(Swift 3,4,5...) Move Selected Emails to another Mailbox Folder

Downloads emails one by one in a selected mailbox, decides which emails are to be moved, and then moves the set of messages to another mailbox folder.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let imap = CkoImap()!

    // Connect to an IMAP server.
    // Use TLS
    imap.ssl = true
    imap.port = 993
    var success: Bool = imap.connect("imap.someMailServer.com")
    if success != true {
        print("\(imap.lastErrorText!)")
        return
    }

    // Login
    success = imap.login("myLogin", password: "myPassword")
    if success != true {
        print("\(imap.lastErrorText!)")
        return
    }

    // Select an IMAP mailbox
    success = imap.selectMailbox("Inbox")
    if success != true {
        print("\(imap.lastErrorText!)")
        return
    }

    // Normally, when an email is downloaded, its "Seen" flag is automatically set.
    // We don't want our program to be interfering with the "Seen" flags.
    // To do this, set the PeekMode to true.
    imap.peekMode = true

    // After selecting the mailbox, the NumMessages property
    // will contain the number of emails in the mailbox.
    // When sequence numbers (not UIDs) are used to reference emails,
    // they range from 1 to N, where N is the number of messages in the mailbox.
    // This example will download the headers by sequence numbers.
    var numEmails: Int = imap.numMessages.intValue

    let mset = CkoMessageSet()!

    // Indicate that mset contains sequence numbers, not UIDs.
    mset.hasUids = false

    // Fetch each email and decide for each if it is to be moved
    // to a particular other mailbox.  If so, we'll add the sequence number to
    // the mset, and then move all emails in the mset to the other mailbox.
    var i: Int = 0
    while i < numEmails {
        // Fetch the email by sequence number.
        var email: CkoEmail? = imap.fetchSingle(i + 1, bUid: false)
        if imap.lastMethodSuccess != true {
            print("\(imap.lastErrorText!)")
            return
        }

        // If it is decided to move the email, add the sequence number to mset, like this:
        mset.insertId(i + 1)

        email = nil
    }

    // If there are emails in mset to be moved, then do it..
    if mset.count.intValue > 0 {
        var destFolder: String? = "Inbox/SomeOtherFolder"
        // Assuming your IMAP server supports the feature that allows for messages to be moved to another folder...
        success = imap.move(mset, destFolder: destFolder)
        if success != true {
            print("\(imap.lastErrorText!)")
            return
        }

    }

    // Disconnect from the IMAP server.
    success = imap.disconnect()

}