I've been using the code below to save a specified UIScrollView as a .pdf file.
+ (NSString *) saveAsPDF:(UIScrollView *)view withName:(NSString *)filename
{
NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentDirectory = [path objectAtIndex:0];
NSString *pdfPathWithFileName = [documentDirectory stringByAppendingPathComponent:filename];
// Generate PDF
{
UIGraphicsBeginPDFContextToFile(pdfPathWithFileName, CGRectZero, nil);
UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, view.contentSize.width, view.contentSize.height), nil);
// My Draw View
{
NSArray *subviews = [view subviews];
UIView *contentView = [[UIView alloc] initWithFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.contentSize.width, view.contentSize.height)];
for (UIView *viewLoop in subviews)
{
[contentView addSubview:viewLoop];
}
CGContextRef context = UIGraphicsGetCurrentContext();
[contentView setBackgroundColor:[self colorForBlueBackground]];
[contentView.layer renderInContext:context];
for (UIView *viewLoop in [contentView subviews])
{
[viewLoop removeFromSuperview];
[view addSubview:viewLoop];
}
}
UIGraphicsEndPDFContext();
return pdfPathWithFileName;
}
}
This has been working fine for many months, but after updating to iOS 8, it has been behaving strangely. There seems to be an imaginary breakpoint on the UIGraphicsEndPDFContext() line, as if a runtime error occurred, but there is no error message that pops up on screen or in the Console pane of the Debug area. I have to hit the 'Continue Program Execution' button several times, and then the program continues to execute.
Afterwards, the file seems to be getting saved properly, but the UIScrollView on the screen gets shifted about half the screen width to the left, leaving the right half of the screen just empty space.
Does anyone know what changed in iOS 8 that is making me get these phantom breakpoints and strange UI behavior?
Related
I have this method here that takes my UIWebView and convert into a PDF and its working well. But when I print off this PDF or email it, its cut off. Its like its only generating what the size of the UIWebView that I set (which is width: 688 & height: 577) If I increase the size of the UIWebView to lets say 900 or 1024 my PDF is empty. My UIWebView is bigger than 577, but in my app, I am able to scroll.
Here is method....
-(void)webViewDidFinishLoad:(UIWebView *)webViewPDF
{
CGRect origframe = webViewPDF.frame;
NSString *heightStr = [webViewPDF stringByEvaluatingJavaScriptFromString:#"document.body.scrollHeight;"]; // Get the height of our webView
int height = [heightStr intValue];
CGFloat maxHeight = kDefaultPageHeight - 2*kMargin;
int pages = floor(height / maxHeight);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *path = [paths objectAtIndex:0];
self.pdfPath = [path stringByAppendingPathComponent:[NSString stringWithFormat:#"Purchase Order.pdf"]];
UIGraphicsBeginPDFContextToFile(self.pdfPath, CGRectZero, nil);
for (int i = 0; i < pages; i++)
{
if (maxHeight * (i+1) > height) {
CGRect f = [webViewPDF frame];
f.size.height -= (((i+1) * maxHeight) - height);
[webViewPDF setFrame: f];
}
UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, kDefaultPageWidth, kDefaultPageHeight), nil);
CGContextRef currentContext = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(currentContext, kMargin, kMargin);
[webViewPDF.layer renderInContext:currentContext];
}
UIGraphicsEndPDFContext();
[webViewPDF setFrame:origframe];
[[[webViewPDF subviews] lastObject] setContentOffset:CGPointMake(0, 0) animated:NO];
}
I hope this makes sense....Does anyone have any suggestions on how to fix this, so the PDF is not cut off?
I forgot to mention these variables:
#define kDefaultPageHeight 850
#define kDefaultPageWidth 850
#define kMargin 50
Here is my share button:
- (IBAction)Share:(id)sender {
NSData *pdfData = [NSData dataWithContentsOfFile:self.pdfPath];
UIActivityViewController * activityController = [[UIActivityViewController alloc] initWithActivityItems:#[pdfData] applicationActivities:nil];
UIPopoverController *popup = [[UIPopoverController alloc] initWithContentViewController:activityController];
[popup presentPopoverFromRect:CGRectMake(self.view.frame.size.width - 36, 60, 0, 0)inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];
}
I've done this in the past using UIPrintPageRenderer. It's a more versetile way of creating a PDF from a UIWebView, and it's been working well for me so far. I've tested this solution with Xcode 6 and iOS 8.2. Also, tried printing the resulting PDF and everything printed out fine.
