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);

}