iOS: Do not back up attribute?

Question

Our app has recently been rejected for violating iOS Data Storage Guidelines about backing up files on iCloud.

I must mark data with the do not ba

Answer 1

Swift 5 version:

func addSkipBackupAttributeTo(url constURL: URL) {
    do {
        // Need a mutable URL to call setResourceValues
        var url = constURL
        var resourceValues = URLResourceValues()
        resourceValues.isExcludedFromBackup = true
        try url.setResourceValues(resourceValues)
    } catch {
        print("Unable to set isExcludedFromBackup on \(constURL)")
    }
}

URLResourceValues keeps track of which values are modified and only writes those out, so it's fine to initialize a new object, set one key and call setResourceValues with it.