When I read the OP, I did some testing with various page sizes, to see if I can get a blank PDF. There are a few key items that I identified, that could contribute to a blank PDF file. I've identified them in the code.
When webViewDidFinishLoad() gets called, the view might not be 100% loaded. A check is necessary, to see if the view is still loading. This is important, as it might be the source of your problem. If it's not, then we are good to go. There is a very important note here. Some web pages are loaded dynamically (defined in the page itself). Take youtube.com for example. The page displays almost immediately, with a "loading" screen. This will trick our web view, and it's "isLoading" property will be set to "false", while the web page is still loading content dynamically. This is a pretty rare case though, and in the general case this solution will work well. If you need to generate a PDF file from such a dynamic loading web page, you might need to move the actual generation to a different spot. Even with a dynamic loading web page, you will end up with a PDF showing the loading screen, and not an empty PDF file.
Another key aspect is setting the printableRect and pageRect. Note that those are set separately. If the printableRect is smaller than the paperRect, you will end up with some padding around the content - see code for example. Here is a link to Apple's API doc with some short descriptions for both.
The example code below adds a Category to UIPrintPageRenderer to create the actual PDF data. The code in this sample has been put together using various resources online in the past, and I wasn't able to find which ones were used to credit them properly.
#interface UIPrintPageRenderer (PDF)
- (NSData*) createPDF;
#end
#implementation UIPrintPageRenderer (PDF)
- (NSData*) createPDF
{
NSMutableData *pdfData = [NSMutableData data];
UIGraphicsBeginPDFContextToData( pdfData, self.paperRect, nil );
[self prepareForDrawingPages: NSMakeRange(0, self.numberOfPages)];
CGRect bounds = UIGraphicsGetPDFContextBounds();
for ( int i = 0 ; i < self.numberOfPages ; i++ )
{
UIGraphicsBeginPDFPage();
[self drawPageAtIndex: i inRect: bounds];
}
UIGraphicsEndPDFContext();
return pdfData;
}
#end
And here is what I have in webViewDidFinishLoad()
- (void)webViewDidFinishLoad:(UIWebView *)webViewIn {
NSLog(#"web view did finish loading");
// webViewDidFinishLoad() could get called multiple times before
// the page is 100% loaded. That's why we check if the page is still loading
if (webViewIn.isLoading)
return;
UIPrintPageRenderer *render = [[UIPrintPageRenderer alloc] init];
[render addPrintFormatter:webViewIn.viewPrintFormatter startingAtPageAtIndex:0];
// Padding is desirable, but optional
float padding = 10.0f;
// Define the printableRect and paperRect
// If the printableRect defines the printable area of the page
CGRect paperRect = CGRectMake(0, 0, PDFSize.width, PDFSize.height);
CGRect printableRect = CGRectMake(padding, padding, PDFSize.width-(padding * 2), PDFSize.height-(padding * 2));
[render setValue:[NSValue valueWithCGRect:paperRect] forKey:#"paperRect"];
[render setValue:[NSValue valueWithCGRect:printableRect] forKey:#"printableRect"];
// Call the printToPDF helper method that will do the actual PDF creation using values set above
NSData *pdfData = [render createPDF];
// Save the PDF to a file, if creating one is successful
if (pdfData) {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *path = [paths objectAtIndex:0];
NSString *pdfPath = [path stringByAppendingPathComponent:[NSString stringWithFormat:#"Purchase Order.pdf"]];
[pdfData writeToFile:pdfPath atomically:YES];
}
else
{
NSLog(#"error creating PDF");
}
}
PDFSize is defined as a constant, set to a standard A4 page size. It can be edited to meet your needs.
#define PDFSize CGSizeMake(595.2,841.8)
In order to create your PDF file in memory, you need to draw the layer of the UIWebBrowserView instance that lies underneath the UIWebView's scrollView. In order to do that, try changing your renderInContext: call the following way :
UIView* contentView = webViewPDF.scrollView.subviews.firstObject;
[contentView.layer renderInContext:currentContext];
Also, if you target iOS >= 7.0, then you can avoid using renderInContext: and use one of the snapshotViewAfterScreenUpdates:
or drawViewHierarchyInRect:afterScreenUpdates: methods.
