Ios 从html转换为pdf时，https图像链接不会以pdf格式显示

https图像链接未显示在pdf中，但http图像链接在将html转换为pdf时显示在pdf中。但在UIWebview中，我可以看到两者的图像，有人能帮忙吗

让logoImageURL=”https://firebasestorage.googleapis.com/v0/b/getbilleasy1.appspot.com/o/Images%2F1F057F2D-BF61-4EAB-8D0A-D286BEA957C9.png？alt=media&token=95bbd8e7-b12d-4d8f-beda-e911aa3f493f“

让logoImageURL=”http://www.alertinfo.in/wp-content/uploads/2016/12/Putin-behind-Trump-win-324x160.jpg“

我正在尝试两个链接

`导入UIKit

类InvoiceComposer:NSObject{

let pathToInvoiceHTMLTemplate = Bundle.main.path(forResource: "invoice", ofType: "html")

let pathToSingleItemHTMLTemplate = Bundle.main.path(forResource: "single_item", ofType: "html")

let pathToLastItemHTMLTemplate = Bundle.main.path(forResource: "last_item", ofType: "html")
let senderInfo = UserDefaults.standard.object(forKey: "COMPANYDETAILSPDF") as? String




let dueDate = ""

let paymentMethod = "Cash"

//让logoImageURL=UserDefaults.standard.object（forKey：“LOGO”）作为？字符串 var Image\u url:String！ 让logoImageURL=“”

//让logoImageURL=“” var发票编号：字符串

var pdfFilename: String!
  var invoices: [[String: AnyObject]]!

override init() {
    super.init()
}


func renderInvoice(invoiceNumber: String,invoiceDate: String,  recipientInfo: String,  totalAmount: String,items: [[String: String]]) -> String! {

    self.invoiceNumber = invoiceNumber

    do {
        // Load the invoice HTML template code into a String variable.
        var HTMLContent = try String(contentsOfFile: pathToInvoiceHTMLTemplate!)

        // Replace all the placeholders with real values except for the items.
        // The logo image.
        HTMLContent = HTMLContent.replacingOccurrences(of: "#LOGO_IMAGE#", with: logoImageURL)

        // Invoice number.
        HTMLContent = HTMLContent.replacingOccurrences(of: "#INVOICE_NUMBER#", with: invoiceNumber)

        // Invoice date.
        HTMLContent = HTMLContent.replacingOccurrences(of: "#INVOICE_DATE#", with: invoiceDate)

        // Due date (we leave it blank by default).
        HTMLContent = HTMLContent.replacingOccurrences(of: "#DUE_DATE#", with: dueDate)

        // Sender info.
        HTMLContent = HTMLContent.replacingOccurrences(of: "#SENDER_INFO#", with: senderInfo!)

        // Recipient info.
        print(recipientInfo)
        HTMLContent = HTMLContent.replacingOccurrences(of: "#RECIPIENT_INFO#", with: recipientInfo.replacingOccurrences(of: "\n", with: "<br>"))

        // Payment method.
        HTMLContent = HTMLContent.replacingOccurrences(of: "#PAYMENT_METHOD#", with: paymentMethod)

        // Total amount.
        HTMLContent = HTMLContent.replacingOccurrences(of: "#TOTAL_AMOUNT#", with: totalAmount)

        // The invoice items will be added by using a loop.
        var allItems = ""

        // For all the items except for the last one we'll use the "single_item.html" template.
        // For the last one we'll use the "last_item.html" template.

        print(items.count)
        for i in 0..<items.count {
            var itemHTMLContent: String!

            // Determine the proper template file.
            if i != items.count - 1 {
                itemHTMLContent = try String(contentsOfFile: pathToSingleItemHTMLTemplate!)
            }
            else {
                itemHTMLContent = try String(contentsOfFile: pathToLastItemHTMLTemplate!)
            }

            // Replace the description and price placeholders with the actual values.
            itemHTMLContent = itemHTMLContent.replacingOccurrences(of: "#ITEM_DESC#", with: items[i]["item"]!)

