Swift3 ios10 Xcode8 saving and loading pdfs to and from device - swift

Question

(this is my first post here, I am sorry for any mistakes i have made)
i have code that works perfectly on the iOS simulator but once i run it on a real device it shows online a white screen and this error: com.apple.WebKit.WebContent: 113: Could not find specified service
this is my code for downloading a pdf file from firebase to the device:
#IBAction func downloadButtonPressed (sender: UIButton) {
print("zzz download button pressed")
let directoryPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true) //FileManager().url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
if directoryPath.count > 0 {
let documentsDirectory = directoryPath[0]
let pathURL = URL(fileURLWithPath: documentsDirectory)
let fileURL = pathURL.appendingPathComponent("\(fixture.id).pdf")
let httpsReference = FIRStorage.storage().reference(forURL: fixture.onlineManual)
print("zzz urlManual: \(fixture.onlineManual)")
let downloadTask = httpsReference.write(toFile: fileURL) {(URL, error) in
if error != nil {
print("downloadError with pdf")
print(error?.localizedDescription)
} else {
print("zzz donwload successful: \(URL!)")
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let context = appDelegate.persistentContainer.viewContext
let newManual = NSEntityDescription.insertNewObject(forEntityName: "OfflineManuals", into: context)
newManual.setValue(self.fixture.id, forKey: "id")
newManual.setValue("\(URL!)", forKey: "manual")
do {
try context.save()
print("zzz manual saved to device")
} catch {
print("zzz error saving manual to core data")
}
}
}
}
}
this is the code that loads the file from the device and displays it in a WKWebView
func loadRequest() {
let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
if documentsPath.count > 0 {
let documentsDirectory = documentsPath[0]
let restorePath = documentsDirectory + "/\(manualURL!).pdf"
let url = URL(fileURLWithPath: restorePath)
print("zzz url for local file: \(url)")
let req = URLRequest(url: url)
webView.load(req)
}
}
thank you for reading!

Answer 1

I finally found a way to do this. I still have no clou why my code in the question does not work on real devices but this one does and since i found a lot of people with similar problems desperatly looking for an answer use this:
SWIFT3 XCODE 8 IOS 10
import UIKit
import WebKit
class ViewController: UIViewController {
#IBOutlet weak var myView: UIView!
var webView: WKWebView!
let sema = DispatchSemaphore( value: 0 )
override func viewDidLoad() {
super.viewDidLoad()
webView = WKWebView()
myView.addSubview(webView)
savePDFtoDevice()
loadPDF()
}
the LayoutSubviews is not needed but i had problems without it...
override func viewDidLayoutSubviews() {
print("zzz width: \(self.myView.frame.size.width), height: \(myView.frame.size.height)")
print("zzz width screen: \(self.view.frame.width)")
let frame = CGRect(x: 30.0, y: 30.0, width: (self.myView.frame.width - 60), height: 300)
webView.frame = frame
}
func savePDFtoDevice(){
let myURL = URL(string: "http://www.claypaky.it/media/documents/HR_Mythos_Manual_05.2016_EN.pdf")
let req = URLRequest(url: myURL!)
let session = URLSession(configuration: .default)
session.dataTask(with: req) { (data, response, error) in
if error != nil {
print("zzz error got no session")
} else {
if let pdfData = data {
var url = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
url = url.appendingPathComponent("file.pdf")
print("zzz url to save: \(url)")
print("zzz got data: \(pdfData.description)")
try? data?.write(to: url)
print("zzz wrote to file")
self.sema.signal()
}
}
}.resume()
sema.wait()
}
func loadPDF() {
let url = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
print("zzz url to load from: \(url)")
do {
let content = try FileManager.default.contentsOfDirectory(at: url, includingPropertiesForKeys: nil, options: .skipsHiddenFiles)[0]
print("zzz file: \(content)")
webView.loadFileURL(content, allowingReadAccessTo: content)
print("zzz webView loaded")
} catch {
print("zzz error with getting the contents...")
}
}
}
I tried it in my app with changing URLs and filenames etc. and it does the trick.
Finally!!!!