I want to animate an image view in circular path and on click of image that image view need to change the new image. My problem is the images i allocated to the image view is not deallocated. And app receives memory warning and crashed. I surfed and tried lot of solutions for this problem but no use. In my case i need to create all ui components from Objective c class. Here am posting the code for creating image view and animation.
#autoreleasepool {
for(int i= 0 ; i < categories.count; i++)
{
NSString *categoryImage = [NSString stringWithFormat:#"%#_%ld.png",[categories objectAtIndex:i],(long)rating];
if (paginationClicked) {
if([selectedCategories containsObject:[categories objectAtIndex:i]]){
categoryImage = [NSString stringWithFormat:#"sel_%#",categoryImage];
}
}
UIImageView *imageView = [[UIImageView alloc] init];
imageView.image = [self.mySprites objectForKey:categoryImage];
imageView.contentMode = UIViewContentModeScaleAspectFit;
imageView.clipsToBounds = NO;
[imageView sizeToFit];
imageView.accessibilityHint = [categories objectAtIndex:i];
// imageView.frame = CGRectMake(location.x+sin(M_PI/2.5)*(self.view.frame.size.width*1.5),location.y+cos(M_PI/2.5)*(self.view.frame.size.width*1.5) , 150, 150);
imageView.userInteractionEnabled = YES;
imageView.multipleTouchEnabled = YES;
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self
action:#selector(categoryTapGestureCaptured:)];
singleTap.numberOfTapsRequired = 1;
[imageView addGestureRecognizer:singleTap];
[categoryView addSubview:imageView];
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:#"position"];
UIBezierPath *path = [UIBezierPath bezierPath];
[path addArcWithCenter:location
radius:self.view.frame.size.width*1.5
startAngle:0.8
endAngle:-0.3+(0.1*(i+1))
clockwise:NO];
animation.path = path.CGPath;
imageView.center = path.currentPoint;
animation.fillMode = kCAFillModeForwards;
animation.removedOnCompletion = NO;
animation.duration = 1+0.25*i;
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
// Apply it
[imageView.layer addAnimation:animation forKey:#"animation.trash"];
}
}
And this is the code to change the image on click.
for (UIImageView *subview in subviews) {
NSString *key = [NSString stringWithFormat:#"%#_%ld.png",subview.accessibilityHint,(long)rating];
if ([SelectedCategory isEqualToString:subview.accessibilityHint]) {
NSString *tempSubCategory = [categoryObj objectForKey:SelectedCategory];
if([selectedCategories containsObject:SelectedCategory]){
subview.image = [self.mySprites objectForKey:key];
[selectedCategories removeObject:SelectedCategory];
if (tempSubCategory.length != 0) {
subCategoriesAvailable = subCategoriesAvailable-1;
}
[self showNoPagination:subCategoriesAvailable+2];
}else{
if(selectedCategories.count != 2){
key = [NSString stringWithFormat:#"sel_%#",key];
subview.image = [self.mySprites objectForKey:key];
[selectedCategories addObject:SelectedCategory];
if ([SelectedCategory isEqualToString:#"Other"]) {
[self showCommentDialog];
}else{
if (tempSubCategory.length != 0) {
subCategoriesAvailable = subCategoriesAvailable+1;
}
[self showNoPagination:subCategoriesAvailable+2];
}
}
}
[self disableCategories];
break;
}
}
And i don't know what am doing wrong here. I tried nullifying on for loop but no use.
