为什么在尝试创建 PDF 版本的 flex 组件时 PDF 为空白

Question

我有一个flex组件，一个VBox，里面有内容。主要是文本组件。

VBox 正在保存一个我希望能够保存为 PDF 的报告。我正在使用AlivePdf来实现这一点，但是在Adobe阅读器（最新版本）中查看时生成的PDF是空白的。

当我在记事本++中打开PDF时，我可以看到其中肯定有内容，并且文件的结构似乎正确。

这是我用来生成 PDF 的方法：

private function doPrint(whatToPrint:UIComponent):void
{
    var printPDF:PDF = new PDF( Orientation.LANDSCAPE, Unit.MM, Size.A4 );
    printPDF.setDisplayMode( Display.FULL_PAGE, Layout.SINGLE_PAGE );
    printPDF.addPage();
    printPDF.addImage( whatToPrint, 0, 0, 0, 0, 'PNG', 100, 1, ResizeMode.FIT_TO_PAGE );
    // The string here looks to have produced a valid PDF but it doesn't render correctly
    var content:String = printPDF.save(Method.LOCAL);
    // Custom save file data in here, removed for clarity of issue
}

Answer 1

试试这个：

private function doPrint(whatToPrint:UIComponent):void
{
    var printPDF:PDF = new PDF( Orientation.LANDSCAPE, Unit.MM, Size.A4 );
    printPDF.setDisplayMode( Display.FULL_PAGE, Layout.SINGLE_PAGE );
    whatToPrint.validateNow();
    printPDF.addPage();
    printPDF.addImage( whatToPrint, 0, 0, 0, 0, 'PNG', 100, 1, ResizeMode.FIT_TO_PAGE );
    // The string here looks to have produced a valid PDF but it doesn't render correctly
    var content:String = printPDF.save(Method.LOCAL);
    // Custom save file data in here, removed for clarity of issue
}