使用gofpdf生成PDF时如何实现换行且不重叠列表

问题描述 #

使用gofpdf生成PDF时，循环渲染pdfData.Approval.ReviewedBy中的条目时出现重叠，期望每个条目单独一行显示，但实际所有内容都堆叠在同一位置。

原始代码：

pdf.SetFont("arial", "B", 12)
pdf.SetFont("Helvetica", "", fontXs)
pdf.Text(88, 129.9, "Prepared By")
prLeft := (120.1)
prRight := (544.20 - 2*10) / 4
pdf.SetX(prLeft)
pdf.SetY(prRight)
pdf.SetFont("Helvetica", "b", fontXs)
pdf.CellFormat(20, 4, "", "", 0, "b", false, 0, "")
pdf.CellFormat(40, 4, "Name", "1", 0, "b", false, 0, "")
pdf.CellFormat(41, 4, "Title", "1", 0, "b", false, 0, "")
pdf.CellFormat(43, 4, "Division", "1", 0, "b", false, 0, "")
pdf.CellFormat(40, 4, "Signature & Date", "1", 0, "b", false, 0, "")

for _, dataRev := range pdfData.Approval.ReviewedBy {
    pdf.SetFont("arial", "B", 12)
    pdf.SetFont("Helvetica", "", fontXs)
    pdf.Text(88, 148.1, "Reviewed By")
    asLeft := (220.1)
    asRight := (615.10 - 2*10) / 4
    pdf.SetX(asLeft)
    pdf.SetY(asRight)
    pdf.CellFormat(20, 12, "", "", 0, "", false, 0, "")
    pdf.CellFormat(40, 12, dataRev.Name, "1", 0, "", false, 0, "")
    pdf.CellFormat(41, 12, dataRev.Title, "1", 0, "", false, 0, "")
    pdf.CellFormat(43, 12, dataRev.Division, "1", 0, "", false, 0, "")
    pdf.CellFormat(40, 12, dataRev.SignatureDate, "1", 0, "", false, 0, "")
    
}

其中pdfData.Approval.ReviewedBy是包含多个元素的slice。

问题原因 #

1. 循环内每次将Y坐标设置为固定值asRight，所有条目绘制在同一位置，造成重叠
2. "Reviewed By"文本在循环内重复输出，多次覆盖同一位置
3. 未处理换行逻辑，循环后未累加行高实现向下偏移

修改后的代码 #

pdf.SetFont("arial", "B", 12)
pdf.SetFont("Helvetica", "", fontXs)
pdf.Text(88, 129.9, "Prepared By")
prLeft := 120.1
prRight := (544.20 - 2*10) / 4
pdf.SetX(prLeft)
pdf.SetY(prRight)
pdf.SetFont("Helvetica", "b", fontXs)
pdf.CellFormat(20, 4, "", "", 0, "b", false, 0, "")
pdf.CellFormat(40, 4, "Name", "1", 0, "b", false, 0, "")
pdf.CellFormat(41, 4, "Title", "1", 0, "b", false, 0, "")
pdf.CellFormat(43, 4, "Division", "1", 0, "b", false, 0, "")
pdf.CellFormat(40, 4, "Signature & Date", "1", 0, "b", false, 0, "")

// 将"Reviewed By"移到循环外，仅绘制一次
pdf.SetFont("arial", "B", 12)
pdf.SetFont("Helvetica", "", fontXs)
pdf.Text(88, 148.1, "Reviewed By")
asLeft := 220.1
// 初始化起始Y坐标，后续动态累加
currentY := (615.10 - 2*10) / 4
// 统一行高，与CellFormat高度匹配
rowHeight := 12.0

for _, dataRev := range pdfData.Approval.ReviewedBy {
    pdf.SetFont("Helvetica", "", fontXs)
    pdf.SetX(asLeft)
    pdf.SetY(currentY)
    pdf.CellFormat(20, rowHeight, "", "", 0, "", false, 0, "")
    pdf.CellFormat(40, rowHeight, dataRev.Name, "1", 0, "", false, 0, "")
    pdf.CellFormat(41, rowHeight, dataRev.Title, "1", 0, "", false, 0, "")
    pdf.CellFormat(43, rowHeight, dataRev.Division, "1", 0, "", false, 0, "")
    pdf.CellFormat(40, rowHeight, dataRev.SignatureDate, "1", 0, "", false, 0, "")
    
    // 累加行高，实现换行
    currentY += rowHeight
}

关键修改说明 #

• 把"Reviewed By"的渲染逻辑移到循环外，避免重复绘制
• 用currentY变量动态跟踪当前行位置，每次循环后累加行高，确保下一行内容向下偏移
• 统一行高变量，方便后续调整单元格高度

内容的提问来源于stack exchange，提问作者dimas tatag anditya