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POSaving To Documents Directory On iOS Intermittently Works / Fails
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copied!<p>Is there any reason why writing and saving a PDF file to the Documents directory in an iOS application would only be intermittently successful? In my app I am created a PDF from an array of UIViews, accessing the Documents folder and storing the file in there. </p> <p>I would estimate that this works 80% of the time. The other 20% of the time the PDF gets created (I also email it to myself which works) but it never actually get written to the Documents folder.</p> <p>In the case of failure, I can email myself the PDF so I know it gets created. When I inspect the Documents folder in a file explorer it's empty. When I log out the contents of it it is also empty. I'm using the following code to create the PDF and export to Documents.</p> <pre><code>- (NSURL *)applicationDocumentsDirectory { return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject]; } -(void)createPDFfromUIViews:(NSArray *)views saveToDocumentsWithFileName:(NSString*)aFilename andTag:(NSInteger)tag { // Creates a mutable data object for updating with binary data, like a byte array NSMutableData *pdfData = [NSMutableData data]; // Points the pdf converter to the mutable data object and to the UIView to be converted UIView *view1 = [views objectAtIndex:0]; UIGraphicsBeginPDFContextToData(pdfData, view1.bounds, nil); CGContextRef pdfContext = UIGraphicsGetCurrentContext(); // draws rect to the view and thus this is captured by UIGraphicsBeginPDFContextToData for (UIView *view in views) { UIGraphicsBeginPDFPage(); [view.layer renderInContext:pdfContext]; } // remove PDF rendering context UIGraphicsEndPDFContext(); // Get the path to the documents directory and append the filename of the PDF NSString *path = [[self applicationDocumentsDirectory].path stringByAppendingPathComponent:aFilename]; NSLog (@"DOCUMENTS DIRECTORY : %@", [self applicationDocumentsDirectory].path); NSLog (@"DOCUMENTS DIRECTORY WITH FILE PATH : %@", path); NSError *error = nil; BOOL success = [pdfData writeToFile:path options:NSDataWritingWithoutOverwriting error:&error]; if (!success) { NSLog(@"Error writing PDF: %@", [error localizedDescription]); } else { if (tag == 1) { NSLog(@"PDF Saved With Name %@", aFilename); [self.navigationController popViewControllerAnimated:YES]; } else if (tag == 2) { [self checkAccountAndComposeEmailWithAttachmentData:pdfData andSubject:aFilename]; } } } </code></pre> <p>UPDATE: Code amended to include NSError. The error given is "The operation couldnt be completed. (Cocoa Error 4.)</p> <p>UPDATE 2: Amended the code to include Apple's recommended method of grabbing the Documents directory. Also added in a number of logs to show that I am getting correct Directory / File Path - both are showing the Documents folder or the Documents/File Name as expected. Still returns <code>NSFileNoSuchFileError</code> as an error every time.</p>

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