How to download PDF and store it locally on iPhone?

Question

I am able to successfully view a PDF from a website. I want to be able to download that PDF to the device, then access that file locally.

When the app is opened, it will check the online PDF's date. If it is newer than the locally-stored PDF, the app will download the new one, otherwise it opens the locally-stored PDF.

The code I am currently using:

PDFAddress = [NSURL URLWithString:@"http://www.msy.com.au/Parts/PARTS.pdf"]; request = [NSURLRequest requestWithURL:PDFAddress]; [webView loadRequest:request]; webView.scalesPageToFit = YES; 

How am I able to achieve this?

Answer 1

I have found one method which I tried myself:

// Get the PDF Data from the url in a NSData Object NSData *pdfData = [[NSData alloc] initWithContentsOfURL:[     NSURL URLWithString:@"http://www.example.com/info.pdf"]];  // Store the Data locally as PDF File NSString *resourceDocPath = [[NSString alloc] initWithString:[     [[[NSBundle mainBundle] resourcePath] stringByDeletingLastPathComponent]         stringByAppendingPathComponent:@"Documents" ]];  NSString *filePath = [resourceDocPath      stringByAppendingPathComponent:@"myPDF.pdf"]; [pdfData writeToFile:filePath atomically:YES];   // Now create Request for the file that was saved in your documents folder NSURL *url = [NSURL fileURLWithPath:filePath]; NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];  [webView setUserInteractionEnabled:YES]; [webView setDelegate:self]; [webView loadRequest:requestObj]; 

This will store your PDF locally and load it into your UIWebView.

Answer 2

In Swift 4.1

// Url in String format let urlStr = "http://www.msy.com.au/Parts/PARTS.pdf"  // Converting string to URL Object let url = URL(string: urlStr)  // Get the PDF Data form the Url in a Data Object let pdfData = try? Data.init(contentsOf: url!)  // Get the Document Directory path of the Application let resourceDocPath = (FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)).last! as URL  // Split the url into a string Array by separator "/" to get the pdf name let pdfNameFromUrlArr = urlStr.components(separatedBy: "/")  // Appending the Document Directory path with the pdf name let actualPath = resourceDocPath.appendingPathComponent(pdfNameFromUrlArr[     pdfNameFromUrlArr.count - 1])  // Writing the PDF file data to the Document Directory Path do {     _ = try pdfData.write(to: actualPath, options: .atomic)  }catch{      print("Pdf can't be saved") }  // Showing the pdf file name in a label lblPdfName.text = pdfNameFromUrlArr[pdfNameFromUrlArr.count - 1]  // URLRequest for the PDF file saved in the Document Directory folder let urlRequest = URLRequest(url: actualPath)  webVw.isUserInteractionEnabled = true webVw.delegate = self webVw.loadRequest(urlRequest) 

If you want to save the Pdf's in a particular folder/directory inside Main Document Directory

let resourceDocPath = (FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)).last! as URL  // The New Directory/folder name let newPath = resourceDocPath.appendingPathComponent("QMSDocuments")  // Creating the New Directory inside Documents Directory do {     try FileManager.default.createDirectory(atPath: newPath.path, withIntermediateDirectories: true, attributes: nil) } catch let error as NSError {     NSLog("Unable to create directory \(error.debugDescription)") }  // Split the url into a string Array by separator "/" to get the pdf name pdfNameFromUrlArr = urlStr.components(separatedBy: "/")  // Appending to the newly created directory path with the pdf name actualPath = newPath.appendingPathComponent(pdfNameFromUrlArr[pdfNameFromUrlArr.count - 1]) 

Happy Coding :)