Can not save file inside tmp directory

by

absoluteString is not the correct method to get a file path of
an NSURL, use path instead:

let targetPath = tempDirectoryURL.URLByAppendingPathComponent("\(name).jpg").path!
data.writeToFile(targetPath, atomically: true)

Or better, work with URLs only:

let targetURL = tempDirectoryURL.URLByAppendingPathComponent("\(name).jpg")
data.writeToURL(targetURL, atomically: true)

Even better, use writeToURL(url: options) throws
and check for success or failure:

do {
    try data.writeToURL(targetURL, options: [])
} catch let error as NSError {
    print("Could not write file", error.localizedDescription)
}

Swift 3/4 update:

let targetURL = tempDirectoryURL.appendingPathComponent("\(name).jpg")
do {
    try data.write(to: targetURL)
} catch {
    print("Could not write file", error.localizedDescription)
}

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