HarmonyOS List中字体大小的全局修改

参考示例如下：

//ChangFontSizePage
import { common } from '@kit.AbilityKit';
import { router } from '@kit.ArkUI';
import { emitter } from '@kit.BasicServicesKit';

@Observed
class listItem {
  title: string;
  date: string;
  origin: string;

  constructor(title: string, date: string, origin: string) {
    this.title = title
    this.date = date
    this.origin = origin
  }
}

const listData = [
  new listItem('通过这一部分内容的学习和初步实践，开发者可以快速构建出首个HarmonyOS应用，', '2014-01-02', 'HarmonyOS'),
  new listItem('掌握应用程序包结构、资源文件的使用、以及ArkTS的核心功能和语法等基础知识，为后续的应用开发奠定基础。',
    '2014-06-05', 'xxx',),
  new listItem('HarmonyOS SDK以Kit维度提供丰富、完备的开放能力，', '2014-01-02', 'HarmonyOS'),
  new listItem('API参考提供了HarmonyOS SDK各Kit开放能力的全量组件和接口的说明文档', '2014-01-02', 'xxx',)
]


@Entry
@Component
struct ChangFontSizePage {
  @State message: string = 'Hello World';
  @State fontSize: number = 14;
  private context = getContext(this) as common.UIAbilityContext
  @State list: listItem[] = []

  aboutToAppear() {
    this.list = listData
  }

  build() {
    Column() {
      List() {
        ForEach(this.list, (item: listItem) => {
          ListItem() {
            ChildCom({
              item: item,
              fontSize: this.fontSize
            })
          }
          .width('100%')
          .margin({
            bottom: 10
          })
        }, (item: listItem) => JSON.stringify(item))
      }

      Text(`${this.fontSize}`)
        .fontSize(this.fontSize)
    }
    .height('100%')
    .width('100%')
  }
}

@Component
struct ChildCom {
  @ObjectLink item: listItem
  @Link fontSize: number

  build() {
    Row() {
      Column() {
        CustomTitle({
          title: this.item.title,
          fontSize: this.fontSize
        })
        Row() {
          Text(this.item.origin)
            .fontColor('#666666')
            .textAlign(TextAlign.Start)
            .fontSize(12)
          Text(this.item.date)
            .fontColor('#666666')
            .textAlign(TextAlign.Start)
            .fontSize(12)
        }
        .width('100%')
      }
      .layoutWeight(1)
      .margin({
        right: 10
      })

      Image($r('app.media.app_icon'))
        .width(40)
        .height(40)
    }
    .width('100%')
    .padding(10)
    .backgroundColor(Color.Pink)
  }
}

@Component
struct CustomTitle {
  @Prop title: string = ''
  @Link fontSize: number
  private context = getContext(this) as common.UIAbilityContext
  
  aboutToAppear() {
    this.context.eventHub.on('changeFontSize', (fontSize: number) => {
      console.log(`fontSize-------${fontSize}`)
      this.fontSize = fontSize
    })

    // 定义一个eventId为1的事件
    let event: emitter.InnerEvent = {
      eventId: 1,
      priority: emitter.EventPriority.IMMEDIATE
    };

    // 收到eventId为1的事件后执行该回调
    let callback = (eventData: emitter.EventData): void => {
      console.log(`00000---${JSON.stringify(eventData.data)}`);

      this.fontSize = eventData.data?.fontSize

    };

    // 订阅eventId为1的事件
    emitter.on(event, callback);
  }

  build() {
    Text(this.title)
      .fontSize(this.fontSize)
      .maxLines(2)
      .textOverflow({ overflow: TextOverflow.Ellipsis })
      .textAlign(TextAlign.Start)
      .margin({
        bottom: 8
      })
      .onClick(() => {
        let size: number = this.fontSize + 2
        let event: emitter.InnerEvent = {
          eventId: 1,
          priority: emitter.EventPriority.IMMEDIATE
        };

        let eventData: emitter.EventData = {
          data: {
            fontSize: size,
          }
        };
        emitter.emit(event, eventData);
      })
  }
}
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