Creating PDF from UIScrollView in iphone app - iphone

Question

I am creating pdf from UIView to pdf it works fine but i have scrollView with content which i want to convert to pdf but it only show visible part in pdf not the whole scrollView content. here is my code
-(void)createPDFfromUIView:(UIView*)aView saveToDocumentsWithFileName:(NSString*)aFilename
{
NSMutableData *pdfData = [NSMutableData data];
// Get Scrollview size
CGRect scrollSize = CGRectMake(1018,76,scrollView.contentSize.width,scrollView.contentSize.height);
// Points the pdf converter to the mutable data object and to the UIView to be converted
UIGraphicsBeginPDFContextToData(pdfData, scrollSize, nil);
UIGraphicsBeginPDFPage();
CGContextRef pdfContext = UIGraphicsGetCurrentContext();
// draws rect to the view and thus this is captured by UIGraphicsBeginPDFContextToData
[aView.layer renderInContext:pdfContext];
// remove PDF rendering context
UIGraphicsEndPDFContext();
// Retrieves the document directories from the iOS device
NSArray* documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);
NSString* documentDirectory = [documentDirectories objectAtIndex:0];
NSString* documentDirectoryFilename = [documentDirectory stringByAppendingPathComponent:aFilename];
// instructs the mutable data object to write its context to a file on disk
[pdfData writeToFile:documentDirectoryFilename atomically:YES];
NSLog(#"documentDirectoryFileName: %#",documentDirectoryFilename);
}

Answer 1

THis gives you the visible portion of the UIScrollView
CGRect visibleRect;
visibleRect.origin = scrollView.contentOffset;
visibleRect.size = scrollView.bounds.size;
float theScale = 1.0 / scale;
visibleRect.origin.x *= theScale;
visibleRect.origin.y *= theScale;
visibleRect.size.width *= theScale;
visibleRect.size.height *= theScale;
so you can use this in UIGraphicsBeginPDFContextToData(pdfData, aView.bounds, nil);
by some minor changes in the parameters.

Answer 2

(void)createPDFfromUIView:(UIScrollView*)aView saveToDocumentsWithFileName:(NSString*)aFilename
{
// Creates a mutable data object for updating with binary data, like a byte array
NSMutableData *pdfData = [NSMutableData data];
// Get Scrollview size
CGRect scrollSize = CGRectMake(aView.origin.x,aView.origin.y,aView.contentSize.width,aView.contentSize.height);
// Points the pdf converter to the mutable data object and to the UIView to be converted
UIGraphicsBeginPDFContextToData(pdfData, scrollSize, nil);
UIGraphicsBeginPDFPage();
CGContextRef pdfContext = UIGraphicsGetCurrentContext();
// draws rect to the view and thus this is captured by UIGraphicsBeginPDFContextToData
[aView.layer renderInContext:pdfContext];
// remove PDF rendering context
UIGraphicsEndPDFContext();
// Retrieves the document directories from the iOS device
NSArray* documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);
NSString* documentDirectory = [documentDirectories objectAtIndex:0];
NSString* documentDirectoryFilename = [documentDirectory stringByAppendingPathComponent:aFilename];
// instructs the mutable data object to write its context to a file on disk
[pdfData writeToFile:documentDirectoryFilename atomically:YES];
NSLog(#"documentDirectoryFileName: %#",documentDirectoryFilename);
}

Answer 3

This code i used to make pdf from uiscrollview and it does help but it will not be as good as if we draw on pdf -- please have look -- Pdf from UIScrollView
- (void) createPDF
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *directroyPath = nil;
directroyPath = [documentsDirectory stringByAppendingPathComponent:#"temp"];
NSString *filePath = [directroyPath stringByAppendingPathComponent:#"test.pdf"];
// check for the "PDF" directory
NSError *error;
if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
} else {
[[NSFileManager defaultManager] createDirectoryAtPath:directroyPath
withIntermediateDirectories:NO
attributes:nil
error:&error];
}
CGContextRef pdfContext = [self createPDFContext:_scrollView2.bounds path:(CFStringRef)filePath];
NSLog(#"PDF Context created");
/*
Here limit of i is no of pages in your uiscrollview or
you can use hit and trial here because there is a
length of page is going to be equal to
the visible size of uiscrollView in your application
*/
for (int i = 0 ; i< 2 ; i++)
{
// page 1
CGContextBeginPage (pdfContext,nil);
//turn PDF upsidedown
CGAffineTransform transform = CGAffineTransformIdentity;
//here 365 is equal to the height of myScrollView.frame.size.height
transform = CGAffineTransformMakeTranslation(0, (i+1) * 365);
transform = CGAffineTransformScale(transform, 1.0, -1.0);
CGContextConcatCTM(pdfContext, transform);
//Draw view into PDF
[_scrollView2.layer renderInContext:pdfContext];
CGContextEndPage (pdfContext);
[_scrollView2 setContentOffset:CGPointMake(0, (i+1) * 365) animated:NO];
}
CGContextRelease (pdfContext);
}
- (CGContextRef) createPDFContext:(CGRect)inMediaBox path:(CFStringRef) path
{
CGContextRef myOutContext = NULL;
CFURLRef url;
url = CFURLCreateWithFileSystemPath (NULL, path,
kCFURLPOSIXPathStyle,
false);
if (url != NULL) {
myOutContext = CGPDFContextCreateWithURL (url,
&inMediaBox,
NULL);
CFRelease(url);
}
return myOutContext;
}

Answer 4

The easiest way to convert the scrollview content into a PDF file is to have a content view as the first subview of the scrollview and using that view to take a snapshot of the scrollview. The code in Swift would look like this:
func generatePDFdata(withView view: UIView) -> NSData {
let pageDimensions = view.bounds
let outputData = NSMutableData()
UIGraphicsBeginPDFContextToData(outputData, pageDimensions, nil)
if let context = UIGraphicsGetCurrentContext() {
UIGraphicsBeginPDFPage()
view.layer.render(in: context)
}
UIGraphicsEndPDFContext()
return outputData
}
You can then use the outputData to write into a PDF file:
outputData.write(to: pdfFileUrl, atomically: true)