HarmonyOS 局部刷新，网络请求回数据后，刷新某个值

List中的某个ListItem，ListItem中有swiper，swiper里面有4个view，每个view都是一个List，forEach循环渲染。

这个ListItem的数据间隔10秒从网络重新请求。

如果请求完的数据，直接赋值给老的数据的话：

1.ListItem中有swiper重新创建，后面的view全部重新创建，比较耗费性能。

2.ListItem中有swiper不重新创建，swiper绑定的是之前的数据，新数据赋值过去更改的话，UI也不会刷新。

最好的办法，就是对比2个对象，把新对象的数据都赋值给老的对象。或者是有变动的值赋值给老的对象，这种需求应该怎么实现呢？

对象如下：

@ObservedV2  
export class MergeCellData implements CellType {  
  cardData?: CardData;  
  itemType: ItemType;  
  key?: string;  
  @Trace items: Array<SubPickData | SubEvaluateData> = new Array();  
  titles: string[] = [];  
  }  
}  
@ObservedV2  
export class SubPickData  {  
  subCardData: SubCardData;  
  @Trace cell: Array<MoneyPickData|NewsPickData|BasicPickData|TechnologyPickData> = new Array();  
  constructor(subCardData: SubCardData,cell: Array<MoneyPickData|NewsPickData|BasicPickData|TechnologyPickData>) {  
    this.subCardData = subCardData;  
    this.cell = cell;  
  }  
}  
@ObservedV2  
export class MoneyPickData extends BaseChartPickData {  
  @Trace downCount: number;  
  @Trace flatCount: number;  
  @Trace fundCode: string;  
  @Trace fundJumpUrl: string;  
  @Trace fundName: string;  
  @Trace plateChangeRate: string;  
  @Trace plateDesc: string;  
  @Trace plateFundFlow: string;  
  @Trace plateFundFlowDesc: string;  
  @Trace plateFundName: string;  
  @Trace plateHisFundDesc: string;  
  @Trace plateJumpUrl: string;  
  @Trace plateName: string;  
  @Trace upCount: number;  
  @Trace topStocks: StockChgData[];  
}

HarmonyOS

Heiang

2024-10-16 11:45:25

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回答 1

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回答 1

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superinsect

参考代码：

@Component  
struct Child {  
  @Link items: TestList[];  
  build() {  
    Column() {  
      ForEach(this.items, (item: TestList) => {  
        ChildChild({ item: item });  
      })  
      Button(Button:  
      push  
      )  
      .onClick(() => {  
        this.items[0].index1 = 3;  
        this.items[0].str = 'Third';  
      })  
    }  
  }  
}  
@Component  
struct ChildChild {  
  @State item: TestList = new TestList();  
  build() {  
    Column() {  
      Text($  
      {  
        this.item.index1  
      }  
      +'-----'  
      $  
      {  
        this.item.str  
      }  
      )  
    }  
  }  
}  
  
@Entry  
@Component  
struct Parent {  
  @State arr: TestList[] = [];  
  aboutToAppear() {  
    let test1: TestList = new TestList();  
    test1.index1 = 1;  
    test1.str = 'First';  
    this.arr.push(test1)  
    let test2: TestList = new TestList();  
    test2.index1 = 2;  
    test2.str = 'Second';  
    this.arr.push(test2)  
  }  
  build() {  
    Column() {  
      Child({ items: this.arr })  
      Button(Button:  
      push  
      )  
      .onClick(() => {  
        this.arr[1].index1 = 4;  
        this.arr[1].str = 'Fourth';  
      })  
    }  
  }  
}  
@Observed  
class TestList {  
  index1: number = 0;  
  str: string = '';  
}

2024-10-16 16:58:22

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HarmonyOS 局部刷新，网络请求回数据后，刷新某个值

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