iOS生成PDF的关键代码-备忘

//此方法只是把当前页面的内容生成PDF并保存在沙盒中。

//还需要做：把当前面没有显示的内容以分页的形式生成PDF，并把PDF读取并显示出来

//关于显示可以参考：念茜的博客 iOS开发笔记——PDF的显示和浏览 （http://blog.csdn.net/yiyaaixuexi/article/details/7645725）

//Create empty PDF context on iPhone for later randering in it

-(CGContextRef) createPDFContext:(CGRect)inMediaBox path:(CFStringRef) path

{

    CGContextRef myOutContext = NULL;

    CFURLRef url;

    url = CFURLCreateWithFileSystemPath (NULL, // 1

                                         path,

                                         kCFURLPOSIXPathStyle,

                                         false);

    if (url != NULL) {

        myOutContext = CGPDFContextCreateWithURL (url,// 2

                                                  &inMediaBox,

                                                  NULL);

        CFRelease(url);// 3

    }

    return myOutContext;// 4

}

 

/**

 *  把当前页面绘制成PDF并保存

 */

- (void)drawPDF{

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *documentsDirectory = [paths objectAtIndex:0];

    //PDF保存的路径

    NSLog(@"documentsDirectory:%@",documentsDirectory);

    NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:@"tmp.pdf"];

    

    CGContextRef pdfContext = [self createPDFContext:self.view.bounds path:(CFStringRef)writableDBPath];

    

    NSLog(@"PDF Context created");

    CGContextBeginPage (pdfContext,nil); // 6

    

    //turn PDF upsidedown

    CGAffineTransform transform = CGAffineTransformIdentity;

    transform = CGAffineTransformMakeTranslation(0, self.view.bounds.size.height);

    transform = CGAffineTransformScale(transform, 1.0, -1.0);

    CGContextConcatCTM(pdfContext, transform);

    

    //Draw view into PDF

    [self.view.layer renderInContext:pdfContext];

    

    CGContextEndPage (pdfContext);// 8

    CGContextRelease (pdfContext);

}