[Trans]AirPrint in webview transfer to PDF

本文主要是介绍[Trans]AirPrint in webview transfer to PDF，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

http://www.cnblogs.com/kiss007/archive/2012/06/26/2563662.html

实例1:

        Class printInteractionController = NSClassFromString(@"UIPrintInteractionController");if ((printInteractionController != nil) && [printInteractionController isPrintingAvailable]){printInteraction = [printInteractionController sharedPrintController];printInteraction.delegate = self;UIPrintInfo *printInfo = [NSClassFromString(@"UIPrintInfo") printInfo];printInfo.duplex = UIPrintInfoDuplexLongEdge;printInfo.outputType = UIPrintInfoOutputGeneral;printInfo.jobName = [webView stringByEvaluatingJavaScriptFromString:@"document.title"];printInteraction.printInfo = printInfo;printInteraction.showsPageRange = YES;UIViewPrintFormatter *formatter = [webView viewPrintFormatter];printInteraction.printFormatter = formatter;[printInteraction presentFromBarButtonItem:actionButtonItemanimated:YEScompletionHandler:^(UIPrintInteractionController *pic, BOOL completed, NSError *error) {}];}

实例2:

    Class printInteractionController = NSClassFromString(@"UIPrintInteractionController");if ((printInteractionController != nil) && [printInteractionController isPrintingAvailable]){NSURL *fileURL = document.fileURL; // Document file URLprintInteraction = [printInteractionController sharedPrintController];if ([printInteractionController canPrintURL:fileURL] == YES) // Check first{UIPrintInfo *printInfo = [NSClassFromString(@"UIPrintInfo") printInfo];printInfo.duplex = UIPrintInfoDuplexLongEdge;printInfo.outputType = UIPrintInfoOutputGeneral;printInfo.jobName = document.fileName;printInteraction.printInfo = printInfo;printInteraction.printingItem = fileURL;printInteraction.showsPageRange = YES;if ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPad){[printInteraction presentFromRect:button.bounds inView:button animated:YES completionHandler:^(UIPrintInteractionController *pic, BOOL completed, NSError *error){#ifdef DEBUGif ((completed == NO) && (error != nil)) NSLog(@"%s %@", __FUNCTION__, error);#endif}];}else // Presume UIUserInterfaceIdiomPhone{[printInteraction presentAnimated:YES completionHandler:^(UIPrintInteractionController *pic, BOOL completed, NSError *error){#ifdef DEBUGif ((completed == NO) && (error != nil)) NSLog(@"%s %@", __FUNCTION__, error);#endif}];}}}

利用UIPrintPageRenderer将html转换成pdf

Boss让我调查一下把html转换成PDF的方法，google之，有很多，都是用webview加载，截屏，转换。
于是去向Boss报告，结果他说这样转换成的pdf是纯图片的，不能对文本进行操作了，达不到想要的效果。
无奈，继续google。结果，再一次领略了stackoverflow的强大，最终找到一个解决方案：http://stackoverflow.com/q/9528658/966127
实现过程，子类化UIPrintPageRenderer

- (CGRect) paperRect
{if (!_generatingPdf)return [super paperRect];return UIGraphicsGetPDFContextBounds();
}- (CGRect) printableRect
{if (!_generatingPdf)return [super printableRect];return CGRectInset( self.paperRect, 20, 20 );
}- (NSData*) printToPDF
{_generatingPdf = YES;NSMutableData *pdfData = [NSMutableData data];UIGraphicsBeginPDFContextToData( pdfData, CGRectMake(0, 0, 792, 612), nil );  // letter-size, landscape[self prepareForDrawingPages: NSMakeRange(0, 1)];CGRect bounds = UIGraphicsGetPDFContextBounds();for ( int i = 0 ; i < self.numberOfPages ; i++ ){UIGraphicsBeginPDFPage();[self drawPageAtIndex: i inRect: bounds];}UIGraphicsEndPDFContext();_generatingPdf = NO;//    NSString* filename = @"/Volumes/Macintosh HD 2/test.pdf";
//    [pdfData writeToFile: filename  atomically: YES];return pdfData;
}

UIViewPrintFormatter *viewFormatter = [htmlWebView viewPrintFormatter];[ppRenderer addPrintFormatter:viewFormatter startingAtPageAtIndex:0];NSData *pdfData = [ppRenderer printToPDF];NSString *pdfPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/test.pdf"];[pdfData writeToFile:pdfPath atomically:YES];

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