Code which i used for removing the image view
UIView *categoryView = [self.view viewWithTag:500];
NSArray *subviews = [categoryView subviews];
for (UIImageView *subview in subviews) {
if(![selectedCategories containsObject:subview.accessibilityHint]){
[subview removeFromSuperview];
subview.image = Nil;
}
}
Adding sprite reader code for reference
#import "UIImage+Sprite.h"
#import "XMLReader.h"
#implementation UIImage (Sprite)
+ (NSDictionary*)spritesWithContentsOfFile:(NSString*)filename
{
CGFloat scale = [UIScreen mainScreen].scale;
NSString* file = [filename stringByDeletingPathExtension];
if ([[UIScreen mainScreen] respondsToSelector:#selector(displayLinkWithTarget:selector:)] &&
(scale == 2.0))
{
file = [NSString stringWithFormat:#"%##2x", file];
}
NSString* extension = [filename pathExtension];
NSData* data = [NSData dataWithContentsOfFile:[NSString stringWithFormat:#"%#.%#", file,extension]];
NSError* error = nil;
NSDictionary* xmlDictionary = [XMLReader dictionaryForXMLData:data error:&error];
NSDictionary* xmlTextureAtlas = [xmlDictionary objectForKey:#"TextureAtlas"];
UIImage* image = [UIImage imageWithContentsOfFile:[NSString stringWithFormat:#"%#.%#", file,[[xmlTextureAtlas objectForKey:#"imagePath"]pathExtension]]];
CGSize size = CGSizeMake([[xmlTextureAtlas objectForKey:#"width"] integerValue],
[[xmlTextureAtlas objectForKey:#"height"] integerValue]);
if (!image || CGSizeEqualToSize(size, CGSizeZero)) return nil;
CGImageRef spriteSheet = [image CGImage];
NSMutableDictionary* tempDictionary = [[NSMutableDictionary alloc] init];
NSArray* xmlSprites = [xmlTextureAtlas objectForKey:#"sprite"];
for (NSDictionary* xmlSprite in xmlSprites)
{
CGRect unscaledRect = CGRectMake([[xmlSprite objectForKey:#"x"] integerValue],
[[xmlSprite objectForKey:#"y"] integerValue],
[[xmlSprite objectForKey:#"w"] integerValue],
[[xmlSprite objectForKey:#"h"] integerValue]);
CGImageRef sprite = CGImageCreateWithImageInRect(spriteSheet, unscaledRect);
// If this is a #2x image it is twice as big as it should be.
// Take care to consider the scale factor here.
[tempDictionary setObject:[UIImage imageWithCGImage:sprite scale:scale orientation:UIImageOrientationUp] forKey:[xmlSprite objectForKey:#"n"]];
CGImageRelease(sprite);
}
return [NSDictionary dictionaryWithDictionary:tempDictionary];
}
#end
Please help me to resolve this. Thanks in advance.
It looks like all the images are being retained by the dictionary(assumption) self.mySprites, as you are loading them with the call imageView.image = [self.mySprites objectForKey:categoryImage];
If you loaded the images into the dictionary with +[UIImage imageNamed:], then the dictionary initially contains only the compressed png images. Images are decompressed from png to bitmap as they are rendered to the screen, and these decompressed images use a large amount of RAM (that's the memory usage you're seeing labeled "ImageIO_PNG_Data"). If the dictionary is retaining them, then the memory will grow every time you render a new one to the screen, as the decompressed data is held inside the UIImage object retained by the dictionary.
Options available to you:
Store the image names in the self.mySprites dictionary, and load the images on demand. You should be aware that +[UIImage imageNamed:] implements internal RAM caching to speed things up, so this might also cause memory issues for you if the images are big, as the cache doesn't clear quickly. If this is an issue, consider using +[UIImage imageWithContentsOfFile:], although it requires some additional code (not much), which doesn't cache images in RAM.
Re-implement self.mySprites as an NSCache. NSCache will start throwing things out when the memory pressure gets too high, so you'll need to handle the case that the image is not there when you expect it to be, and load it from disk (perhaps using the above techniques)
CAKeyframeAnimation inherits from CAPropertyAnimation which in tern is inherited from CAAnimation.
If you see the delegate of CAAnimation class, it is strongly referenced as written below as it is declared -
/* The delegate of the animation. This object is retained for the
* lifetime of the animation object. Defaults to nil. See below for the
* supported delegate methods. */
#property(strong) id delegate;
Now you have added the reference of animation on imageView.layer, doing so the reference of imageView.layer will be strongly retained by CAAnimation reference.
Also you have set
animation.removedOnCompletion = NO;
which won't remove the animation from layer on completion
So if you are done with a image view then first removeAllAnimations from its layer and then release the image view.
I think as the CAAnimation strongly refers the imageView reference(it would also have increased it's retain count) and this could be the reason that you have removed the imageView from superview, after which it's retain count would still not be zero, and so leading to a leak.
