问题现象
当CustomDialog内部嵌套Navigation容器时，弹窗设置底部显示alignment: DialogAlignment.Bottom时失效，问题代码如下：
@CustomDialog
export struct MyDialog {
controller: CustomDialogController;
build() {
Navigation() {
Column() {
Text('我是弹窗')
.margin({ top: 20 });
}
.width('100%')
.height(200)
.backgroundColor(Color.White);
};
}
}
@Entry
@Component
struct Dialog {
myDiaController: CustomDialogController = new CustomDialogController({
builder: MyDialog({}),
customStyle: true, // 弹窗容器样式是否自定义
autoCancel: false, // 是否允许点击遮障层退出
alignment: DialogAlignment.Bottom, // 弹窗在竖直方向上的对齐，底部对齐失效
});
onPageShow(): void {
this.myDiaController.open();
}
build() {
}
}
问题现象如下：
点击放大
背景知识
CustomDialog：是一种常见的自定义弹窗方式，当其内部嵌套Navigation容器时，Navigation容器在不设置高度的情况下会默认撑满屏幕，而Navigation内部默认至上而下显示，所以导致弹窗的底部显示命令在显示效果上没有生效。
解决方案
由于Navigation在不设置高度时，默认撑满整个手机屏幕，导致嵌套Navigation的弹窗也是全屏显示，从而导致DialogAlignment.Bottom从体验上未生效。实际逻辑是弹窗已经是全屏显示，弹窗底部对齐后依旧是全屏显示。
为Navigation容器设置高度限制（本示例设置300vp），并设置背景颜色为蓝色后，可以发现弹窗为底部对齐效果：
@CustomDialog
export struct MyDialog {
controller: CustomDialogController;
pathStack: NavPathStack = new NavPathStack();
build() {
// 弹窗内使用Navigation可实现弹窗内路由跳转，从而更换弹窗内显示的页面
Navigation(this.pathStack) {
Column() {
Text('我是弹窗')
.margin({ top: 20 });
}
.width('100%')
.height(200)
.backgroundColor(Color.White);
}
.height(300)
.backgroundColor('#0a59f7');
}
}
@Entry
@Component
struct DialogDemo {
myDialogController: CustomDialogController = new CustomDialogController({
builder: MyDialog({}),
customStyle: true, // 弹窗容器样式是否自定义
autoCancel: false, // 是否允许点击遮障层退出
alignment: DialogAlignment.Bottom, // 弹窗在竖直方向上的对齐，底部对齐失效
});
onPageShow(): void {
this.myDialogController.open();
}
build() {
}
}
实现效果如下：
点击放大
上图中弹窗为白色与蓝色部分（其中白色是弹窗中子组件背景色，蓝色是弹窗背景色），弹窗底部对齐。
总结
多数情况下，父容器的大小在未设置尺寸限制的情况下默认自适应子组件大小，所以，该思维惯性会陷入一个误区：默认Navigation容器未设置尺寸时会自适应其子组件Column的高度200vp，从而默认弹窗高度是200vp、底部对齐命令未生效。而实际上，部分容器在未设置尺寸限制时会默认全屏显示，例如Navigation、Tabs等。
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