直接从Ipad中的UiTextView创建多页PDF
问题描述：
我已经创建了具有特定布局的pdf文件.问题是，当文本视图的内容很长时，Pdf将不会自动生成新页面，并且我无法预定义在运行时将创建多少个页面.谁能帮我吗?
I have created pdf with specific layout. The problem is that When the contents of text view is very long, Pdf will not automatically generate new page and I can not predefine how many pages will be created at run time. Can anyone please help me?
答
您可以尝试使用以下代码，这可能会对您有所帮助 在界面"构建器中保留一个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
You can try by using this code this may help you Keep a textview and a button in Interface builder and use the button action method and generate pdf import these frameworks
#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];
}