ios - 从其他 PDF 创建多页 PDF

Question

我之前发布过 related question所以，但无济于事。然后我改变了我的方法并创建了尺寸完全相同的 PDF 等。所有这些 PDF 也只包含一页。

现在我想将这些单页 PDF 合并为一个多页 PDF。来自 here我想我已经知道创建多页 PDF 的步骤是什么了。

运行下面的代码后，将创建一个具有预期文件名的 PDF，但该 PDF 只有一页，而且完全是空白。

我在这里束手无策......请告诉我我做错了什么!是的，我相信某种循环会在这里起作用，但老实说，循环总是让我变得更好.... :(

任何帮助将不胜感激!

哦，我几乎不会 Swift - 请不要向我扔任何 Obj-C! ;)

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)

}

Answer 1

正如上面的评论中提到的，我发布的代码很糟糕。现在我已经解决了 - 多页 PDF 已创建。

我仍然需要处理我提到的那个循环，但现在这对我有用(没有循环):

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)
}

它可能不优雅，但它确实非常有效!

感谢我找到的信息here !