我正在努力处理一段简单的代码，我花了很多时间搜索这个，检查论坛并尝试了不同的东西。我几乎在那里，但并不完全。基本上我需要将UITableView的内容转换为PDF 。
我在下面的代码似乎工作得很好，除了用户有将表格刷到它的内容的末尾，如果不是那个部分将不会被渲染。我以编程方式滚动了UITableView，但这似乎并没有成功。我越来越多地进入Quartz2D以进一步理解这些东西，但客户需要这个固定的昨天:-)
-(void) createPDFfromUITable:(UIView*)aView saveToDocumentsWithFileName:(NSString*)aFilename
{
CGRect priorBounds = self.tableView.bounds;
CGSize fittedSize = [self.tableView sizeThatFits:CGSizeMake(priorBounds.size.width,3000)];
self.tableView.bounds = CGRectMake(0, 0, fittedSize.width,1800);
CGRect pdfPageBounds = CGRectMake(0, 0,self.view.bounds.size.width,792);
NSMutableData *pdfData = [[NSMutableData alloc] init];
UIGraphicsBeginPDFContextToData(pdfData, pdfPageBounds, nil);
CGFloat pageOriginY=0;
for(int i=0;i<2;i++)//for (CGFloat pageOriginY = 0; pageOriginY < fittedSize.height; pageOriginY += pdfPageBounds.size.height)
{
UIGraphicsBeginPDFPageWithInfo(pdfPageBounds, nil);
CGContextSaveGState(UIGraphicsGetCurrentContext());
{
CGContextTranslateCTM(UIGraphicsGetCurrentContext(), 0, -pageOriginY);
[self.tableView.layer renderInContext:UIGraphicsGetCurrentContext()];
[self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:([_resultados count]-1)] atScrollPosition:UITableViewScrollPositionTop animated:NO];
CGContextTranslateCTM(UIGraphicsGetCurrentContext(), 0, -pageOriginY);
} CGContextRestoreGState(UIGraphicsGetCurrentContext());
pageOriginY += pdfPageBounds.size.height;
}
UIGraphicsEndPDFContext();
self.tableView.bounds = priorBounds; // Reset the tableView
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0];
NSString *filePathPDF = [documentsPath stringByAppendingPathComponent:aFilename];
[pdfData writeToFile:filePathPDF atomically:YES];
[self showEmail:filePathPDF];
}
如果您有修复我现在使用的代码的建议，那么您碰巧有一整个代码片段可以完成整个事情，非常感谢。
答案 0 :(得分：1)
我遇到了类似的情况，我想导出用户输入的数据，以生成包含该信息的pdf报告。
经过数天的研究，我发现截图UITableView不是一个好习惯。
我建议使用CoreText来绘制自己的。{1}}。以下是执行绘图的辅助方法。
+(void)drawText:(NSString*)textToDraw withFont:(UIFont *)font inFrame:(CGRect)frameRect
{
if (textToDraw) {
// create attributed string
CFMutableAttributedStringRef attrStr = CFAttributedStringCreateMutable(kCFAllocatorDefault, 0);
CFAttributedStringReplaceString (attrStr, CFRangeMake(0, 0), (CFStringRef) textToDraw);
// create font
if (!font) {
font = [UIFont fontWithName:@"TimesNewRomanPSMT" size:12];
}
CFStringRef fontString = (__bridge CFStringRef)font.fontName;
CTFontRef fontRef = CTFontCreateWithName(fontString, font.pointSize, NULL);
// create paragraph style and assign text alignment to it
CTTextAlignment alignment = kCTTextAlignmentLeft;
CTParagraphStyleSetting _settings[] = { {kCTParagraphStyleSpecifierAlignment, sizeof(alignment), &alignment} };
CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(_settings, sizeof(_settings) / sizeof(_settings[0]));
// set paragraph style attribute
CFAttributedStringSetAttribute(attrStr, CFRangeMake(0, CFAttributedStringGetLength(attrStr)), kCTParagraphStyleAttributeName, paragraphStyle);
// set font attribute
CFAttributedStringSetAttribute(attrStr, CFRangeMake(0, CFAttributedStringGetLength(attrStr)), kCTFontAttributeName, fontRef);
// release paragraph style and font
CFRelease(paragraphStyle);
CFRelease(fontRef);
// Prepare the text using a Core Text Framesetter
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString(attrStr);
CGMutablePathRef framePath = CGPathCreateMutable();
CGPathAddRect(framePath, NULL, frameRect);
// Get the frame that will do the rendering.
CFRange currentRange = CFRangeMake(0, 0);
CTFrameRef frameRef = CTFramesetterCreateFrame(framesetter, currentRange, framePath, NULL);
CGPathRelease(framePath);
// Get the graphics context.
CGContextRef currentContext = UIGraphicsGetCurrentContext();
// Put the text matrix into a known state. This ensures
// that no old scaling factors are left in place.
CGContextSetTextMatrix(currentContext, CGAffineTransformIdentity);
// Core Text draws from the bottom-left corner up, so flip
// the current transform prior to drawing.
CGContextTranslateCTM(currentContext, 0, frameRect.origin.y*2);
CGContextScaleCTM(currentContext, 1.0, -1.0);
// Draw the frame.
CTFrameDraw(frameRef, currentContext);
CGContextScaleCTM(currentContext, 1.0, -1.0);
CGContextTranslateCTM(currentContext, 0, (-1)*frameRect.origin.y*2);
}
}
+(void)drawLineFromPoint:(CGPoint)from toPoint:(CGPoint)to
{
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(context, 1.0);
CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();
CGColorRef color = [UIColor colorWithWhite:0.0 alpha:1.0].CGColor;
CGContextSetStrokeColorWithColor(context, color);
CGContextMoveToPoint(context, from.x, from.y);
CGContextAddLineToPoint(context, to.x, to.y);
CGContextStrokePath(context);
CGColorSpaceRelease(colorspace);
}
+(void)drawTableAt:(CGPoint)origin
withRowHeight:(int)rowHeight
andColumnWidth:(int)columnWidth
andRowCount:(int)numberOfRows
andColumnCount:(int)numberOfColumns
{
for (int i = 0; i <= numberOfRows; i++) {
int newOrigin = origin.y + (rowHeight*i);
CGPoint from = CGPointMake(origin.x, newOrigin);
CGPoint to = CGPointMake(origin.x + (numberOfColumns*columnWidth), newOrigin);
[self drawLineFromPoint:from toPoint:to];
}
for (int i = 0; i <= numberOfColumns; i++) {
int newOrigin = origin.x + (columnWidth*i);
CGPoint from = CGPointMake(newOrigin, origin.y);
CGPoint to = CGPointMake(newOrigin, origin.y +(numberOfRows*rowHeight));
[self drawLineFromPoint:from toPoint:to];
}
}
所以你的代码将是这样的：
// Draw first page
CGRect pageFrame = CGRectMake(0, 0, 612.0, 792.0);
UIGraphicsBeginPDFPageWithInfo(pageFrame, nil);
CGContextScaleCTM(UIGraphicsGetCurrentContext(),pageFrame.size.width/screenSize.width, pageFrame.size.height/screenSize.height);
[self doTheDrawing];
UIGraphicsEndPDFContext();