SwiftData Error NSFileManager - ios

Question

I'm updating SwiftData from Swift 1.2 to Swift 2 and after some changes and corrections I'm still having an error that I can't understand why it's happening.
The code goes as the following:
public static func saveUIImage(image: UIImage) -> String? {
let docsPath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] as String
let imageDirPath = docsPath.stringByAppendingPathComponent("SwiftDataImages")
if !NSFileManager.defaultManager().fileExistsAtPath(imageDirPath) {
do {
try NSFileManager.defaultManager().createDirectoryAtPath(imageDirPath, withIntermediateDirectories: false, attributes: [:])
} catch {
print("Error creating SwiftData image folder")
return nil
}
}
let imageID = NSUUID().UUIDString
let imagePath = (imageDirPath as NSString).stringByAppendingPathComponent(imageID)
let imageAsData = UIImagePNGRepresentation(image)
if !imageAsData!.writeToFile(imagePath, atomically: true) {
print("Error saving image")
return nil
}
return imageID
}
On the 'do {' line Xcode is throwing the following error:
Cannot invoke 'createDirectoryAtPath' with an argument list of type '(String, withIntermediateDirectories: Bool, attributes: _, error: _)'
Any tips of why this is happening? It's driving me crazy.
Kind regards, and thanks in advance.
;)

Answer 1

In my Xcode 7.2 there is no:
let imageDirPath = docsPath.stringByAppendingPathComponent("SwiftDataImages")
So I tried this code and it compiles fine:
public func saveUIImage(image: UIImage) -> String? {
let docsPath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] as String
let imageDirPath = NSURL(string: docsPath)?.URLByAppendingPathComponent("SwiftDataImages")
if !NSFileManager.defaultManager().fileExistsAtPath(imageDirPath!.absoluteString) {
do {
try NSFileManager.defaultManager().createDirectoryAtPath(imageDirPath!.absoluteString, withIntermediateDirectories: false, attributes: [:])
} catch {
print("Error creating SwiftData image folder")
return nil
}
}
let imageID = NSUUID().UUIDString
let imagePath = (imageDirPath!.absoluteString as NSString).stringByAppendingPathComponent(imageID)
let imageAsData = UIImagePNGRepresentation(image)
if !imageAsData!.writeToFile(imagePath, atomically: true) {
print("Error saving image")
return nil
}
return imageID
}

Answer 2

Apple highly recommends to use the URL related API of NSFileManager and NSData
public func saveUIImage(image: UIImage) -> String? {
let fileManager = NSFileManager.defaultManager()
let docsURL = try! fileManager.URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: false)
let imageDirURL = docsURL.URLByAppendingPathComponent("SwiftDataImages")
if !fileManager.fileExistsAtPath(imageDirURL.path!) {
do {
try fileManager.createDirectoryAtURL(imageDirURL, withIntermediateDirectories: false, attributes:nil)
} catch let error as NSError{
print("Error creating SwiftData image folder", error)
return nil
}
}
let imageID = NSUUID().UUIDString
let imageURL = imageDirURL.URLByAppendingPathComponent(imageID)
let imageAsData = UIImagePNGRepresentation(image)
if !imageAsData!.writeToURL(imageURL, atomically: true) {
print("Error saving image")
return nil
}
return imageID
}