起因：手贱造轮子的老毛病又犯了

基于：鸿蒙SDK 版本3.1.0 API9 stage模型

下载链接：https://gitee.com/kaiyuanguo/harmony_-demo/tree/master/

使用说明↓

 /*
    // 1.简约方式（只支持传入显示类型 + 提示语） ↓
    this.hudItem.showHud(BDHudType.loading)

    setTimeout(() => { // 最好弄个 实例对象控制下 此定时器完成任务后 进行销毁，这就不写了
      this.hudItem.close()
    },2000)

    this.hudItem.showHud(BDHudType.loading,'我正给嫩加载着嘞') // 自定义提示语  


    // 2.链式方式（全功能 + 方便扩展） ↓
    this.hudItem.showHudChian()
      .setDisplayType(BDHudType.success)
      .setDismisTime(2000)
      .setMsgStr('提示语')
      .setIconSrc('/components/BDHud/testSrc.gif')
      
    */

/*
 *        hudItem.showHud(BDHudType.loading)
 *       或者自定义提示语 hudItem.showHud(BDHudType.loading,'我正给嫩加载着嘞')
 *       success提示 和error提示也一样这样传入自定义提示语
 *
 *        success 和 error 默认会自动消失 默认2s后 自动消失
 *       loading 默认不自动消失 需要用户在外部手动控制 hudItem.close()
 * 
 * */

代码实现↓

export enum BDHudType{
  msg,      //单提示语
  loading,  //加载框
  success,  //成功提示
  error     //错误提示
}

export  class BDHudClass {
  public show: boolean;   //是否显示
  public displayType: BDHudType; //显示类型
  public msgStr: string = '';  //提示语
  public iconSrc:string = '';
  public hudStatus:boolean = false;

  public showHud(displayType: BDHudType,msgStr?: string){
    this.hudStatus = true;
    this.show = true;
    this.displayType = displayType;

    if(displayType == BDHudType.loading){
      this.iconSrc = '/components/BDHud/loading_hud.gif'
      this.msgStr = msgStr == undefined ? '加载中':msgStr;

    }

    if(displayType == BDHudType.success){
      this.iconSrc = '/components/BDHud/success_hud.png'
      this.msgStr = msgStr == undefined ? '成功':msgStr;
    }

    if(displayType == BDHudType.error){
      this.iconSrc = '/components/BDHud/error_hud.png'
      this.msgStr = msgStr == undefined ? '错误/失败':msgStr;
    }

    if(displayType == BDHudType.msg){
      this.iconSrc = ''
      this.msgStr = msgStr == undefined ? '提示语':msgStr;
    }

  }

  // 外部调用手动销毁
  public close(){
    this.hudStatus = false;
    this.show = false;
  }

  // 构造函数
  constructor(show:boolean = false, displayType:BDHudType = BDHudType.msg,msgStr: string = '',iconSrc:string = '') {
    this.show = show;
    this.displayType = displayType;
    this.msgStr = msgStr;
    this.iconSrc = iconSrc;
  }


}

@Component
export default struct BDHud{
  @Link @Watch('itemChange') hudItem:BDHudClass
  @State ZIndex:number = -1
  @State boxShow:boolean = false
  @State iconShow:boolean = false
  @State textShow:boolean = false
  private timeoutID:any

  itemChange(){
    clearTimeout(this.timeoutID);

    this.boxShow = this.hudItem.show
    this.iconShow = this.hudItem.iconSrc.length == 0 ? false:true;
    this.textShow = this.hudItem.msgStr.length == 0 ? false:true;

    if(this.boxShow == true){
      this.ZIndex = 999
    }else {
      this.ZIndex = -1;
    }

    if(this.hudItem.displayType == BDHudType.success || this.hudItem.displayType == BDHudType.error || this.hudItem.displayType == BDHudType.msg){
      var that = this
      clearTimeout(this.timeoutID);
      this.timeoutID = setTimeout(() => {
        that.boxShow = false
        that.hudItem.show = false
        that.hudItem.hudStatus = false;
      },2000)

    }

  }


  build(){
    Stack(){
      Column(){
        Image(this.hudItem.iconSrc)
          .iconImg()
          .visibility(this.iconShow ? Visibility.Visible : Visibility.None)

        Text(this.hudItem.msgStr)
          .lineHeight(28)
          .padding({top:this.iconShow ? 15:0})
          .msgText()
          .visibility(this.textShow ? Visibility.Visible : Visibility.None)

      }
      .padding({top:this.iconShow ? 18:10,bottom:15,left:15,right:15})
      .box()

    }
    .zIndex(this.ZIndex)
    .visibility(this.boxShow == true ? Visibility.Visible:Visibility.None)

  }
}

@Extend(Text) function msgText(){
  .fontColor(Color.White)
  .fontSize(15)
}

@Extend(Image) function iconImg(){
  .width(60)
  .height(60)
}

@Extend(Column) function box() {
  .constraintSize({minWidth:135,maxWidth:300})
  .backgroundColor('rgba(0,0,0,0.5)')
  .borderRadius(5)
}

参考链接:https://github.com/ChanggnahC/YLLoadingHUD