河南手机网站设计,广东做网站公司,网站的关键词挖掘方式,礼品工艺品网站建设应用状态 应用状态相关的内容需要使用模拟器或真机调试#xff0c;在API 11开始也支持preview 1.LocalStorage LocalStorage是页面级的UI状态存储#xff0c;通过Entry装饰器接收参数可以在页面内共享数据 1.1 页面内共享数据
import {MyUser} from ../model/MyUser
//用户对…应用状态 应用状态相关的内容需要使用模拟器或真机调试在API 11开始也支持preview 1.LocalStorage LocalStorage是页面级的UI状态存储通过Entry装饰器接收参数可以在页面内共享数据 1.1 页面内共享数据
import {MyUser} from ../model/MyUser
//用户对象
let user:MyUser {name:jack,age:18}
//存储的对象
let para:Recordstring,MyUser {user:user}
//创建LocalStorage对象
const storage new LocalStorage(para);
Entry(storage) //需要将共享的对象放入到Entry中
Component
struct LocalStoragePage {//获取到key是user的对象LocalStorageProp(user) user:MyUser {}build() {Column({space:20}){Text(this.user.name ----- this.user.age)Divider()ChildA()Divider()ChildB()}}
}Component
struct ChildA {//获取到key是user的对象LocalStorageProp(user) user:MyUser {}build() {Column(){Text(ChildA--- this.user.name ----- this.user.age).onClick((){//断言this.user.age不为undefinedthis.user.age this.user.age as numberthis.user.age})}}
}Component
struct ChildB {//获取到key是user的对象LocalStorageProp(user) user:MyUser {}build() {Column(){Text(ChildB--- this.user.name ----- this.user.age).onClick((){//断言this.user.age不为undefinedthis.user.age this.user.age as numberthis.user.age})}}
}1.2 页面间共享数据 在UIAbility创建LocalStorage通过loadContent提供给加载的窗口 第一步 src/main/ets/entryability/EntryAbility.ets export class MyUser{name?:stringage?:number
}import { AbilityConstant, UIAbility, Want } from kit.AbilityKit;
import { hilog } from kit.PerformanceAnalysisKit;
import { window } from kit.ArkUI;
import {MyUser} from ../model/MyUserexport default class EntryAbility extends UIAbility {//用户对象user:MyUser {name:jack,age:18}//存储的对象para:Recordstring,MyUser {user:this.user}//创建LocalStorage对象storage:LocalStorage new LocalStorage(this.para)//注意windowStage.loadContent中要加载storagewindowStage.loadContent(pages/Index,this.storage, (err) {if (err.code) {hilog.error(0x0000, testTag, Failed to load the content. Cause: %{public}s, JSON.stringify(err) ?? );return;}hilog.info(0x0000, testTag, Succeeded in loading the content.);});}
} Index.ets import {MyUser} from ../model/MyUser
//获取LocalStorage对象
const storage LocalStorage.getShared()
Entry(storage)
Component
struct Index {//获取到key是user的对象LocalStorageProp(user) user:MyUser {}build() {Column(){Text(this.user.name ----- this.user.age)Text(JSON.stringify(this.user))}}
}2.AppStorage AppStorage是在应用启动的时候会被创建的单例。它的目的是为了提供应用状态数据的中心存储这些状态数据在应用级别都是可访问的。AppStorage将在应用运行过程保留其属性。属性通过唯一的键字符串值访问 2.1 通过UI装饰器使用 AppStroage 是应用全局的UI状态存储是和应用的进程绑定的由UI框架在应用程序创建的时候创建为应用程序UI状态属性提供了中央存储。 如果初始化使用AppStorage.setOrCreate(key,value)单向StorageProp(key)组件内的值不变的双向StorageLink(key) ,全局值均可变 import {MyUser} from ../model/MyUser
//创建AppStorage
AppStorage.setOrCreate(user,{name:jacklove,age:18})Entry
Component
struct AppStoragePage {//获取// StorageProp(user) user:MyUser {}StorageLink(user) user:MyUser {}build() {Column(){Text(用户名${this.user.name},年龄${this.user.age}).onClick(() {this.user.age this.user.age as number;//断言它是number类型this.user.age});ChildC()}}
}Component
struct ChildC {//获取// StorageProp(user) user:MyUser {}StorageLink(user) user:MyUser {}build() {Text(ChildC --- 用户名${this.user.name},年龄${this.user.age}).onClick(() {this.user.age this.user.age as number;//断言它是number类型this.user.age})}
}2.2 通过逻辑使用 AppStorage.Get(key) 获取数据AppStorage.Set(key,value) 覆盖数据const user:SubscribedAbstractProperty AppStorage.link(‘user’) 根据属性获取属性的值link.set(value) 修改值link.get() 获取值 import {MyUser} from ../model/MyUser
import promptAction from ohos.promptActionAppStorage.setOrCreateMyUser(user,{name:rose,age:20})Entry
Component
struct AppStroage2Page {StorageLink(user) user:MyUser {}build() {Column({space:30}){Text(Get).onClick((){//只做数据的获取const user AppStorage.getMyUser(user);promptAction.showToast({message:JSON.stringify(user)})console.log(hsy,JSON.stringify(user))})Text(Set).onClick(() {//只做数据的设置AppStorage.setMyUser(user,{name:jack爱,age:30})})Text(Link).onClick(() {//取出对象中的属性值,取出了userconst user:SubscribedAbstractPropertyMyUser AppStorage.link(user)user.set({name:蔡徐坤,age:26})})}}
}
