鸿蒙应用开发 | 曝光一个使用鸿蒙系统开发的知乎登录界面

上一篇原创文章解读了鸿蒙应用开发 | 按钮（Button）组件的功能与用法。
老规矩看完练习一下，不联系理解不到位。

今天不讲新东西，把之前学习的东西总结一下，实战一下，今天来开发一个知乎的登录界面。

下面我们开始今天的文章，还是老规矩，通过如下几点来说：

用到的组件

看看上面的效果。一个完整的登录界面，后面会根据学习的组件，完成一个app项目的开发。
登录界面用到了线性布局：DirectionalLayout

用到的组件：
1，Text ，文本信息展示
2，TextField，信息输入框
3，Button，按钮
4，Image，图片展示
里面的基本都学习了功能和使用，只有Image没有介绍过，这个后面即将详细讲解。

代码讲解

一切准备就绪，开始我们的今天实战。

我们先来创建一个项目，开始今天的开发。不知道入门的去看第一篇文章，鸿蒙开发入门。

鸿蒙应用开发 | 曝光一个使用鸿蒙系统开发的知乎登录界面

直接上代码：

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

    <DirectionalLayout
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:padding="10vp"
        ohos:orientation="horizontal">

        <Text
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:layout_alignment="horizontal_center"
            ohos:text_color="#666666"
            ohos:text="X"
            ohos:text_size="20vp"
            />

        <Text
            ohos:height="match_content"
            ohos:width="match_parent"
            ohos:background_element="$graphic:background_ability_main"
            ohos:layout_alignment="horizontal_center"
            ohos:text_alignment="right"
            ohos:text_color="#333333"
            ohos:text="免密码登录"
            ohos:text_size="20vp"
            />

    </DirectionalLayout>


    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:top_margin="50vp"
        ohos:layout_alignment="horizontal_center"
        ohos:text_alignment="center"
        ohos:text_color="#333333"
        ohos:text="密码登录"
        ohos:text_size="25vp"
        />

    <DirectionalLayout
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:top_margin="30vp"
        ohos:left_margin="20vp"
        ohos:right_margin="20vp"
        ohos:orientation="vertical">

        <TextField
            ohos:id="$+id:input_phone"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:padding="5vp"
            ohos:text_color="#666666"
            ohos:hint="输入手机号或邮箱"
            ohos:text_size="20vp"
            />

        <Text
            ohos:height="1vp"
            ohos:width="match_parent"
            ohos:background_element="#999999"
            />

    </DirectionalLayout>

    <DirectionalLayout
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:top_margin="20vp"
        ohos:left_margin="20vp"
        ohos:right_margin="20vp"
        ohos:orientation="vertical">

        <TextField
            ohos:id="$+id:input_password"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:padding="5vp"
            ohos:text_color="#666666"
            ohos:hint="输入密码"
            ohos:text_size="20vp"
            />

        <Text
            ohos:height="1vp"
            ohos:width="match_parent"
            ohos:background_element="#999999"
            />

    </DirectionalLayout>

    <Button
        ohos:id="$+id:login"
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:left_margin="20vp"
        ohos:right_margin="20vp"
        ohos:top_margin="20vp"
        ohos:background_element="#3399ff"
        ohos:padding="10vp"
        ohos:text_color="#ffffff"
        ohos:text="登录"
        ohos:text_size="20vp"
        />

    <DirectionalLayout
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:left_margin="20vp"
        ohos:right_margin="20vp"
        ohos:top_margin="10vp"
        ohos:orientation="horizontal">

        <Text
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:layout_alignment="horizontal_center"
            ohos:text_color="#333333"
            ohos:text="海外手机号登录"
            ohos:text_size="18vp"
            />

        <Text
            ohos:height="match_content"
            ohos:width="match_parent"
            ohos:background_element="$graphic:background_ability_main"
            ohos:layout_alignment="horizontal_center"
            ohos:text_alignment="right"
            ohos:text_color="#333333"
            ohos:text="需要帮助"
            ohos:text_size="18vp"
            />

    </DirectionalLayout>

    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:weight="1"
        />

    <DirectionalLayout
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:layout_alignment="center"
        ohos:orientation="horizontal">

        <Image
            ohos:height="60vp"
            ohos:width="60vp"
            ohos:image_src="$media:bzo"
            />

        <Image
            ohos:height="60vp"
            ohos:width="60vp"
            ohos:image_src="$media:bzq"
            />

    </DirectionalLayout>

    <DirectionalLayout
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:bottom_margin="20vp"
        ohos:layout_alignment="center"
        ohos:alignment="center"
        ohos:orientation="horizontal">

        <Text
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:layout_alignment="horizontal_center"
            ohos:text_color="#999999"
            ohos:text="注册即代表你同意"
            ohos:text_size="15vp"
            />

        <Text
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_ability_main"
            ohos:layout_alignment="horizontal_center"
            ohos:text_color="#3333ff"
            ohos:text="《知乎协议》"
            ohos:text_size="15vp"
            />
        <Text
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_ability_main"
            ohos:layout_alignment="horizontal_center"
            ohos:text_color="#999999"
            ohos:text="和"
            ohos:text_size="15vp"
            />
        <Text
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_ability_main"
            ohos:layout_alignment="horizontal_center"
            ohos:text_color="#3333ff"
            ohos:text="《隐私保护指引》"
            ohos:text_size="15vp"
            />

    </DirectionalLayout>

</DirectionalLayout>

鸿蒙应用开发 | 曝光一个使用鸿蒙系统开发的知乎登录界面

讲解：
1，布局用到了DirectionalLayout 线性自上到下布局，属性用到了ohos:orientation="vertical" 竖直属性效果。
2，最顶部的 ”免登录密码“ 用到了属性 ohos:text_alignment="right" 位置居右。
3，TextField 组件用到了属性 ohos:hint="输入密码" ，显示默认提示信息。
4，Image 组件我们第一次使用，属性使用到了 ohos:image_src="$media:bzo" ，设置图片资源。

还有其它问题开源留言或者联系我。