(Swift 3,4,5...) AddAttribute - Insert New Attribute in an XML Node

Demonstrates adding an name=value attribute to an XML element.

This example uses the XML sample file here: sample1.xml. The sample1.xml file contains this content:

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func chilkatTest() {
    let xml = CkoXml()!

    var success: Bool = xml.loadFile("qa_data/xml/sample1.xml")
    if success != true {
        print("\(xml.lastErrorText!)")
        return
    }

    // Navigate to the "books" element:
    var bFound: Bool = xml.findChild2("books")
    if bFound == false {
        print("No books child found!")
        return
    }

    var numChildren: Int = xml.numChildren.intValue

    var i: Int = 0
    while i < numChildren {

        // Navigate to the Nth book 
        xml.getChild2(i)

        // Display the book title:
        print("\(xml.getAttrValue("title")!)")

        // Add a new integer attribute:
        // Should never fail..
        xml.addAttributeInt("bookId", value: i)

        // Add a new unread="yes" attribute:
        xml.addAttribute("unread", value: "yes")

        // Navigate back up to the parent:
        xml.getParent2()

        i = i + 1
    }

    // Navigate back to the document root:
    xml.getRoot2()

    // Save the updated document:
    success = xml.save("modified.xml")
    if success != true {
        print("\(xml.lastErrorText!)")
        return
    }

    print("\(xml.getXml()!)")

}