I have an app that allows users to sign a contract. The contract has 3 boxes that need to be autofilled with prices. The PDF will then need to be printed and emailed.
I already have created a view that allows for signature capture. It works by taking an CGImage of the view after the user signs (obviously there is more to it than that).
I can't seem to figure out 2 things:
How to autofill the boxes with prices
Embed the signature image with the PDF for printing.
Any help would be much appreciated and as always, thank you for your time.
Code to draw PDF file
if(document) {
CGPDFPageRef page = CGPDFDocumentGetPage(document, currentPage);
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSaveGState(ctx);
CGContextTranslateCTM(ctx, 0.0, [self bounds].size.height);
CGContextScaleCTM(ctx, 1.0, -1.0);
CGContextConcatCTM(ctx, CGPDFPageGetDrawingTransform(page, kCGPDFCropBox, [self bounds], 0, true));
CGContextDrawPDFPage(ctx, page);
CGContextRestoreGState(ctx);
}
Related
I have been attempting this for a few days now. I'm creating a sprite sheet loader, however I must also be able to load the sprites facing the opposite direction. This involves flipping the images that I already have loaded.
I have already attempted to do this using the UIImageOrientation / UIImageOrientationUpMirrored method however this has absolutely no effect and simply draws the frame with the exact same orientation as before.
I have since attempted a slightly more complicated way which I will include below. But still, simply draws the image in exactly the same way as it is loaded into the application. (Not mirrored).
I've included the method below (along with my comments so that you can maybe follow my thought pattern), can you see what I am doing wrong?
- (UIImage*) getFlippedFrame:(UIImage*) imageToFlip
{
//create a context to draw that shizz into
UIGraphicsBeginImageContext(imageToFlip.size);
CGContextRef currentContext = UIGraphicsGetCurrentContext();
//WHERE YOU LEFT OFF. you're attempting to find a way to flip the image in imagetoflip. and return it as a new UIimage. But no luck so far.
[imageToFlip drawInRect:CGRectMake(0, 0, imageToFlip.size.width, imageToFlip.size.height)];
//take the current context with the old frame drawn in and flip it.
CGContextScaleCTM(currentContext, -1.0, 1.0);
//create a UIImage made from the flipped context. However will the transformation survive the transition to UIImage? UPDATE: Apparently not.
UIImage* flippedFrame = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return flippedFrame;
}
Thank you,
Guy.
I would have expected that you have to change the transform of the context and then draw. Also, you would need to translate because you are flipping to negative coordinates, so, replace
[imageToFlip drawInRect:CGRectMake(0, 0, imageToFlip.size.width, imageToFlip.size.height)];
CGContextScaleCTM(currentContext, -1.0, 1.0);
with (edited based on comments)
CGContextTranslateCTM(currentContext, imageToFlip.size.width, 0);
CGContextScaleCTM(currentContext, -1.0, 1.0);
[imageToFlip drawInRect:CGRectMake(0, 0, imageToFlip.size.width, imageToFlip.size.height)];
NOTE: From comments, a category to use
#implementation UIImage (Flip)
- (UIImage*)horizontalFlip {
UIGraphicsBeginImageContext(self.size);
CGContextRef current_context = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(current_context, self.size.width, 0);
CGContextScaleCTM(current_context, -1.0, 1.0);
[self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)];
UIImage *flipped_img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return flipped_img;
}
#end
In my app I have a method that draws a pdf into a context:
CGPDFPageRef page = CGPDFDocumentGetPage(pdf, index + 1);
CGAffineTransform transform = aspectFit(CGPDFPageGetBoxRect(page, kCGPDFTrimBox),
CGContextGetClipBoundingBox(ctx));
CGContextConcatCTM(ctx, transform);
CGContextDrawPDFPage(ctx, page);
Now in drawLayer, that is called when zooming, I do the necessary transformations and call again CGContextDrawPDFPage(ctx, page);
What happens is that a zoomed pdf is drawn on top of the first pdf, the problem is that in a particular page with only text, the back and blurred pdf is shown. That is strange, I thought that pdf page had white background and if this happens it's because the zoomed pdf on top has transparent background.
