如何在iPhone SDK中检测PDF文档的方向 [英] How to detect the orientation of a PDF document in iPhone SDK

问题描述

我目前正在使用CGPDFDocumnentRef开发一个简单的PDF阅读器.当我尝试渲染Portrait PDF文档时，一切都很好.但是，当我尝试在风景"中渲染一个时，它会显示一个旋转的PDF文档.当然，当我在pdf阅读器的网络浏览器中查看横向PDF文件时，它就是横向文件.

I am currently working for a simple PDF reader using CGPDFDocumnentRef. It is all fine when I try to render a Portrait PDF document. But when I try to render one in Landscape, it shows a rotated PDF document. Of course when I view that landscape PDF file in the web browser of a pdf reader, it is a landscape one.

iPhone SDK中是否有任何方法可以检测pdf文档的方向?

Is there any method in iPhone SDK that can detect the Orientation of a pdf document?

任何帮助将不胜感激.

关于， Xeron0719

Regards, Xeron0719

推荐答案

您可以尝试获取pdf的页面大小，然后检查width是否大于heigh并最终将其旋转...

You may try to get the page size of your pdf and then check if width is > than heigh and eventually rotate it...

-(CGSize)getPdfSize{
    CFURLRef pdfURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(), CFSTR("aPdfFile.pdf"), NULL, NULL);
    pdf = CGPDFDocumentCreateWithURL((CFURLRef)pdfURL);
    CGPDFPageRef page = CGPDFDocumentGetPage(pdf, 1);
    CGRect appR = CGPDFPageGetBoxRect (page, 1);
//  NSLog(@"          .....     pdf width: %f", appR.size.width); 
    return appR.size;
}

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