简单数字动画

你可能遇到的最基本的动画之一是 NumberAnimation。此动画通过将项目属性的数值从初始状态更改为最终状态来工作。考虑以下完整示例：

import QtQuick 2.7    
import QtQuick.Controls 2.0    

ApplicationWindow {
    visible: true
    width: 400
    height: 640

    Rectangle{
        id: rect
        anchors.centerIn: parent
        height: 100
        width: 100
        color: "blue"
        MouseArea{
            anchors.fill: parent
            onClicked: na.running = true
        }

        NumberAnimation {
            id: na    //ID of the QML Animation type  
            target: rect    //The target item on which the animation should run  
            property: "height"    //The property of the target item which should be changed by the animator to show effect  
            duration: 200    //The duration for which the animation should run  
            from: rect.height    //The initial numeric value of the property declared in 'property'
            to: 200    //The final numeric value of the property declared in 'property'
        }
    }
}