问题现象
在应用中，每个接口都可能返回响应码Code，需要在接口拦截器中实现一个全局弹窗。由于接口是并发的，弹窗只能弹出一次。那么如何实现这个全局弹窗呢？此外，由于弹窗可能会在多个页面弹出（如启动页、登录页、主页等），这些页面可能会被销毁，这会导致弹窗无法正常显示。
效果预览
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背景知识
使用弹窗组件时，可优先考虑自定义弹窗，便于自定义弹窗的样式与内容。通过CustomDialogController类显示自定义弹窗，不支持直接在类中定义和使用。通常需要将弹框逻辑封装成Builder或其他组件，以便在需要时调用。
可以使用@StorageLink与AppStorage中的key对应的属性建立双向数据同步，该属性可以和UI组件同步，且可以在应用业务逻辑中被访问。
解决方案
在并发接口拦截器中，由于弹窗弹出位置不确定且仅弹出一次，因此需要维护一个全局变量来保证弹窗的弹出状态。可以在AppStorage中定义弹窗弹出状态，并通过@StorageLink来获取弹窗是否曾弹出，具体实现可参考以下示例：
EntryAbility.ets的onWindowStageCreate方法里通过AppStorage定义关于弹框显示的全局属性，默认false不显示：
windowStage.loadContent('pages/Index', (err) => {
AppStorage.setOrCreate('showGlobalCustomDialog', false);
if (err.code) {
hilog.error(DOMAIN, 'testTag', 'Failed to load the content. Cause: %{public}s', JSON.stringify(err));
return;
}
hilog.info(DOMAIN, 'testTag', 'Succeeded in loading the content.');
});
封装1个弹框实例类CustomDialogLayout.ets：
@CustomDialog
export struct CustomDialogLayout {
controller?: CustomDialogController;
build() {
Column() {
Text('Global Custom Dialog Test');
}
.justifyContent(FlexAlign.Center)
.alignItems(HorizontalAlign.Center)
.height(400);
}
}
Index.ets，在该页面import并创建实例import { CustomDialogLayout } from './CustomDialogLayout'，并且监听showGlobalCustomDialog属性值的改变并进行拉起弹窗动作：
import { CustomDialogLayout } from './CustomDialogLayout';
@Entry
@Component
struct Index {
@Provide('pathStack') pathStack: NavPathStack = new NavPathStack();
@StorageLink('showGlobalCustomDialog') @Watch('globalCustomDialogStateChange') showGlobalCustomDialog: boolean = false;
globalCustomDialogStateChange() {
if (this.showGlobalCustomDialog) {
if (this.dialogController != null) {
this.dialogController.open();
AppStorage.setOrCreate('showGlobalCustomDialog', false);
}
}
}
dialogController: CustomDialogController | null = new CustomDialogController({
builder: CustomDialogLayout({}),
autoCancel: true,
alignment: DialogAlignment.Center,
});
build() {
Navigation(this.pathStack) {
RelativeContainer() {
Button('跳转其他页面')
.fontSize(15)
.fontWeight(FontWeight.Bold)
.alignRules({
center: { anchor: 'container', align: VerticalAlign.Center },
middle: { anchor: 'container', align: HorizontalAlign.Center }
})
.onClick(() => {
this.pathStack.pushPathByName('DetailPage', null);
});
}
.height('100%')
.width('100%');
}
.mode(NavigationMode.Stack); }
}
DetailPage.ets，在该页面设置showGlobalCustomDialog全局属性为true即可调起弹框：
@Builder
export function DetailPageBuilder() {
DetailPage();
}
@Component
export struct DetailPage {
@Consume('pathStack') pathStack: NavPathStack;
build() {
NavDestination() {
RelativeContainer() {
Button('promptAction弹窗')
.onClick(() => {
AppStorage.setOrCreate('showGlobalCustomDialog', true);
})
.alignRules({
center: { anchor: 'container', align: VerticalAlign.Center },
middle: { anchor: 'container', align: HorizontalAlign.Center }
});
};
}.title('DetailPage');
}
}
总结
在并发场景下，为了实现条件判断和控制弹窗弹出的行为，可以通过在AppStorage中维护一个全局变量，并使用@StorageLink进行同步监听。这种方法可以保证弹窗只弹出一次，从而避免重复弹出问题。
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