            // Format each item's price as a currency value.
            let formattedPrice = items[i]["price"]!
            itemHTMLContent = itemHTMLContent.replacingOccurrences(of: "#PRICE#", with: formattedPrice)

            // Add the item's HTML code to the general items string.
            allItems += itemHTMLContent
        }

        // Set the items.
        HTMLContent = HTMLContent.replacingOccurrences(of: "#ITEMS#", with: allItems)



        // The HTML code is ready.
        return HTMLContent

    }
    catch {
        print("Unable to open and use HTML template files.")
    }

    return nil
}


func exportHTMLContentToPDF(HTMLContent: String) {
    let printPageRenderer = CustomPrintPageRenderer()

    let printFormatter = UIMarkupTextPrintFormatter(markupText: HTMLContent)
    printPageRenderer.addPrintFormatter(printFormatter, startingAtPageAt: 0)

    let pdfData = drawPDFUsingPrintPageRenderer(printPageRenderer: printPageRenderer)

    pdfFilename = "\(AppDelegate.getAppDelegate().getDocDir())/Invoice\(invoiceNumber!).pdf"

    UserDefaults.standard.set(pdfFilename, forKey:"PDFFILENAME")
    UserDefaults.standard.synchronize()
    pdfData?.write(toFile: pdfFilename, atomically: true)

    print(pdfFilename)


}


func drawPDFUsingPrintPageRenderer(printPageRenderer: UIPrintPageRenderer) -> NSData! {
    let data = NSMutableData()

    UIGraphicsBeginPDFContextToData(data, CGRect.zero, nil)

    UIGraphicsBeginPDFPage()

    printPageRenderer.drawPage(at: 0, in: UIGraphicsGetPDFContextBounds())

    UIGraphicsEndPDFContext()

    return data
}

var-pdfFilename:String！
var发票：[[String:AnyObject]]！
重写init（）{
super.init（）
}
func renderInvoice（发票编号：String，发票日期：String，收件人信息：String，合计金额：String，项目：[[String:String]]）->String{
self.invoiceNumber=invoiceNumber
做{
//将发票HTML模板代码加载到字符串变量中。
var HTMLContent=try String（contentsOfFile:pathtoincehtmltemplate！）
//将除项目外的所有占位符替换为实际值。
//标志图像。
HTMLContent=HTMLContent.replacingOccurrences（of:“#LOGO#u IMAGE#”，with:logoImageURL）
//发票号码。
HTMLContent=HTMLContent.replacingOccurrences（of:#发票#编号#），带：发票编号）
//发票日期。
HTMLContent=HTMLContent.replacingOccurrences（of:#发票#日期#），带：发票日期）
//到期日（我们默认为空）。
HTMLContent=HTMLContent.replacingOccurrences（of:“#到期日#”，with:dueDate）
//发件人信息。
HTMLContent=HTMLContent.replacingOccurrences（of:“#发送者#信息#”，with:senderInfo！）
//收件人信息。
打印（收件人信息）
HTMLContent=HTMLContent.replacingOccurrences（of:#RECIPIENT_INFO#），with:recipientInfo.replacingOccurrences（of:“\n”，with:
”）
//付款方式。
HTMLContent=HTMLContent.replacingOccurrences（of:#PAYMENT#u METHOD#，with:paymentMethod）
//总数。
HTMLContent=HTMLContent.replacingOccurrences（of:#TOTAL#u AMOUNT#，with:totalAmount）
//将使用循环添加发票项。
var allItems=“”
//对于除最后一个之外的所有项目，我们将使用“single_item.html”模板。
//对于最后一个，我们将使用“last_item.html”模板。
打印（项目数）
对于0..NSData中的i{
let data=NSMutableData（）
UIGraphicsBeginPDFContextToData（数据，CGRect.zero，nil）
UIGraphicsBeginPDFPage（）
printPageRenderer.drawPage（位于：0，在：UIGraphicsGetPDFContextBounds（）中）
UIGraphicsSendPdfContext（）
返回数据
}

}

---

`有什么解决方案吗？

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