SWIFT : Prevent backup files on iCloud

Question

How do I prevent iCloud backup in my app. For that I tried with NSFileManager. And How to implement addSkipBackupAttributeToItemAtURL in Swift?

I tried with this stuff

extension NSFileManager{
    func addSkipBackupAttributeToItemAtURL(url:NSURL)->Bool{
        var error:NSError?
        let success:Bool = url.setResourceValue(NSNumber.numberWithBool(true), forKey: NSURLIsExcludedFromBackupKey, error: &error);
        return success;
    }
}

But it gives me error : Extra argument error in call

Now for calling the above function...

NSFileManager.defaultManager().addSkipBackupAttributeToItemAtURL(NSURL.fileURLWithPath());

Answer 1

Your code looks like Swift 1.x syntax. Assuming you're using Swift 2.x, you need to use the native Swift error-handling syntax. Like this:

extension NSFileManager{
    func addSkipBackupAttributeToItemAtURL(url:NSURL) throws {
        try url.setResourceValue(true, forKey: NSURLIsExcludedFromBackupKey)
    }
}

At the callsite, you need to handle the error like this:

do {
    let url = ... // the URL of the file
    try NSFileManager.defaultManager().addSkipBackupAttributeToItemAtURL(url)
} catch {
    // Handle error here
    print("Error: \(error)")
}