PDF is one of the most popular file formats in the world, and viewing PDF files is supported on almost all devices and operating systems out of the box. In the. Apple's PDFKit framework provides a huge range of code to help us work with PDFs, and one of the most useful is PDFView – it renders PDFs. iOS has built-in APIs for drawing PDFs, which means it's relatively straight forward to render a PDF to an image. I say "relatively" because.
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I've been working on an App that requires me to download PDF files, store it, and to view it. To accomplish the task, there are three main topics. If you simply want to view a PDF file you can load it into a UIWebView. let url: NSURL! = NSURL(string. Swift PDF, free and safe download. Swift PDF latest version: Combine any of your image files into a single PDF file. Swift PDF is a helpful, free Windows program.
No thanks Submit review. String]], totalAmount: Enamul Haque Enamul Haque 2 Install now to protect your privacy. The following screenshot demonstrates that view controller:
Some of the features included are:. The sample document is loaded from the app bundle, but the PTDocumentViewController class can also open files from other locations.
You can view and download the full source code for this article here. If you have any questions about integrating PDFTron into your project, please feel free to contact us and we'll be more than happy to help! Some test text! Contact Sales. Learn more. AI A document understanding platform for intelligent, automated data extraction from virtually any document.
Learn how to add powerful document processing functionality into your software. Get the answers you need. Web Web. Resources Subscription Sign in. Once you do so, open it in Xcode. This is also the place where you can initiate the creation of a new invoice by using the plus bar button to the top-right side of the screen.
Finally, a created invoice can be deleted by swiping to the left on a cell. The following screenshot demonstrates that view controller:. As I said, a new invoice can be created by tapping on the plus button.
That action takes us to a new view controller called CreatorViewController which looks like that:. An invoice has generally a variety of values needed to be filled in before it can be printed.
Some of those values can be set manually in that view controller, some others are calculated automatically, and some others will be hardcoded later in code.
To make that specific, the values that can be manually added in our demo app are:. Regarding the invoice items, a new view controller named AddItemViewController exists in the project for allowing easy data entry. There are two textfields only for filling the respective values in, and a save button to add them to the invoice and return to the previous view controller:. All the invoice items are appended to an array of dictionaries , where each dictionary has two values: The description and the price of each item.
That array is used as the datasource for the tableview that lists all items in the CreatorViewController. When an invoice gets saved, then both the manually added data and the automatically calculated data is set to a dictionary and being returned to the InvoiceListViewController. Upon saving an invoice the next invoice number is calculated and stored for future use in the user defaults dictionary NSUserDefaults.
The dictionary with the data of a new invoice is appended to an array in the InvoiceListViewController , and that array is stored to the user defaults as well every time a new one is created by the user.
The invoice data is loaded from the user defaults when that view controller is about to appear. There are definitely better ways to store your data. I have almost nothing to comment regarding the existing code, and all you have to do is to go through each view controller or follow the flow of the app so as you see the details of the implementation. One for getting easy access to the application delegate, one for getting the path to the documents directory, and one for converting an amount represented as a string into a currency string the amount along with the proper currency symbol.
Use it to set your own currency code. By tapping on an existing invoice in the tableview in the InvoiceListViewController , a dictionary containing the data of the matching invoice is passed to the PreviewViewController view controller. These functionalities do not exist in the starter project and we will start implementing them, taking as granted that all the data we need regarding an invoice already exists in the PreviewViewController and we can use it directly.
The primary logic here is to put placeholders in the HTML files in certain points, and then replace those placeholders with real data. But in order to do that, we must find or create custom HTML forms that will give us eventually the desired result.
The first one contains the code that will produce the entire invoice, except for the lines of the items. We have two other templates for the items specifically: A placeholder inside any HTML template file will be a special keyword surrounded by symbols. For example, the next extract show the placeholders for the invoice number, issue date and due date:.
You can find all placeholders inside the three HTML files, and the position where each placeholder fits to. Also, the ITEMS placeholder will be replaced once the respective code for all items has been created by using the two extra HTML template files details about that in the proper time. The main and most important task in this part is the replacement of the placeholder values in the invoice HTML template files with real values.
Those real values are actually the data matching to the selected invoice in the InvoiceListViewController that pass to the PreviewViewController. Proceed with the guide and get finished with the new file creation.
With the InvoiceComposer. In a real app of course, these would consist of values that users should be able to set or change.
Needless to say that you are totally free to set your own values in the above properties for example, set your own info in the senderInfo property. We can now proceed and create a new method that will do the important work of replacing the placeholder values in the HTML template files.
The parameters are actually all the values that can be manually set when creating an invoice in the demo app, and they are all we need in order to generate the invoice along with the hardcoded values as properties of this class. In the following snippet, two significant things are taking place: At first the template content from the invoice.
There are comments that will help you go through it:. Replacing a placeholder value is as simple as it looks in the code above.
Further than that, notice that all the work is taking place inside a do-catch statement, as the initialisation of the HTMLContent string with the contents of a file can throw an exception. At the end that string is returned from the method.
The template code has been modified appropriately in order to produce an invoice with real content. Therefore, our goal in this part is to load the composed HTML string to the web view existing in the PreviewViewController , and watch the results of our previous efforts. We mostly do it here for the sake of the completeness of the demo app. Switch now to the PreviewViewController. Once we get an actual HTML string back from that method not a nil value , we load it to the web view.
Then select it from the list by tapping on it, and watch the invoice content appearing on the web view, like the one shown below:. With the half of the job already done, we can start working in the printing process which will become our way to export an invoice to PDF. Those drawing methods can be overridden by subclassing the UIPrintPageRenderer class only, but it worths the extra effort as we gain great flexibility and control over the content that will be printed to the actual page, the header or the footer.
So, back to Xcode again, create a new class following same steps as before. Two things to take care about:. Once you have it ready at that point you should be able to see a new file in the Project Navigator called CustomPrintPageRenderer.
The above values describe the precise width and height of the normal, common A4 page that is used all over the world for printing. The above consists of a quite straightforward, and at the same time a standard technique for setting the frame of the paper and the area where content will be printed.
In that snippet, you can see that we made the paper frame and the printable area equal. In that case, you could just replace the last line with the next one:.
The above adds an offset of 10 points to both horizontal and vertical axis. In other words, you should never forget to set the paper and printable area of your printing object. Once that happens, the drawn content can be sent either to a real printer or stored to a file. That is the print formatter UIPrintFormatter class. UIPrintFormatter is an abstract base class for print formatters: Given a print formatter, the printing system can automate the printing of the type of content associated with the print formatter.
That means for us that simply by adding the HTML content as a print formatter to the print page renderer, the iOS printing system will take over of the layout and actual printing to the page. I would advice you to take a look at this page for more information, as everything is explained there.
More details about it and for the rest subclasses can be found in the link above. In a more complicated app you can use multiple print formatter objects, and specify of course different starting pages for each formatter. But for now, the above is just fine for making our point clear. At first we initialise a mutable data object, so the PDF output data can be written to it. Next, we begin the creation of a new PDF page, but the actual drawing is taking place with that line:.
With that line, the print page renderer object that comes as an argument to the method will draw its contents inside the frame of the PDF context.
Note that any custom header or footer will be automatically drawn as well, as the drawPageAtIndex The above method prints a single page. However, in case you need to print multiple pages, then you can include the beginning of the PDF page creation and the print page renderer drawing into a loop. Keep that in mind in case you want to extend this demo app or make one of yours and you desire multiple pages to be printed in a single PDF file. At that point all the tasks related to PDF export have come to their end.
Open the PreviewViewController.