Is there any specific requirement to set
animation.removedOnCompletion = NO;
since, setting
animation.removedOnCompletion = YES;
could solve the issue related to memory leak.
Alternatively, to resolve memory leak issue you can remove the corresponding animation on corresponding imageView' layer, by implementing delegate of CAAnimation, like as shown below -
/* Called when the animation either completes its active duration or
* is removed from the object it is attached to (i.e. the layer). 'flag'
* is true if the animation reached the end of its active duration
* without being removed. */
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {
if (flag) {
NSLog(#"%#", #"The animation is finished. Do something here.");
}
//Get the reference of the corresponding imageView
[imageView.layer removeAnimationForKey:#"animation.trash"];
}
UIView *categoryView = [self.view viewWithTag:500];
NSArray *subviews = [categoryView subviews];
for (UIImageView *subview in subviews) {
if(![selectedCategories containsObject:subview.accessibilityHint]){
[subview.layer removeAnimationForKey:#"animation.trash"]; // either this
//or// [subview.layer removeAllAnimations]; //alternatively
[subview removeFromSuperview];
subview.image = Nil;
}
}
Trying to create thumb pictures of documents that has been opened in my app with openurl.
My app can open and save .doc .xls and .pdf file, but when I try to save the screenshot it can correctly save the .doc content, for pdf and xls it only saves a blank white picture.
here are some sample documents I am testing:
.doc,
.pdf,
excel
Here is my code:
-(void)webViewDidFinishLoad:(UIWebView *)webViewCapture
{
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
NSLog(#"webViewDidFinishLoad");
NSLog(#"webview %#",webView);
NSLog(#"webViewCapture %#",webViewCapture);
UIGraphicsBeginImageContext(webView.bounds.size);
[webView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// Convert UIImage to JPEG
NSData *imgData = UIImageJPEGRepresentation(viewImage, 1);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePathLocal = [documentsDirectory stringByAppendingPathComponent:#"Inbox"];
NSArray *partialDates =[self.imageFilename componentsSeparatedByString:#"."];//split string where - chars are found
NSString* fileDescription= [partialDates objectAtIndex: 0];
//creatre unique name for image _AKIAIVLFQKM11111
NSString *uniqueFileName=[NSString stringWithFormat:#"%#_AKIAIVLFQKM11111_%#.jpeg",fileDescription,[partialDates objectAtIndex: 1]];
NSString *finalFileName= [filePathLocal stringByAppendingPathComponent:uniqueFileName];
NSError *error = nil;
if ([imgData writeToFile:finalFileName options:NSDataWritingAtomic error:&error]) {
// file saved
} else {
// error writing file
NSLog(#"Unable to write PDF to %#. Error: %#", finalFileName, error);
}
}
NSLOG:
webViewDidFinishLoad
webview <UIWebView: 0xaa79070; frame = (0 44; 768 960); autoresize = W+H; layer = <CALayer: 0xaa51000>>
webViewCapture <UIWebView: 0xaa79070; frame = (0 44; 768 960); autoresize = W+H; layer = <CALayer: 0xaa51000>>
Why I cant save real content for other types of documents with above code?
Perhaps it's a problem with the methode you are using to take the screenShot, use the one indicated by apple :
- (UIImage*)screenshot
{
// Create a graphics context with the target size
// On iOS 4 and later, use UIGraphicsBeginImageContextWithOptions to take the scale into consideration
// On iOS prior to 4, fall back to use UIGraphicsBeginImageContext
CGSize imageSize = [[UIScreen mainScreen] bounds].size;
if (NULL != UIGraphicsBeginImageContextWithOptions)
UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
else
UIGraphicsBeginImageContext(imageSize);
CGContextRef context = UIGraphicsGetCurrentContext();
// Iterate over every window from back to front
for (UIWindow *window in [[UIApplication sharedApplication] windows])
{
if (![window respondsToSelector:#selector(screen)] || [window screen] == [UIScreen mainScreen])
{
// -renderInContext: renders in the coordinate space of the layer,
// so we must first apply the layer's geometry to the graphics context
CGContextSaveGState(context);
// Center the context around the window's anchor point
CGContextTranslateCTM(context, [window center].x, [window center].y);
// Apply the window's transform about the anchor point
CGContextConcatCTM(context, [window transform]);
// Offset by the portion of the bounds left of and above the anchor point
CGContextTranslateCTM(context,
-[window bounds].size.width * [[window layer] anchorPoint].x,
-[window bounds].size.height * [[window layer] anchorPoint].y);
// Render the layer hierarchy to the current context
[[window layer] renderInContext:context];
// Restore the context
CGContextRestoreGState(context);
}
}
// Retrieve the screenshot image
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
For more detail : Screen Capture in UIKit Applications
So two ways I can think of working this out are as follows:
1.) Subclass UIWebview and implement drawRect. in drawRect save a screenshot as you have direct access to the graphicsContext. After you have a screenshot assign it to a custom property on the webview. Then whenever you need it, it should be readily available.
