IOS 绘制PDF -转

-(void)createPdf:(UIImage *)img andText:(NSString *)text{
      NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
      NSString *saveDirectory = [paths objectAtIndex:];
      NSString *saveFileName = @"myPDF.pdf";
      NSString *newFilePath = [saveDirectory stringByAppendingPathComponent:saveFileName];
      const char *filename = [newFilePath UTF8String];
      CGRect pageRect = CGRectMake(, , , );
      // This code block sets up our PDF Context so that we can draw to it
 
     CGContextRef pdfContext;
     CFStringRef path;
     CFURLRef url;
     CFMutableDictionaryRef myDictionary = NULL;
     // Create a CFString from the filename we provide to this method when we call it
     path = CFStringCreateWithCString (NULL, filename, kCFStringEncodingUTF8);
     // Create a CFURL using the CFString we just defined
     url = CFURLCreateWithFileSystemPath (NULL, path, kCFURLPOSIXPathStyle, );
     CFRelease (path);
     // This dictionary contains extra options mostly for ‘signing’ the PDF
     myDictionary = CFDictionaryCreateMutable(NULL, , &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
     CFDictionarySetValue(myDictionary, kCGPDFContextTitle, CFSTR("My PDF File"));
     CFDictionarySetValue(myDictionary, kCGPDFContextCreator, CFSTR("My Name"));
     // Create our PDF Context with the CFURL, the CGRect we provide, and the above defined dictionary
     pdfContext = CGPDFContextCreateWithURL (url, &pageRect, myDictionary);
     // Cleanup our mess
     CFRelease(myDictionary);
     CFRelease(url);
 
     // Done creating our PDF Context, now it’s time to draw to it
     // Starts our first page
     CGContextBeginPage (pdfContext, &pageRect);
 
     UIImage* myUIImage = img;
     CGImageRef pageImage = [myUIImage CGImage];
     CGContextDrawImage(pdfContext, CGRectMake(,,([myUIImage size].width) , ([myUIImage size].height)), pageImage); //绘制图片
     // Draws a black rectangle around the page inset by 50 on all sides
 //    CGContextStrokeRect(pdfContext, CGRectMake(50, 50, pageRect.size.width - 100, pageRect.size.height - 100));
 
     // Adding some text on top of the image we just added
 //    CGContextSelectFont (pdfContext, "Helvetica", 30, kCGEncodingMacRoman);
     CGContextSetTextDrawingMode (pdfContext, kCGTextFill);
     CGContextSetRGBFillColor (pdfContext, , , , );
 
     UIGraphicsPushContext(pdfContext);  //将需要绘制的层push
     CGContextTranslateCTM(pdfContext, , );  //转换Y轴坐标,  底层坐标与cocoa 组件不同 Y轴相反
     CGContextScaleCTM(pdfContext, , -);
 
 //    CGContextShowTextAtPoint (pdfContext, 260, 390, [text UTF8String], strlen([text UTF8String])); //汉字不正常
 
     [text drawAtPoint:CGPointMake(, ) withFont:[UIFont systemFontOfSize:]];  //绘制汉字
 
 //    UIFont *font = [UIFont systemFontOfSize:15 ]; //自定义字体
 //    CGContextSetFillColorWithColor(pdfContext, [UIColor blackColor].CGColor); //颜色
 //    [text drawAtPoint:CGPointMake(260,390) forWidth:50 withFont:font minFontSize:8 actualFontSize:NULL lineBreakMode:UILineBreakModeTailTruncation baselineAdjustment:UIBaselineAdjustmentAlignCenters];
 
     UIGraphicsPopContext(); 
 
     CGContextStrokePath(pdfContext);
 
     // End text
     // We are done drawing to this page, let’s end it
     // We could add as many pages as we wanted using CGContextBeginPage/CGContextEndPage
     CGContextEndPage (pdfContext);
     // We are done with our context now, so we release it
     CGContextRelease (pdfContext);
 }
 
 - (void)viewDidLoad
 {
     [super viewDidLoad];
     // Do any additional setup after loading the view, typically from a nib.
 
     //调用方法
     [self createPdf:[UIImage imageNamed:@"aa"] andText:@"汉字"];
 
 }

转自：http://www.cppblog.com/Khan/archive/2013/03/18/198566.html