objective-c - 在 Ipad 中直接从 UiTextView 创建多页 PDF

Question

我已经创建了具有特定布局的 pdf。问题是当 TextView 的内容很长时，Pdf 不会自动生成新页面，我无法预定义在运行时将创建多少页面。谁能帮帮我？

Answer 1

您可以尝试使用此代码，这可能对您有所帮助在界面生成器中保留一个 TextView 和一个按钮，并使用按钮操作方法并生成 pdf导入这些框架

#import <QuartzCore/QuartzCore.h>
#import <CoreText/CoreText.h>



    -(NSString*)getPDFFileName
    {
        NSString* fileName = @"sample.PDF";
        NSArray *arrayPaths =
        NSSearchPathForDirectoriesInDomains(
                                            NSDocumentDirectory,
                                            NSUserDomainMask,
                                            YES);
        NSString *path = [arrayPaths objectAtIndex:0];
        NSString* pdfFileName = [path stringByAppendingPathComponent:fileName];
        return pdfFileName;

    }
    -(IBAction)PdfGeneration:(id)sender{
        // Prepare the text using a Core Text Framesetter.
        CFAttributedStringRef currentText = CFAttributedStringCreate(NULL, (__bridge CFStringRef)txtObj.text, NULL);
        if (currentText) {
                CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString(currentText);
                if (framesetter) {

                NSString *pdfFileName = [self getPDFFileName];

                // Create the PDF context using the default page size of 612 x 792.

                UIGraphicsBeginPDFContextToFile(pdfFileName, CGRectZero, nil);
                CFRange currentRange = CFRangeMake(0, 0);
                NSInteger currentPage = 0;
                BOOL done = NO;
                do {

                    UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 612, 792), nil);
                    currentPage++;
                    [self drawPageNumber:currentPage];
                    currentRange = [self renderPage:currentPage withTextRange:currentRange andFramesetter:framesetter];
                    if (currentRange.location == CFAttributedStringGetLength((CFAttributedStringRef)currentText))

                        done = YES;

                } while (!done);
                UIGraphicsEndPDFContext();
               CFRelease(framesetter);
            } else {

                NSLog(@"Could not create the framesetter needed to lay out the atrributed string.");

            }

            // Release the attributed string.

            CFRelease(currentText);

        } else {

            NSLog(@"Could not create the attributed string for the framesetter");

        }
    }
    // Use Core Text to draw the text in a frame on the page.

    - (CFRange)renderPage:(NSInteger)pageNum withTextRange:(CFRange)currentRange

           andFramesetter:(CTFramesetterRef)framesetter

    {

        // Get the graphics context.

        CGContextRef    currentContext = UIGraphicsGetCurrentContext();
        CGContextSetTextMatrix(currentContext, CGAffineTransformIdentity);
        CGRect    frameRect = CGRectMake(72, 72, 468, 648);
        CGMutablePathRef framePath = CGPathCreateMutable();
        CGPathAddRect(framePath, NULL, frameRect);
        CTFrameRef frameRef = CTFramesetterCreateFrame(framesetter, currentRange, framePath, NULL);
        CGPathRelease(framePath);
        CGContextTranslateCTM(currentContext, 0, 792);
        CGContextScaleCTM(currentContext, 1.0, -1.0);
        CTFrameDraw(frameRef, currentContext);
        currentRange = CTFrameGetVisibleStringRange(frameRef);
        currentRange.location += currentRange.length;
        currentRange.length = 0;
        CFRelease(frameRef);
        return currentRange;

    }
    - (void)drawPageNumber:(NSInteger)pageNum

    {

        NSString *pageString = [NSString stringWithFormat:@"Page %d", pageNum];
        UIFont *theFont = [UIFont systemFontOfSize:12];
        CGSize maxSize = CGSizeMake(612, 72);
        CGSize pageStringSize = [pageString sizeWithFont:theFont constrainedToSize:maxSize lineBreakMode:UILineBreakModeClip];
        CGRect stringRect = CGRectMake(((612.0 - pageStringSize.width) / 2.0),720.0 + ((72.0 - pageStringSize.height) / 2.0),pageStringSize.width,pageStringSize.height);
           [pageString drawInRect:stringRect withFont:theFont];

    }