零基础学鸿蒙编程-UI控件_StackLayout 原创

蓝不蓝编程

发布于 2021-11-29 22:41

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什么是StackLayout

StackLayout又称层叠布局,其定位方式非常简单,所有控件都默认定位左上角.也支持将子控件显示在父控件的上下左右及正中间.

基础样例

1. 默认定位样例

效果图

零基础学鸿蒙编程-UI控件_StackLayout-鸿蒙开发者社区

代码

<?xml version="1.0" encoding="utf-8"?>
<StackLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent">

    <Image
        ohos:height="match_parent"
        ohos:width="match_parent"
        ohos:image_src="$media:beauty"/>

    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:background_element="#000000"
        ohos:layout_alignment="center"
        ohos:text="花生皮编程"
        ohos:text_color="#ffffff"
        ohos:text_size="20fp"
        ohos:top_margin="50vp"/>
</StackLayout>

2. 相对父控件定位

效果图

零基础学鸿蒙编程-UI控件_StackLayout-鸿蒙开发者社区

代码

<?xml version="1.0" encoding="utf-8"?>
<StackLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:background_element="$media:beauty">

    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:background_element="#000000"
        ohos:layout_alignment="left"
        ohos:text="左上"
        ohos:text_color="#ffffff"
        ohos:text_size="20fp"/>

    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:background_element="#000000"
        ohos:layout_alignment="right"
        ohos:text="右上"
        ohos:text_color="#ffffff"
        ohos:text_size="20fp"/>

    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:background_element="#000000"
        ohos:layout_alignment="center"
        ohos:text="正中间"
        ohos:text_color="#ffffff"
        ohos:text_size="20fp"/>

    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:background_element="#000000"
        ohos:layout_alignment="left|bottom"
        ohos:text="左下"
        ohos:text_color="#ffffff"
        ohos:text_size="20fp"/>

    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:background_element="#000000"
        ohos:layout_alignment="right|bottom"
        ohos:text="右下"
        ohos:text_color="#ffffff"
        ohos:text_size="20fp"/>
</StackLayout>

完整源代码

https://gitee.com/hspbc/harmonyos_demos/tree/master/stackLayoutDemo

常用属性说明

属性名	用途
ohos:width	设置控件宽度,可设置为:match_parent(和父控件一样),match_content(按照内容自动伸缩),设置固定值(如200vp)
ohos:height	设置控件高度,可设置为:match_parent(和父控件一样),match_content(按照内容自动伸缩),设置固定值(如200vp)
ohos:layout_alignment	在父控件内对齐方式,可选值：left：居左；start：居左；center：居中；right：居右；end：居右；top：居上；bottom：居下；horizontal_center：水平居中；vertical_center：垂直居中
ohos:background_element	设置背景,可以是色值(如#FF0000)或图片等
ohos:visibility	可选值: visible(显示), invisible(隐藏,但是仍占据UI空间),hide(隐藏,且不占UI空间)