如何从textView制作多页PDF？
我从我的iPhone应用程序生成一个PDF文件，而大多数文件只有一个页面，我希望能够检测文本是否要走出“边缘”，如果是的话，将其添加到下一页。 我是新来的，所以不太确定如何做到这一点。
下面是代码。 有什么build议么？
- (void) drawBorder { CGContextRef currentContext = UIGraphicsGetCurrentContext(); UIColor *borderColor = [UIColor grayColor]; CGRect rectFrame = CGRectMake(kBorderInset, kBorderInset, pageSize.width-kBorderInset*2, pageSize.height-kBorderInset*2); CGContextSetStrokeColorWithColor(currentContext, borderColor.CGColor); CGContextSetLineWidth(currentContext, kBorderWidth); CGContextStrokeRect(currentContext, rectFrame); } - (void)drawPageNumber:(NSInteger)pageNumber { NSString* pageNumberString = [NSString stringWithFormat:@"Page %d", pageNumber]; UIFont* theFont = [UIFont systemFontOfSize:12]; CGSize pageNumberStringSize = [pageNumberString sizeWithFont:theFont constrainedToSize:pageSize lineBreakMode:UILineBreakModeWordWrap]; CGRect stringRenderingRect = CGRectMake(kBorderInset, pageSize.height - 40.0, pageSize.width - 2*kBorderInset, pageNumberStringSize.height); [pageNumberString drawInRect:stringRenderingRect withFont:theFont lineBreakMode:UILineBreakModeWordWrap alignment:UITextAlignmentCenter]; } - (void) drawHeader:(NSString *)header { CGContextRef currentContext = UIGraphicsGetCurrentContext(); CGContextSetRGBFillColor(currentContext, 0.0, 0.0, 0.0, 1.0); NSString *textToDraw = header; UIFont *font = [UIFont systemFontOfSize:24.0]; CGSize stringSize = [textToDraw sizeWithFont:font constrainedToSize:CGSizeMake(pageSize.width - 2*kBorderInset-2*kMarginInset, pageSize.height - 2*kBorderInset - 2*kMarginInset) lineBreakMode:UILineBreakModeWordWrap]; CGRect renderingRect = CGRectMake(kBorderInset + kMarginInset, kBorderInset + kMarginInset, pageSize.width - 2*kBorderInset - 2*kMarginInset, stringSize.height); [textToDraw drawInRect:renderingRect withFont:font lineBreakMode:UILineBreakModeWordWrap alignment:UITextAlignmentLeft]; } - (void) drawText:(NSString *)bodyText { CGContextRef currentContext = UIGraphicsGetCurrentContext(); CGContextSetRGBFillColor(currentContext, 0.0, 0.0, 0.0, 1.0); NSString *textToDraw = bodyText; UIFont *font = [UIFont systemFontOfSize:14.0]; CGSize stringSize = [textToDraw sizeWithFont:font constrainedToSize:CGSizeMake(pageSize.width - 2*kBorderInset-2*kMarginInset, pageSize.height - 2*kBorderInset - 2*kMarginInset) lineBreakMode:UILineBreakModeWordWrap]; CGRect renderingRect = CGRectMake(kBorderInset + kMarginInset, kBorderInset + kMarginInset + 50.0, pageSize.width - 2*kBorderInset - 2*kMarginInset, stringSize.height); [textToDraw drawInRect:renderingRect withFont:font lineBreakMode:UILineBreakModeWordWrap alignment:UITextAlignmentLeft]; } - (void) drawLine { CGContextRef currentContext = UIGraphicsGetCurrentContext(); CGContextSetLineWidth(currentContext, kLineWidth); CGContextSetStrokeColorWithColor(currentContext, [UIColor blackColor].CGColor); CGPoint startPoint = CGPointMake(kMarginInset + kBorderInset, kMarginInset + kBorderInset + 40.0); CGPoint endPoint = CGPointMake(pageSize.width - 2*kMarginInset -2*kBorderInset, kMarginInset + kBorderInset + 40.0); CGContextBeginPath(currentContext); CGContextMoveToPoint(currentContext, startPoint.x, startPoint.y); CGContextAddLineToPoint(currentContext, endPoint.x, endPoint.y); CGContextClosePath(currentContext); CGContextDrawPath(currentContext, kCGPathFillStroke); } - (void) drawImage:(UIImage *)image { //UIImage * demoImage = [UIImage imageNamed:@"demo.png"]; [image drawInRect:CGRectMake( (pageSize.width - image.size.width/2)/2, 350, image.size.width/2, image.size.height/2)]; } - (void) generatePdf: (NSString *)thefilePath :(NSString *) theHeader :(NSString *) theText :(UIImage *) theImage { pageSize = CGSizeMake(612, 792); UIGraphicsBeginPDFContextToFile(thefilePath, CGRectZero, nil); NSInteger currentPage = 0; BOOL done = NO; do { //Start a new page. UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, pageSize.width, pageSize.height), nil); //Draw a page number at the bottom of each page. currentPage++; [self drawPageNumber:currentPage]; //Draw