将PDF文档的创建从iOS移植到Mac OS X.

Question

我将我的代码从iPhone移植到Mac,我不知道如何在Mac中执行此操作.这是我试图转换的代码,我知道Mac中没有UIGraphic.有人能指点我指导或给我一个快速提示吗？谢谢.

NSString *newFilePath = @"path/to/your/newfile.pdf";
NSString *templatePath = @"path/to/your/template.pdf";

//create empty pdf file;
UIGraphicsBeginPDFContextToFile(newFilePath, CGRectMake(0, 0, 792, 612), nil);

CFURLRef url = CFURLCreateWithFileSystemPath (NULL, (CFStringRef)templatePath, kCFURLPOSIXPathStyle, 0);

//open template file
CGPDFDocumentRef templateDocument = CGPDFDocumentCreateWithURL(url);
CFRelease(url);

//get amount of pages in template
size_t count = CGPDFDocumentGetNumberOfPages(templateDocument);

//for each page in template
for (size_t pageNumber = 1; pageNumber <= count; pageNumber++) {
    //get bounds of template page
    CGPDFPageRef templatePage = CGPDFDocumentGetPage(templateDocument, pageNumber);
    CGRect templatePageBounds = CGPDFPageGetBoxRect(templatePage, kCGPDFCropBox);

    //create empty page with corresponding bounds in new document
    UIGraphicsBeginPDFPageWithInfo(templatePageBounds, nil);
    CGContextRef context = UIGraphicsGetCurrentContext();

    //flip context due to different origins
    CGContextTranslateCTM(context, 0.0, templatePageBounds.size.height);
    CGContextScaleCTM(context, 1.0, -1.0);

    //copy content of template page on the corresponding page in new file
    CGContextDrawPDFPage(context, templatePage);

    //flip context back
    CGContextTranslateCTM(context, 0.0, templatePageBounds.size.height);
    CGContextScaleCTM(context, 1.0, -1.0);

    /* Here you can do any drawings */
    [@"Test" drawAtPoint:CGPointMake(200, 300) withFont:[UIFont systemFontOfSize:20]];
}
CGPDFDocumentRelease(templateDocument);
UIGraphicsEndPDFContext();

Answer 1

使用CGPDFContextCreateWithURL而不是UIGraphicsBeginPDFContextToFile(参数非常相似).要开始/结束页面,请使用CGPDFContextBeginPage和CGPDFContextEndPage.当你完成后,打电话CGPDFContextClose而不是UIGraphicsEndPDFContext.

其余的可以保持不变 - 在iOS和Mac OS X上都存在Core Graphics - 这也意味着如果你想在两个平台上使用相同的代码,你也可以在iOS上使用我上面提到的功能.