2.) take screenshot asynchronously and guarantee that the webview will exist or do proper error handling on the asynch task to handle the event that the webview no longer exists.
I personally would prefer #2 as it pulls some heavy lifting off the main thread and should still work properly.
I'm trying to save all of the contents of a UIScrollView to a .pdf. I found some tutorials for saving the current view, and they all rely on creating a CGContextRef using UIGraphicsGetCurrentContext(). Right now, I capture my view with just
CGContextRef context = UIGraphicsGetCurrentContext();
[myView.layer renderInContext:context];
And that works fine for a plain UIView. However, when I try to pass a UIScrollView as myView, it passes the visible part of the UIScrollView fine, but anything offscreen is just white space. Is there a way I can expand context somehow to get all of the content in my UIScrollView, and not just what is currently visible? I suspect that I can't use UIGraphicsGetCurrentContext() for a UIScrollView, but I don't know what to use instead, and the Apple docs on this aren't really very helpful.
If you have a subview taking the whole content size of the scrollView with the scrolling content you can do it like this:
CGContextRef context = UIGraphicsGetCurrentContext();
UIView *contentView = [scrollView subviews][0];
[contentView.layer renderInContext:context];
If there are multiple views in the scrollView you can do it like this:
UIView *contentView = [[UIView alloc] initWithFrame:CGRectMake(
scrollView.frame.origin.x,
scrollView.frame.origin.y,
scrollView.contentSize.width,
scrollView.contentSize.height)];
for(UIView *view in [scrollView subviews]){
[contentView addSubview: view];
}
CGContextRef context = UIGraphicsGetCurrentContext();
[contentView.layer renderInContext:context];
Then you need to get the views back into the scrollView. Probably there is a way to copy them but I am not sure how. Anyhow here is what should work:
for(UIView *view in [contentView subviews]){
[view removeFromSuperView];
[scrollView addSubview:view];
}
You can set frame of UIScrollView equal to content size of it and content offset to 0 before calling renderInContext. After that revert frame to original.
myView.frame = CGRectMake(myView.frame.origin.x,myView.frame.origin.y,myView.contentSize.with,myView.contentSize.height);
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;
}
Check ScrollViewToPDF example and understand it.
It uses same scrollview's layer renderInContext but here PDF is created according to your requirement such as one page PDF or multiple page PDF
Note : It captures all visible as well as invisible part of scrollView
Closed. This question needs debugging details. It is not currently accepting answers.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 5 years ago.
Improve this question
Alright, here's what's happening... I have a UIView subclass, which includes two points (start and end), a CGPath between those two points and lot of UILabels. If I add that UIView subclass as a subview to my scrollview (over top of my CATiledLayer based UIView) then my app starts getting memory warnings and eventually crashes. However, if I remove the UIView subclass that contains the points and path and leave the CATiledLayer view as it is, everything functions perfectly and no crashing or memory warnings occur.
Does anyone have any ideas on why this is occurring? The content view shouldn't have any problems being so big should it since I'm only draw labels that are at max 40px wide and a CGPath, which is also pretty small?