a border for each page. [self drawBorder]; //Draw text fo our header. [self drawHeader:theHeader]; //Draw a line below the header. [self drawLine]; //Draw some text for the page. [self drawText:theText]; //Draw an image [self drawImage:theImage]; done = YES; } while (!done); // Close the PDF context and write the contents out. UIGraphicsEndPDFContext(); } #pragma mark - View lifecycle - (void)viewDidLoad { [super viewDidLoad]; } - (void)viewDidUnload { [super viewDidUnload]; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationPortrait); } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; } - (IBAction)generatePdfWithFileName:(id)sender { pageSize = CGSizeMake(612, 792); NSString *fileName = @"test.pdf"; NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString *pdfFileName = [documentsDirectory stringByAppendingPathComponent:fileName]; NSString *header = @"This is the bad ass header section!"; NSString *text = @"There is so much to say here I don't know where to begin...."; [self generatePdf : pdfFileName : header:text:nil]; } @end 这个概念可以在这里看到
[来自http://spitzkoff.com/craig/?p=160%5D
放置物品时，获取高度：
CGSize size = [name sizeWithFont:studentNameFont forWidth:maxWidth lineBreakMode:UILineBreakModeWordWrap]; [name drawAtPoint:CGPointMake(kMargin, currentPageY) forWidth:maxWidth withFont:studentNameFont lineBreakMode:UILineBreakModeWordWrap]; currentPageY += size.height;
在适当的地方，检查currentY并决定是否需要移动到一个新的页面：
if (size.height + currentPageY > maxHeight) { // create a new page and reset the current page's Y value UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, kDefaultPageWidth, kDefaultPageHeight), nil); currentPageY = kMargin; }
我希望有帮助。
我是新来的stackoverflow，但我想build议一个简短的答案“打破部分长文本视图”的问题。
我使用的方法当然不是将文本分解成多个部分的最有效的方式，但是这是我find的唯一方法。 拿一部分文本，我只是在一个循环中检查，如果子文本适合我的页面，意思是允许的高度，一个一个地画。 如果整个文本不合适，那么我的代码将只绘制find的部分。 例如，我可以把一个长文本分成四页，至less。 对不起，我缺乏经验，如果我的答案只是一瞥，“如何”的想法还不够清楚。
澄清我的答案。 我添加了我用来检查“子文本”所需的高度（find）的方法（每次用添加到“子文本”的单词检查）。 因为“sizeWithFont：”自IOS 7以来已被弃用，所以我使用“boundingRectWithSize：”方法。
// Process, that can take long though, to find the next start of the part of a text that hasn't been drawned yet. float widthRect; widthRect = pageWidth - 2 * leftMargin; - (unsigned int) findNextStartingPos:(NSString *)text withHeight:(float) height { NSString *character; unsigned int pos = 0; unsigned int posFound = 0; unsigned int lastPosFound = 0; BOOL found = NO; NSString *textTest; float heightFound; while (pos <= [text length]-1) { character = [text substringWithRange:NSMakeRange(pos, 1)]; if ([character isEqualToString:@" "] || [character isEqualToString:@"\n"]) { posFound = pos; found = YES; } if (found) { textTest = [text substringWithRange:NSMakeRange(0, posFound)]; heightFound = lroundf([self heightFound:textTest withWidth:widthRect fontSize:fontSizeBody center:NO]); if (heightFound > height) { if (lastPosFound == 0) { posFound = lastPosFound; } else { posFound = lastPosFound + 1; } if (posFound > [text length]-1) posFound = lastPosFound; break; } lastPosFound = posFound; } pos++; } return posFound; } return posFound; } // Returns the height needed to draw a text (and to check for space in a page) -(float) heightFound:(NSString *)text withWidth:(float)width fontSize:(CGFloat)fontSize center:(BOOL)center { if ([text length] != 0) { UIFont *font = [UIFont fontWithName:@"Helvetica" size:fontSize]; NSMutableParagraphStyle *paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy]; paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping; if (center) { paragraphStyle.alignment = NSTextAlignmentCenter; } else { paragraphStyle.alignment = NSTextAlignmentLeft; } NSDictionary *attributes = @{NSFontAttributeName:font, NSParagraphStyleAttributeName: paragraphStyle}; NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:text attributes:attributes]; CGRect newRect = [attributedString boundingRectWithSize:(CGSize){width, CGFLOAT_MAX} options:NSStringDrawingUsesLineFragmentOrigin context:nil]; return newRect.size.height; } else { return 0; } }