I'm not sure what you're asking, but the answer to what I think you're asking is that views change by way of bindings. They can also be changed directly/procedurally, but I'll give an example of a binding.

(Think of an Item as a visual component, which can either be referred to by an id or, as I've done here, referred to by its children as "parent".)

    Item {
        property int count: 1

        Button {
            height: 30; width: 80
            onClicked: parent.count++
        }

        Text {
            height: 20; width: 30
            text: parent.count
        }
    }

The text will update every time you click the button.