Now, to solve this how can I clear the context right before the CGContextDrawPDFPage(ctx, page) of drawLayer method? I tried:
//self.view.transform = CGAffineTransformIdentity;
//CGAffineTransform transform = CGAffineTransformIdentity;
//CGContextConcatCTM(ctx, transform);
//CGContextClearRect(ctx, layer.bounds);
Nothing works...thanks in advance
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextClearRect(context, self.bounds);
Did you try to flush the context as below?
CGContextFlush(ctx);
I am having some trouble with saving a PDF page as UIImage...the pdf is loaded from the internet and it has one page(original PDF has been splitted in sever)...but the converted image sometimes is cropped...sometimes it is small and leave white space when it is putted on UIImageview...
here is the code
-(UIImage *)imageFromPdf:(NSString *) pdfUrl{
NSURL *pdfUrlStr=[NSURL URLWithString:pdfUrl];
CFURLRef docURLRef=(CFURLRef)pdfUrlStr;
UIGraphicsBeginImageContext(CGSizeMake(768, 1024)); //840, 960
NSLog(#"save begin");
CGContextRef context = UIGraphicsGetCurrentContext();
//CFURLRef pdfURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(), CFSTR("/file.pdf"), NULL, NULL);
CGPDFDocumentRef pdf = CGPDFDocumentCreateWithURL(docURLRef);
NSLog(#"save complete");
CGContextTranslateCTM(context, 0.0, 900);//320
CGContextScaleCTM(context, 1.0, -1.0);
CGPDFPageRef page = CGPDFDocumentGetPage(pdf, 1);
CGContextSaveGState(context);
CGAffineTransform pdfTransform = CGPDFPageGetDrawingTransform(page, kCGPDFCropBox, CGRectMake(0, 0, 768, 1024), 0, true);
CGContextConcatCTM(context, pdfTransform);
CGContextDrawPDFPage(context, page);
CGContextRestoreGState(context);
UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return resultingImage;
}
btw I have prepared my UIImageview by coding like this
self.PDFImageVIew.contentMode = UIViewContentModeScaleAspectFit;
self.PDFImageVIew.clipsToBounds = YES;
I just want this image perfectly fitted on UIImageview and may be its reducing the quality of image...can you have suggesion how can I keep the quality also? please help and give me some suggestion
thanks
CGContextTranslateCTM(context, 0.0, 900);//320
Here generally last parameter of translate operation should be the height of context or height of rectangle for which you creating image. So, i think it should be 1024(You have taken height of image context is 1024 so here i am assuming that status bar is not present). This may eliminate the issue of cropping. Some more things that i have noted on your code you should have to save the state of graphics before any operation on context. You have are saving it but after few operations.
Above code will try to make it height fit so if height of actual page is bigger than your context height then it will be scaled down. so you can obviously see white space around page.
One more thing if your original pdf page have white space in it then there is no way to eliminate it as far as i know.
I am just starting to build an app that will display PDF documents. I've been experimenting, subclassing UIView and using the code from Apples demo. I have a PDF document that contains an image that is 1024 x 748 pixels at 131 ppi, so that it SHOULD fill the iPad screen in landscape view.
When I run the app the pdf is scaled to approximately .25% of its full size, centered in the iPad screen. Why isn't the PDF being displayed full sized?
Code from my custom UIView:
-(id)initWithFrame:(CGRect)frame PDFName:(NSString *)pdfName
{
self = [super initWithFrame:frame];
if(self != nil)
{
self.backgroundColor = [UIColor blueColor];
self.opaque = YES;
self.clearsContextBeforeDrawing = YES;
CFURLRef pdfURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(), (CFStringRef)pdfName, NULL, NULL);
pdf = CGPDFDocumentCreateWithURL((CFURLRef)pdfURL);
CFRelease(pdfURL);
}
return self;
}
- (void)drawRect:(CGRect)rect {
// PDF page drawing expects a Lower-Left coordinate system, so we flip the coordinate system
// before we start drawing.
