Animated text in QML

alt.qml

import QtQuick 2.0

/*!
  An alternative implementation,
  this one causes a binding loop for some reason.
*/
Rectangle {
    width: 500
    height: 300

    Text {
        id: printer

        property int index
        property bool isTag
        property string sourceText: "This is my special string."
        property string destinationText: ""

        text: sourceText.slice(0, ++index)

        NumberAnimation on index {
            to: printer.sourceText.length
            duration: 1000
        }
    }
}

main.qml

import QtQuick 2.0

/*!
  This example illustrates how to animate text
  using a Timer and some JavaScript.
*/
Rectangle {
    width: 500
    height: 300

    Text {
        id: printer

        property int i
        property bool isTag
        property string sourceText: "This is my special string."

        function type() {
            text = sourceText.slice(0, ++i);
            if (text === sourceText) return timer.stop()
            
            printer.text = text;
        }

        Timer {
            id: timer
            interval: 100
            repeat: true
            running: true

            onTriggered: printer.type()
            onRunningChanged: running === false ? print("Stopped.") : null
        }
    }
}

Thank you dude, it worked for me :)