在Swift中从UIScrollView创建PDF文件

我想根据UIScrollView的内容创建PDF文件.

I want to create a PDF file from the contents of a UIScrollView.

func createPdfFromView(aView: UIView, saveToDocumentsWithFileName fileName: String) {
    let pdfData = NSMutableData()
    let height = 1754.0
    let width = 1240.0
    UIGraphicsBeginPDFContextToData(pdfData, CGRect(x:-30, y:15,width:width,height:height) , nil)
    UIGraphicsBeginPDFPage()
    guard let pdfContext = UIGraphicsGetCurrentContext() else { return }

    aView.layer.render(in: pdfContext)
    UIGraphicsEndPDFContext()

    if let documentDirectories = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first {
        let documentsFileName = documentDirectories + "/" + fileName
        debugPrint(documentsFileName)
        pdfData.write(toFile: documentsFileName, atomically: true)
    }
}

我希望代码会生成一个基于滚动视图中内容大小的PDF.

I would expect that the code generates a PDF oriented on the size of the content in the scrollview.

该代码当前仅生成静态PDF.如果滚动视图中的内容大于PDF页面，则该内容将被剪切.

The code currently only generates a static PDF. If the content in the scrollview is bigger than the PDF page, the content is cut off.