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(context, 0.0, self.bounds.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
// Grab the first PDF page
CGPDFPageRef page = CGPDFDocumentGetPage(pdf, 1);
// We're about to modify the context CTM to draw the PDF page where we want it, so save the graphics state in case we want to do more drawing
CGContextSaveGState(context);
// CGPDFPageGetDrawingTransform provides an easy way to get the transform for a PDF page. It will scale down to fit, including any
// base rotations necessary to display the PDF page correctly.
CGAffineTransform pdfTransform = CGPDFPageGetDrawingTransform(page, kCGPDFMediaBox, self.bounds, 0, true);
// And apply the transform.
CGContextConcatCTM(context, pdfTransform);
// Finally, we draw the page and restore the graphics state for further manipulations!
CGContextDrawPDFPage(context, page);
CGContextRestoreGState(context);
}
Answer was easy. Changed the ppi of the image in the PDF to 72 ppi (still 1024 x 748). Now it fills the screen correctly. I thought that I needed to match the iPads pixel density, but I guess not.
Jk
I have managed to implement a very basic PDF viewer within my application, but was wondering if it was possible to add annotations to the PDF. I have looked through the SDK docs, but not found anything. I have 2 questions really:
Is it possible to do this?
What is the best approach to take?
Is there a framework or library that I can include to assist with this?
Thanks.
You can do annotation by reading in a PDF page, drawing it onto a new PDF graphics context, then drawing extra content onto that graphic context. Here is some code that adds the words 'Example annotation' at position (100.0,100.0) to an existing PDF. The method getPDFFileName returns the path of the original PD. getTempPDFFileName returns the path of the new PDF, the one that is the original plus the annotation.
To vary the annotations, just add in more drawing code in place of the drawInRect:withFont: method. See the Drawing and Printing Guide for iOS for more on how to do that.
- (void) exampleAnnotation;
{
NSURL* url = [NSURL fileURLWithPath:[self getPDFFileName]];
CGPDFDocumentRef document = CGPDFDocumentCreateWithURL ((CFURLRef) url);// 2
size_t count = CGPDFDocumentGetNumberOfPages (document);// 3
if (count == 0)
{
NSLog(#"PDF needs at least one page");
return;
}
CGRect paperSize = CGRectMake(0.0,0.0,595.28,841.89);
UIGraphicsBeginPDFContextToFile([self getTempPDFFileName], paperSize, nil);
UIGraphicsBeginPDFPageWithInfo(paperSize, nil);
CGContextRef currentContext = UIGraphicsGetCurrentContext();
// flip context so page is right way up
CGContextTranslateCTM(currentContext, 0, paperSize.size.height);
CGContextScaleCTM(currentContext, 1.0, -1.0);
CGPDFPageRef page = CGPDFDocumentGetPage (document, 1); // grab page 1 of the PDF
CGContextDrawPDFPage (currentContext, page); // draw page 1 into graphics context
// flip context so annotations are right way up
CGContextScaleCTM(currentContext, 1.0, -1.0);
CGContextTranslateCTM(currentContext, 0, -paperSize.size.height);
[#"Example annotation" drawInRect:CGRectMake(100.0, 100.0, 200.0, 40.0) withFont:[UIFont systemFontOfSize:18.0]];
UIGraphicsEndPDFContext();
CGPDFDocumentRelease (document);
}
I am working in the stuff and created a GitHub project. Please check it out here.
I don't think PDFAnnotation or PDFKit were ported to iPhone from the desktop.... probably a great excuse to file a radar. However, Haru may get you by in the meantime.