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12_组件-任意组件
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powerhope
August 11, 2016
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12_组件-任意组件
App Inventor移动应用开发
powerhope
August 11, 2016
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Transcript
College of Mathematics and Computer Science, Hunan Normal University 瞿绍军
湖南师范大学数学与计算机科学学院
College of Mathematics and Computer Science, Hunan Normal University
任意组件是用App Inventor进行高级编程的一项非 常重要的功能,可以实现对某个组件属性的动态修 改,或成批的修改多个组件的属性。在任意组件的 块中都增加了一个“组件”参数,用来指定需要修改 属性的组件对象或获取组件对象的对应属性值 任意组件
College of Mathematics and Computer Science, Hunan Normal University
在组件设计窗口的组件列表中是没有任意组件显示 的,因为任意组件不是一个真正的组件。当添加了 某个组件到组件设计视图中后,在逻辑设计的模块 下面的任意组件下才会出现该类组件的任意组件。 如下图是添加了按钮和标签后出现的任意按钮和任 意标签。 任意组件
College of Mathematics and Computer Science, Hunan Normal University 成批修改标签文本颜色和大小
College of Mathematics and Computer Science, Hunan Normal University 成批修改标签文本颜色和大小
College of Mathematics and Computer Science, Hunan Normal University 成批修改标签文本颜色和大小
College of Mathematics and Computer Science, Hunan Normal University
这里的实现中是直接在逐项循环中创建的列表,然 后把四个标签组件对象放到列表中的。 成批修改标签文本颜色和大小
College of Mathematics and Computer Science, Hunan Normal University
此外,也可以先创建一个全局变量,并初始化为空 列表,然后在某个事件(如屏幕初始化事件)中通 过设置全局变量的值处创建列表并添加对象。但是 不能直接定义全局变量后就创建列表,因为此时组 件对象都还没有加载,如下图是不允许的。 成批修改标签文本颜色和大小
College of Mathematics and Computer Science, Hunan Normal University
正确的创建组件列表的方式 成批修改标签文本颜色和大小
College of Mathematics and Computer Science, Hunan Normal University 成批修改标签文本颜色和大小
College of Mathematics and Computer Science, Hunan Normal University 成批修改标签文本颜色和大小