Write Image To File in Directory - ios

Question

I am getting an error when writing an image file to a directory in Xcode. The function data.writeToFile is returning an error. Here is what I am trying to do:
Get The File Path:
func getPath(fileName: String) -> String {
let documentURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]
let folder = "sampleDirectory"
return documentURL.URLByAppendingPathComponent(folder).URLByAppendingPathComponent(fileName).path!
}
Save the Image
func saveImage(image: UIImage, path: String) -> Bool {
let pngImageData = UIImagePNGRepresentation(image)
do {
let success = try pngImageData?.writeToFile(path, options: NSDataWritingOptions.init(rawValue: 0))
} catch {
print(error)
}
return false
}
However, there is an error saying:
NSPOSIXErrorDomain - code : 2
Does anyone know what the problem could be?
EDIT
Where I call the code:
let fileName = "first_image"
let imagePath = self.getPath(fileName)
let result = self.saveImage(processedImage, path: imagePath)
processedImage is of type UIImage!

Answer 1

Try creating the directory "sampleDirectory" if it does not exists or don't use a subdirectory.
You can check if the directory exists with:
if !NSFileManager.defaultManager().fileExistsAtPath(path) {
// create missing directories
try! NSFileManager.defaultManager().createDirectoryAtPath(foo, withIntermediateDirectories: true, attributes: nil)
}
You also might want to use the option NSDataWritingOptions.DataWritingAtomic which first write to an auxiliary file first and then exchange the files if there were no errors