width: pageWidth, height: A4PageHeight) let webView = WKWebView(frame: size, configuration: webConfiguration) webView.loadHTMLString(htmlString, baseURL: Bundle.main.resourceURL) let seconds = 2.0 DispatchQueue.main.asyncAfter(deadline: .now() + seconds) { webView.createPDF(completionHandler: successCompletionHandler) } } Results in 3 pages that look like this: Expected Output would have looked like this:
Topic: UI Frameworks SubTopic: SwiftUI Tags:
Replies
1
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1
Views
987
Activity
Nov ’22