This is a mapping application
Here's some code:
//Display the map image
- (void)displayTiledImageNamed:(NSString *)imageName size:(CGSize)imageSize {
self.zoomScale = 1.0;
container = [[UIView alloc] initWithFrame:(CGRect){ CGPointZero, imageSize }];
_zoomView = [[UIImageView alloc] initWithFrame:(CGRect){ CGPointZero, imageSize }];
NSString *path = [NSString stringWithFormat:#"%#/%#-Small.png",[[NSBundle mainBundle] bundlePath], [imageName stringByDeletingPathExtension]];
UIImage *zoomImage = [UIImage imageWithContentsOfFile:path];
[_zoomView setImage:zoomImage];
[container addSubview:_zoomView];
[_zoomView release];
_tilingView = [[UMTileView alloc] initWithImageName:imageName size:imageSize];
_tilingView.frame = _zoomView.bounds;
[_zoomView addSubview:_tilingView];
[_tilingView release];
[self configureForImageSize:imageSize];
//This is the view that's causing the crash and memory warnings
//If this view is commented out the app functions just fine
UMMapContentView *m = [[UMMapContentView alloc] initWithFrame:CGRectMake(0,0,imageSize.width,imageSize.height) andColors:self.colors mapView:self.mapView];
self.contentView = m;
[container addSubview:self.contentView];
[m release];
[self addSubview:container];
[container release];
}
This my path view class which is another subview inside the UMMapContentView view above:
+ (Class)layerClass {
return [CATiledLayer class];
}
+ (CFTimeInterval)fadeDuration {
return 0.0;
}
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
self.userInteractionEnabled = NO;
self.backgroundColor = [UIColor clearColor];
}
return self;
}
- (void)dealloc {
self.path = nil;
self.pathColor = nil;
[super dealloc];
}
- (void)resetPathView {
CATiledLayer *tiledLayer = (CATiledLayer*)self.layer;
tiledLayer.contents = nil;
[tiledLayer setNeedsDisplay];
}
- (void)drawPath:(UMPath*)p {
self.path = p;
[self setNeedsDisplay];
}
- (void)drawRect:(CGRect)rect {
if (self.path) {
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetStrokeColorWithColor(context, self.pathColor.CGColor);
CGContextSetShadowWithColor(context, CGSizeMake(2.0, 1.0), 1.0, [[UIColor colorWithWhite:0.2 alpha:0.8] CGColor]);
CGContextSetLineWidth(context, 8.0);
CGContextBeginPath (context);
CGContextMoveToPoint (context, ((UMMapPoint*)[self.path.points objectAtIndex: 0]).x, ((UMMapPoint*)[self.path.points objectAtIndex: 0]).y);
for (int i = 1; i < self.path.points.count; i++) {
CGContextAddQuadCurveToPoint (context, ((UMMapPoint*)[self.path.points objectAtIndex:i-1]).x, ((UMMapPoint*)[self.path.points objectAtIndex: i-1]).y, ((UMMapPoint*)[self.path.points objectAtIndex:i]).x, ((UMMapPoint*)[self.path.points objectAtIndex:i]).y);
}
CGContextStrokePath (context);
}
}
And this is my method that places all the UILabels in the UMMapContentView view:
- (void)mapAllLabelsInNavigationMap:(int)navigationMap {
//There are 1109 label dictionaries in the labels array
for (NSDictionary *dict in labels) {
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake([[dict objectForKey:#"X"] floatValue],[[dict objectForKey:#"Y"] floatValue],[[dict objectForKey:#"Width"] floatValue],[[dict objectForKey:#"Height"] floatValue])];
[label setLineBreakMode:NSLineBreakByWordWrapping];
[label setNumberOfLines:0];
[label setBackgroundColor:[UIColor clearColor]];
[label setTextColor:[self colorFromHexString:[dict objectForKey:#"Foreground"]]];
[label setFont:[UIFont systemFontOfSize:[[dict objectForKey:#"FontSize"] floatValue]]];
[label setTextAlignment:NSTextAlignmentCenter];
[label setText:[[UMDataBase shared] stringForID:[[dict objectForKey:#"Texts_ID"] intValue] withLanguage:languageID]];
[self addSubview:label];
[localMapLabels addObject:label];
[label release];
}
}
I'm not really sure what direction I need to head... Any help would be much appreciated! :)
You did not give the source code of UMMapContentView, but if it uses CATiledLayer, then that may be the problem. It seems that you cannot subview a CATiledLayer-backed view.
Scroll to the bottom (in the comments section): http://red-glasses.com/index.php/tutorials/catiledlayer-how-to-use-it-how-it-works-what-it-does/
It may be easier if you write your own tiled layer anyhow. Documentation on CATiledLayer is sparse while the bugs are aplenty.