从其他PDF创建多页PDF [英] Create Multi-Page PDF from other PDFs

问题描述

我以前发布了

I've previously posted a related question on SO, but to no avail. I then changed my approach and created PDFs which all have the exact same dimensions, etc. All these PDFs also consists of one page only.

现在，我想将这些单页PDF合并为一个多页PDF.来自此处我想我已经确定了创建多页PDF的步骤.

Now I would like to combine these single page PDFs into one multi-page PDF. From here I think I've figured what the steps are in creating the multi-page PDF.

运行下面的代码后，将创建具有所需文件名的PDF，但该PDF仅包含一页，并且完全空白.

After running the code below, a PDF with the expected file name is created, but the PDF consists of only one page, and it is entirely blank.

我在这里很机智...请告诉我我做错了！是的，我相信这里会有某种循环，但是老实说，LOOPS总是让我变得更好....:(

I'm at wits' end here... Please tell me what I'm doing wrong! Yes, I believe some sort of loop will work here but, to be honest, LOOPS have always gotten the better of me.... :(

任何帮助将不胜感激！

Any help will be greatly appreciated!

哦，我几乎无法使用Swift-请不要向我扔任何Obj-C！ ;)

Oh, and I can barely Swift - please do not throw any Obj-C at me! ;)

这是我的代码:

func CreateCombinedPDF() {

    let pdf01 = String("\(newDetailsLogIdentifier)_PAGE01.pdf")
    let pdf02 = String("\(newDetailsLogIdentifier)_PAGE02.pdf")

    //STEPS IN CREATING A COMBINED PDF

    // 1. CGPDFDocumentCreateWithURL
    // 2. CGContextBeginPage
    // 3. CGPDFDocumentGetPage
    // 4. CGPDFContextCreateWithURL
    // 5. CGContextDrawPDFPage
    // 6. CGContextEndPage
    // 7. CGPDFContextClose

    var mediaBox:CGRect = CGRectMake(0, 0, 820, 1170)
    let documentsURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]
    let combinedDocumentFileName = documentsURL.URLByAppendingPathComponent("\(newDetailsLogIdentifier)_COMBINED.pdf")
    let fullPathCombinedDocument = combinedDocumentFileName.path!
    let myCombinedDocumentURL = NSURL(fileURLWithPath: fullPathCombinedDocument)
    let myContextCombinedDocument = CGPDFContextCreateWithURL(myCombinedDocumentURL, &mediaBox, nil)

    let fileNamePDF01 = documentsURL.URLByAppendingPathComponent(pdf01)
    let fullPathPDF01 = fileNamePDF01.path!
    let urlPDF01 = NSURL(fileURLWithPath: fullPathPDF01)
    let myContextPDF01 = CGPDFContextCreateWithURL(urlPDF01, &mediaBox, nil)
    CGPDFContextBeginPage(myContextPDF01, nil)
    //Here's my problem - I think...
    CGContextDrawPDFPage(myContextPDF01, nil)
    CGPDFContextEndPage(myContextPDF01)

    let fileNamePDF02 = documentsURL.URLByAppendingPathComponent(pdf02)
    let fullPathPDF02 = fileNamePDF02.path!
    let urlPDF02 = NSURL(fileURLWithPath: fullPathPDF02)
    let myContextPDF02 = CGPDFContextCreateWithURL(urlPDF02, &mediaBox, nil)
    CGPDFContextBeginPage(myContextPDF02, nil)
    //Here's my problem - I think...
    CGContextDrawPDFPage(myContextPDF02, nil)
    CGPDFContextEndPage(myContextPDF02)

    CGPDFContextClose(myContextCombinedDocument)

}

推荐答案

正如上面的评论中提到的，我发布的代码简直就是废话.现在我已经整理好了-创建了多页PDF.

As mentioned in the comments above, the code I've posted was crap. Now I've got it sorted out - the multi-page PDF gets created.

我仍然必须处理我提到的那个循环，但是现在这对我有用(没有循环):

I still have to work on that loop I've mentioned, but for now this works for me (without a loop):

func CreateCombinedPDF() {

    //Set all constants and variables needed
    var mediaBox:CGRect = CGRectMake(0, 0, 820, 1170)
    let documentsURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]
    let combinedDocumentFileName = documentsURL.URLByAppendingPathComponent("\(newDetailsLogIdentifier)_COMBINED.pdf")
    let fullPathCombinedDocument = combinedDocumentFileName.path!
    let myCombinedDocumentURL = NSURL(fileURLWithPath: fullPathCombinedDocument)

    let pdf01 = String("\(newDetailsLogIdentifier)_PAGE01.pdf")
    let fileNamePDF01 = documentsURL.URLByAppendingPathComponent(pdf01)
    let fullPathPDF01 = fileNamePDF01.path!
    let urlPDF01 = NSURL(fileURLWithPath: fullPathPDF01)
    let contextPDF01 = CGPDFDocumentCreateWithURL(urlPDF01)
    let pdf01Page = CGPDFDocumentGetPage(contextPDF01,1)

    let pdf02 = String("\(newDetailsLogIdentifier)_PAGE02.pdf")
    let fileNamePDF02 = documentsURL.URLByAppendingPathComponent(pdf02)
    let fullPathPDF02 = fileNamePDF02.path!
    let urlPDF02 = NSURL(fileURLWithPath: fullPathPDF02)
    let contextPDF02 = CGPDFDocumentCreateWithURL(urlPDF02)
    let pdf02Page = CGPDFDocumentGetPage(contextPDF02,1)

    // 1. Create the PDF context that will become the new PDF file
    let myContextCombinedDocument = CGPDFContextCreateWithURL(myCombinedDocumentURL, &mediaBox, nil)

    // 2.  Insert pages

    //Draw PAGE01.pdf
    CGPDFContextBeginPage(myContextCombinedDocument, nil);
    CGContextDrawPDFPage(myContextCombinedDocument, pdf01Page)
    CGPDFContextEndPage(myContextCombinedDocument)

    //Draw PAGE02.pdf
    CGPDFContextBeginPage(myContextCombinedDocument, nil);
    CGContextDrawPDFPage(myContextCombinedDocument, pdf02Page)
    CGPDFContextEndPage(myContextCombinedDocument)

    // 3.  All pages inserted.  Now close and save the new document.
    CGPDFContextClose(myContextCombinedDocument)
}

它可能并不优雅，但可以确定地狱般奏效！

It might not be elegant, but it sure as hell works!

对我在此处找到的信息表示敬意！

Kudos to the information I found here!

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