How to get the data from file on Icloud Swift - ios

Question

I'm creating an app that gets a file from Icloud and converts it into a b64 format string, but I have a problem:
I really don't know how to get the data from this file. I thought that could be easy opening the Path from the imported file from ICloud but It returns nil when I try to acess to the route.
My code example is here, as you can see I have the temp route :( (file:///.../Aplication/xxx-xxx-xxx-xx/temp/com.domain.AppName/Carolina.cer):
extension KeyViewController: UIDocumentMenuDelegate {
func documentMenu(documentMenu: UIDocumentMenuViewController, didPickDocumentPicker documentPicker: UIDocumentPickerViewController) {
documentPicker.delegate = self
print ("documentMenu")
self.presentViewController(documentPicker, animated: true, completion: nil)
}
}
extension KeyViewController: UIDocumentPickerDelegate {
func documentPicker(controller: UIDocumentPickerViewController, didPickDocumentAtURL url: NSURL) {
print("url string")
print(String(url))
//prints file:///.../Aplication/xxx-xxx-xxx-xx/temp/com.domain.AppName/Carolina.cer
if controller.documentPickerMode == UIDocumentPickerMode.Import {
if (NSFileManager.defaultManager().fileExistsAtPath(String(url))){
print("exists")
}
else{
print("not exists")
}
dispatch_async(dispatch_get_main_queue()) {
if let fileName = url.lastPathComponent {
var fileNameArray = fileName.componentsSeparatedByString(".")
print ("fileNameArray")
print (fileNameArray)
if ((fileNameArray[1] != "cer") && (fileNameArray[1] != "key")) {
self.alertMessage = "Not a valid selection, choose .cer or .key Files"
self.showAlertMessage(self.alertMessage)
}
else{
//saving the name
if (fileNameArray[1]=="cer")
{
NSUserDefaults.standardUserDefaults().setObject(fileName, forKey: "temporalCerFile")
}
else{
//saving the name
NSUserDefaults.standardUserDefaults().setObject(fileName, forKey: "temporalKeyFile")
}
NSUserDefaults.standardUserDefaults().synchronize()
}
}
}
}
}
}
How can I get the content inside the file?. Please, hope you can help me

Answer 1

Your code isn't working because you are passing the incorrect value to fileExistsAtPath:.
The proper way to convert a file NSURL to a file string is to use the path() method.
if (NSFileManager.defaultManager().fileExistsAtPath(url.path())) {
It might be url.path instead of url.path(). I'm not sure about the older Swift syntax. In Swift 3 it would be:
if FileManager.default.fileExists(atPath: url.path) {
Once you know it exists, that are many ways to load the file. It all depends on what you need to do with it. But the first requirement is to move the file from the given url to a location inside your app's sandbox. At least if you need the file to survive the next use of your app. If you just need to look at the file this one time, you don't need this step.