HarmonyOS 组件刷新问题

struct MyFoldPage {
  @State filePaths: FolderModel[] = []
   build() {
      Column(){
            Grid() {
            ForEach(this.filePaths, (item: FolderModel, index: number) => {
              GridItem() {
                this.ItemBuilder(index)
              }
            }, (item: FolderModel) => item.fileName)
          }
         }
     }
}
export class FolderModel {
  filePath: string = ''
  fileName: string = ''
  isScreenshot: boolean = true
  thumbnailPath?: string = ''   //当文件是视频的时候，抓视频的缩略图pixelMap
  isSelect?: boolean = false
}

现在有个问题是修改了数组内部item类里面isSelect的值，整个列表不会自动刷新，必须要新new一个item并重新赋值给filepaths才能更新，有没有比较好的实现方式