HarmonyOS 鸿蒙Next 关于@ObservedV2和@Trace装饰的类,ui不刷新怎么回事
HarmonyOS 鸿蒙Next 关于@ObservedV2和@Trace装饰的类,ui不刷新怎么回事
DiningFiltercomp({
DiningsFilterData: [
new filterItem('1', '类型1', '类型1-1', false),
new filterItem('2', '类型2', '类型2-1', false),
]
})
@ObservedV2
export class filterItem {
id?: string;
category?: string;
subCategoryName?: string;
imageUrl?: null;
@Trace isAll?: boolean=false;
constructor(id?: string, category?: string, subCategoryName?: string, isAll?: boolean) {
this.id = id;
this.category = category;
this.subCategoryName = subCategoryName;
this.isAll = isAll;
}
}
@ComponentV2
export struct DiningFiltercomp {
@Param DiningsFilterData: filterItem[] = []
@Param topHeight: number = 0
@Provider('isAllSelect') isAllSelect: boolean = false
build() {
Column() {
Column() {
Flex({ wrap: FlexWrap.Wrap, justifyContent: FlexAlign.SpaceBetween }) {
// 全选内容
Row({ space: 4 }) {
Text('All')
.fontColor(this.isAllSelect ? '#ff0000' : '#ccc')
.layoutWeight(1)
.fontSize(14)
}
.padding({ left: 10 })
.width('50%')
.margin({ top: 6, bottom: 6 })
.onClick(() => {
this.toggleAllSelection();
})
// 循环数据
ForEach(this.DiningsFilterData, (item: filterItem) => {
isSelectComp({ itemData: item, AllData: this.DiningsFilterData })
})
}
Divider().border({ width: 1, color: '#ccc' }).width('96%').offset({ x: -4 }).margin({ top: 18, bottom: 8 })
}
.padding({
left: 10,
top: 20,
bottom: 10
})
.width('100%')
.backgroundColor('#ddd')
}
.padding({ top: this.topHeight })
.width('96%')
}
private toggleAllSelection() {
this.isAllSelect = !this.isAllSelect;
for (let i = 0; i < this.DiningsFilterData.length; i++) {
this.DiningsFilterData[i].isAll = this.isAllSelect;
}
}
}
// 选项组件
@ComponentV2
export struct isSelectComp {
@Param itemData: filterItem = new filterItem()
@Param AllData: filterItem[] = []
@Consumer('isAllSelect') isAllSelect: boolean = false
build() {
Row({ space: 4 }) {
Text(String(this.itemData.isAll)).fontColor('#fff')
Text(this.itemData.subCategoryName)
.fontColor(this.itemData.isAll ? '#fff' : '#ccc')
.layoutWeight(1)
.fontSize(14)
}
.padding({ left: 10 })
.width('50%')
.margin({ top: 6, bottom: 6 })
.onClick(() => {
this.toggleItemSelection();
})
}
private toggleItemSelection() {
this.itemData.isAll = !this.itemData.isAll;
// promptAction.showToast({ message: JSON.stringify(this.itemData.isAll) });
// 控制全选状态
this.updateAllSelection();
}
private updateAllSelection() {
let allSelected = true;
for (let i = 0; i < this.AllData.length; i++) {
if (!this.AllData[i].isAll) {
allSelected = false;
break;
}
}
this.isAllSelect = allSelected;
}
}
@ObservedV2
export class filterItem {
id?: string;
category?: string;
subCategoryName?: string;
imageUrl?: null;
@Trace isAll?: boolean=false;
constructor(id?: string, category?: string, subCategoryName?: string, isAll?: boolean) {
