HarmonyOS 鸿蒙Next 有没有办法能计算Text文本的行数

可以尝试demo

import measure from '[@ohos](/user/ohos).measure'
[@Entry](/user/Entry)
[@Component](/user/Component)
struct MeasurePage {
 [@State](/user/State) rawTitle: string = "1月16日，国务院新闻办公室举行新闻发布会，介绍2024年春运形势及工作安排。从2月9日（除夕）00：00到2月17日（正月初八）24：00，免费9天。1月16日，国务院新闻办公室举行新闻发布会，介绍2024年春运形势及工作安排"
 // [@State](/user/State) rawTitle: string = "1月16日，国务院新闻办公室举行新闻发布会"
 [@State](/user/State) title: string = this.rawTitle //
 [@State](/user/State) suffixStr: string = ""
 expanded: Boolean = true
 titleWidth: number = 350
 needProcess: boolean = true
 ellipsis: string = "..."
 EXPAND_STR: string = "展开"
 COLLAPSE_STR: string = "收起"
 MAX_LINES: number =2;
 fontSize:number = 16

 aboutToAppear(): void {
   this.process();
 }
 process(): void {
   if (this.expanded) {
     this.collapseText();
   } else {
     this.expandText();
   }
 }

 expandText(): void {
   console.log('testTag: ' + this.needProcess);
   if (this.needProcess) {
     this.suffixStr = this.COLLAPSE_STR; //收起
     this.expanded = true;
     this.title = this.rawTitle;
   }
 }
 collapseText(): void {
   if (!this.needProcess) {
     return;
   }
   let titleSize : SizeOptions = measure.measureTextSize({
     textContent: this.rawTitle,
     constraintWidth: this.titleWidth,
     fontSize: this.fontSize
   })
   let twoLineSize : SizeOptions = measure.measureTextSize({
     textContent: this.rawTitle,
     constraintWidth: this.titleWidth,
     fontSize: this.fontSize,
     maxLines: this.MAX_LINES
   })
   //文本未超过限制行数，不进行展开、收起处理
   if ((titleSize.height as number) == (twoLineSize.height as number)) {
     this.needProcess = false;
     return;
   }
   console.log('test row height:' + titleSize.height)
   console.log('test twoLineSize height:' + twoLineSize.height)
   let clipTitle: string = this.rawTitle
   this.suffixStr = this.EXPAND_STR;
   while ((titleSize.height as number) > (twoLineSize.height as number)) {
     this.expanded = true;
     // 可以修改其他计算算法提高性能
     clipTitle = clipTitle.substring(0, clipTitle.length - 1);
     titleSize = measure.measureTextSize({
       // textContent: clipTitle + this.ellipsis + this.suffixStr,
       textContent: clipTitle + this.ellipsis ,
       constraintWidth: this.titleWidth,
       fontSize: this.fontSize
     })
     console.log("test while clipTitle:" + clipTitle)
     console.log("test while clipTitle height:" + titleSize.height)
   }
   console.log("test clipTitle:" + clipTitle)
   this.title = clipTitle + this.ellipsis
   this.expanded = false;
 }
 build() {
   Row() {
     Column() {
       Text(){
         Span(this.title)
       }
       .fontSize(this.fontSize)
       .id("title")
       .width(this.titleWidth)

       if (this.needProcess) {
         Text(this.suffixStr)
           .fontColor(Color.Orange)
           .onClick((event) => {
             this.process();
           })
       }
     }
     .width('100%')
     .alignItems(HorizontalAlign.Start)
   }
   .height('100%')
 }
}