(Swift 3,4,5...) Create Apple Watch HTML (text/watch-html) Email

Demonstrates how to create an Apple Watch text/watch-html email.

Note: This example requires Chilkat v9.5.0.68 or greater.

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func chilkatTest() {
    // This example will produce an email such as:

    // 	MIME-Version: 1.0
    // 	Date: Fri, 02 Jun 2017 09:17:06 -0500
    // 	Message-ID: <E6F1F17104442EA09740322D3E2E78806C87FB80@CHILKAT13>
    // 	X-Priority: 3 (Normal)
    // 	Subject: Apple Watch Example
    // 	From: from@example.org
    // 	To: to@example.org
    // 	Content-Type: multipart/alternative; boundary="------------080904030200000307060803"
    // 
    // 	--------------080904030200000307060803
    // 	Content-Type: text/plain; charset=utf-8
    // 	Content-Transfer-Encoding: quoted-printable
    // 	Content-Disposition: inline
    // 
    // 	This is the plain text part.
    // 	--------------080904030200000307060803
    // 	Content-Type: text/watch-html; charset=utf-8
    // 	Content-Disposition: inline
    // 	Content-Transfer-Encoding: quoted-printable
    // 
    // 	<b>This is the Watch HTML part</b>
    // 	--------------080904030200000307060803
    // 	Content-Type: text/html; charset=utf-8
    // 	Content-Disposition: inline
    // 	Content-Transfer-Encoding: quoted-printable
    // 
    // 	<p>This is the standard HTML part</p>
    // 	--------------080904030200000307060803--

    // Create a new email instance to get the default auto-created fields.
    let email = CkoEmail()!
    email.body = "This is the plain text part."
    email.subject = "Apple Watch Example"
    email.from = "from@example.org"
    email.add(to: "", emailAddress: "to@example.org")

    print("\(email.getMime()!)")
    print("--")

    // This is the MIME so far:
    // (Chilkat automatically removes CKX-* headers when sending email.)

    // 	MIME-Version: 1.0
    // 	Date: Fri, 02 Jun 2017 09:17:06 -0500
    // 	Message-ID: <E6F1F17104442EA09740322D3E2E78806C87FB80@CHILKAT13>
    // 	Content-Type: text/plain; format=flowed
    // 	Content-Transfer-Encoding: 7bit
    // 	X-Priority: 3 (Normal)
    // 	Subject: Apple Watch Example
    // 	From: from@example.org
    // 	CKX-Bounce-Address: from@example.org
    // 	To: to@example.org
    // 
    // 	This is the plain text part.

    // We'll use the Chilkat MIME object to build it.
    // The MIME API provides more flexibility..
    let mime = CkoMime()!
    mime.load(email.getMime())

    // Convert this MIME to multipart/alternative.
    mime.convertToMultipartAlt()

    print("\(mime.getMime()!)")
    print("--")

    // We now have this MIME:

    // 	MIME-Version: 1.0
    // 	Date: Fri, 02 Jun 2017 09:17:06 -0500
    // 	Message-ID: <E6F1F17104442EA09740322D3E2E78806C87FB80@CHILKAT13>
    // 	X-Priority: 3 (Normal)
    // 	Subject: Apple Watch Example
    // 	From: from@example.org
    // 	CKX-Bounce-Address: from@example.org
    // 	To: to@example.org
    // 	Content-Type: multipart/alternative; boundary="------------080904030200000307060803"
    // 
    // 	--------------080904030200000307060803
    // 	Content-Type: text/plain; format=flowed
    // 	Content-Transfer-Encoding: 7bit
    // 
    // 	This is the plain text part.
    // 	--------------080904030200000307060803--

    // If we desire a particular charset, encoding, or disposition..
    var partPlainText: CkoMime? = mime.getPart(0)
    partPlainText.charset = "utf-8"
    partPlainText.disposition = "inline"
    partPlainText.encoding = "quoted-printable"
    partPlainText = nil

    // Create the text/watch-html MIME part and add it.
    let partWatchHtml = CkoMime()!
    partWatchHtml.contentType = "text/watch-html"
    partWatchHtml.charset = "utf-8"
    partWatchHtml.disposition = "inline"
    partWatchHtml.encoding = "quoted-printable"
    partWatchHtml.setBody("<b>This is the Watch HTML part</b>")
    mime.appendPart(partWatchHtml)

    print("\(mime.getMime()!)")
    print("--")

    // We now have this MIME:

    // 	MIME-Version: 1.0
    // 	Date: Fri, 02 Jun 2017 09:17:06 -0500
    // 	Message-ID: <E6F1F17104442EA09740322D3E2E78806C87FB80@CHILKAT13>
    // 	X-Priority: 3 (Normal)
    // 	Subject: Apple Watch Example
    // 	From: from@example.org
    // 	CKX-Bounce-Address: from@example.org
    // 	To: to@example.org
    // 	Content-Type: multipart/alternative; boundary="------------080904030200000307060803"
    // 
    // 	--------------080904030200000307060803
    // 	Content-Type: text/plain; charset=utf-8
    // 	Content-Transfer-Encoding: quoted-printable
    // 	Content-Disposition: inline
    // 
    // 	This is the plain text part.
    // 	--------------080904030200000307060803
    // 	Content-Type: text/watch-html; charset=utf-8
    // 	Content-Disposition: inline
    // 	Content-Transfer-Encoding: quoted-printable
    // 
    // 	<b>This is the Watch HTML part</b>
    // 	--------------080904030200000307060803--

    // Create the text/html MIME part and add it.
    let partHtml = CkoMime()!
    partHtml.contentType = "text/html"
    partHtml.charset = "utf-8"
    partHtml.disposition = "inline"
    partHtml.encoding = "quoted-printable"
    partHtml.setBody("<p>This is the standard HTML part</p>")
    mime.appendPart(partHtml)

    print("\(mime.getMime()!)")
    print("--")

    // We now have this MIME:

    // 	MIME-Version: 1.0
    // 	Date: Fri, 02 Jun 2017 09:17:06 -0500
    // 	Message-ID: <E6F1F17104442EA09740322D3E2E78806C87FB80@CHILKAT13>
    // 	X-Priority: 3 (Normal)
    // 	Subject: Apple Watch Example
    // 	From: from@example.org
    // 	CKX-Bounce-Address: from@example.org
    // 	To: to@example.org
    // 	Content-Type: multipart/alternative; boundary="------------080904030200000307060803"
    // 
    // 	--------------080904030200000307060803
    // 	Content-Type: text/plain; charset=utf-8
    // 	Content-Transfer-Encoding: quoted-printable
    // 	Content-Disposition: inline
    // 
    // 	This is the plain text part.
    // 	--------------080904030200000307060803
    // 	Content-Type: text/watch-html; charset=utf-8
    // 	Content-Disposition: inline
    // 	Content-Transfer-Encoding: quoted-printable
    // 
    // 	<b>This is the Watch HTML part</b>
    // 	--------------080904030200000307060803
    // 	Content-Type: text/html; charset=utf-8
    // 	Content-Disposition: inline
    // 	Content-Transfer-Encoding: quoted-printable
    // 
    // 	<p>This is the standard HTML part</p>
    // 	--------------080904030200000307060803--

    // Load the email object with this MIME, and we're good to go..
    email.setFromMimeText(mime.getMime())
    print("\(email.getMime()!)")

}