createPdf(){
        var docDefinition = {
          content: [
            { text: 'REMINDER', style: 'header'},
            { text: new Date().toTimeString(), aligmente: 'right'},

            { text: 'From', style: 'subheader'},
            {text: this.letterObj.from},

            {text: 'To', style: 'subheader'},
            this.letterObj.to,

            {text: this.letterObj.text, style: 'story', margin: [0, 20, 0, 20]},

            {
              ul: [
                'Bacon',
                'Rips',
                'BBQ',
              ]
            }

          ],
          styles: {
            header: {
              fontSize: 14,
              bold: true,
              margin: [0, 15, 0, 0]
            },
            Story: {
              italic: true,
              alignment: 'center',
              width: '50%',
            }
          }

        }
        this.pdfObj = pdfMake.createPdf(docDefinition);
  }

  downloadPdf(){
      if(this.platform.is('cordova')){
          this.pdfObj.getBuffer((buffer) =>{
            var utf8 = new Uint8Array(buffer);
            var binaryArray = utf8.buffer;
            var blob = new Blob([binaryArray], { type: 'application/pdf'});

            this.file.writeFile(this.file.dataDirectory, 'myletter.pdf', blob, { replace: true}).then(fileEntry =>{
              this.fileOpener.open(this.file.dataDirectory + 'myletter.pdf', 'application/pdf');
            })
          })
      }else {
        this.pdfObj.download()
      }
  }