this.id = id;
this.category = category;
this.subCategoryName = subCategoryName;
this.isAll = isAll;
}
}
@ComponentV2
export struct DiningFiltercomp {
@Param DiningsFilterData: filterItem[] = []
@Param topHeight: number = 0
@Provider('isAllSelect') isAllSelect: boolean = false
build() {
Column() {
Column() {
Flex({ wrap: FlexWrap.Wrap, justifyContent: FlexAlign.SpaceBetween }) {
// 全选内容
Row({ space: 4 }) {
Text('All')
.fontColor(this.isAllSelect ? '#ff0000' : '#ccc')
.layoutWeight(1)
.fontSize(14)
}
.padding({ left: 10 })
.width('50%')
.margin({ top: 6, bottom: 6 })
.onClick(() => {
this.toggleAllSelection();
})
// 循环数据
ForEach(this.DiningsFilterData, (item: filterItem) => {
isSelectComp({ itemData: item, AllData: this.DiningsFilterData })
})
}
Divider().border({ width: 1, color: '#ccc' }).width('96%').offset({ x: -4 }).margin({ top: 18, bottom: 8 })
}
.padding({
left: 10,
top: 20,
bottom: 10
})
.width('100%')
.backgroundColor('#ddd')
}
.padding({ top: this.topHeight })
.width('96%')
}
private toggleAllSelection() {
this.isAllSelect = !this.isAllSelect;
for (let i = 0; i < this.DiningsFilterData.length; i++) {
this.DiningsFilterData[i].isAll = this.isAllSelect;
}
}
}
// 选项组件
@ComponentV2
export struct isSelectComp {
@Param itemData: filterItem = new filterItem()
@Param AllData: filterItem[] = []
@Consumer('isAllSelect') isAllSelect: boolean = false
build() {
Row({ space: 4 }) {
Text(String(this.itemData.isAll)).fontColor('#fff')
Text(this.itemData.subCategoryName)
.fontColor(this.itemData.isAll ? '#fff' : '#ccc')
.layoutWeight(1)
.fontSize(14)
}
.padding({ left: 10 })
.width('50%')
.margin({ top: 6, bottom: 6 })
.onClick(() => {
this.toggleItemSelection();
})
}
private toggleItemSelection() {
this.itemData.isAll = !this.itemData.isAll;
// promptAction.showToast({ message: JSON.stringify(this.itemData.isAll) });
// 控制全选状态
this.updateAllSelection();
}
private updateAllSelection() {
let allSelected = true;
for (let i = 0; i < this.AllData.length; i++) {
if (!this.AllData[i].isAll) {
allSelected = false;
break;
}
}
this.isAllSelect = allSelected;
}
}
帮忙看下怎么回事
创建DiningsFilterData数据的问题吧,看我改的代码看能不能帮到你
已上代码,帮忙看下为啥ui不更新,关于是否选中
希望HarmonyOS能继续加强在安全性方面的研发,保护用户的隐私和数据安全。
已上代码,帮忙看下为啥ui不更新,关于是否选中
在HarmonyOS鸿蒙Next的开发环境中,如果遇到使用了@ObservedV2
和[@Trace](/user/Trace)
装饰的类后UI不刷新的问题,可能的原因及解决方案如下:
-
数据绑定问题:确保使用了
@ObservedV2
的字段确实被UI组件所绑定,并且字段值的变化能够触发UI的重新渲染。检查数据绑定的路径和表达式是否正确。 -
状态更新机制:
@ObservedV2
用于标记需要被系统观察的对象属性,当属性值变化时,应触发状态更新。如果属性变化未触发更新,可能是属性变化未正确通知系统,或存在其他逻辑阻止更新。 -
线程问题:UI更新应在主线程进行。如果属性更新是在非主线程中完成的,需要使用合适的线程切换机制(如
AbilitySlice.post
)来确保UI更新在主线程执行。 -
@Trace装饰器:
[@Trace](/user/Trace)
主要用于性能追踪,不影响UI更新。检查是否因性能问题间接影响了UI的流畅性。 -
代码错误:检查是否有其他代码逻辑错误或异常捕获导致UI更新被阻止。
如果问题依旧没法解决请联系官网客服,官网地址是:https://www.itying.com/category-93-b0.html。