iCloud drive project setup

1. In capabilities need to turn on the iCloud and tick the iCloud Documnet in services. Choose the container and note 
down its name. (because while setting up settings inside info.plist we. need to set the NSUbiquitousContainers key value
same as this name).

2. We need to define the iCloud Drive Container that we are going to use inside info.plist

<key>NSUbiquitousContainers</key>
<dict>
    <key>this has to be same as selected containers name inside entitlement</key>
    <dict>
        <key>NSUbiquitousContainerIsDocumentScopePublic</key>
        <true/>
        <key>NSUbiquitousContainerName</key>
        <string>Teszt</string>
        <key>NSUbiquitousContainerSupportedFolderLevels</key>
        <string>Any</string>
    </dict>
</dict>

3. Need the url of the iCloud Container

var containerUrl: URL? {
//  forUbiquityContainerIdentifier : Returns the URL for the iCloud container associated with the specified identifier 
//  and establishes access to that container.
    return FileManager.default.url(forUbiquityContainerIdentifier: nil)?.appendingPathComponent("Documents")
}
// check for container existence
if let url = self.containerUrl, !FileManager.default.fileExists(atPath: url.path, isDirectory: nil) {
    do {
        try FileManager.default.createDirectory(at: url, withIntermediateDirectories: true, attributes: nil)
    }
    catch {
        print(error.localizedDescription)
    }
}

4. Copying to iCloud

func DownloadDocumnt() {
    print("Selected URL: \(self.SelectedDownloadURL)")
    let fileURL = URL(string: "\(self.SelectedDownloadURL)")!

    let documentsUrl:URL =  FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
    let destinationFileUrl = documentsUrl.appendingPathComponent("Libra-asasas")

    do {
        if(FileManager.default.fileExists(atPath: destinationFileUrl.path)) {
            try FileManager.default.removeItem(at: destinationFileUrl)
            try FileManager.default.copyItem(at: tempLocalUrl, to: destinationFileUrl)
        } else {
            try FileManager.default.copyItem(at: tempLocalUrl, to: destinationFileUrl)
        }

        if let iCloudDocumentsURL = FileManager.default.url(forUbiquityContainerIdentifier: nil)?.appendingPathComponent("Documents") {
            if(!FileManager.default.fileExists(atPath: iCloudDocumentsURL.path, isDirectory: nil)) {
                try FileManager.default.createDirectory(at: iCloudDocumentsURL, withIntermediateDirectories: true, attributes: nil)
            }
        }

        let iCloudDocumentsURL = FileManager.default.url(forUbiquityContainerIdentifier: nil)?.appendingPathComponent("Documents").appendingPathComponent("Libra-asasas")

        if let iCloudDocumentsURL = iCloudDocumentsURL {
            var isDir:ObjCBool = false
            if(FileManager.default.fileExists(atPath: iCloudDocumentsURL.path, isDirectory: &isDir)) {
                try FileManager.default.removeItem(at: iCloudDocumentsURL)
                try FileManager.default.copyItem(at: tempLocalUrl, to: iCloudDocumentsURL)
            } else {
                try FileManager.default.copyItem(at: destinationFileUrl, to: iCloudDocumentsURL)
            }
        }
    } catch {
        print("Error : \(error.localizedDescription)")
    }
}