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POHow do I create a global UIManagedDocument instance per document-on-disk shared by my whole application using blocks?
 

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  1. POHow do I create a global UIManagedDocument instance per document-on-disk shared by my whole application using blocks?
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    <p>I am trying to design a helper method which will retrieve a UIManagedDocument, then open and return it, so that I may access the same UIManagedDocument from several places in my app.</p> <p>I am having trouble with the asynchronous nature of this as I am not too familiar with blocks. Ideally the sequence of events would be this:</p> <ol> <li>Class X calls the helper method to retrieve the UIManagedDocument and includes a block of code to run when the opened document is returned.</li> <li>The class method retrieves the UIManagedDocument and calls openWithCompletionHandler or saveToURL as necessary, and includes a block of code to run when the opened document is returned.</li> <li>openwithCompletionHandler or saveToURL complete their task, and return with success = YES and run the code in its block</li> <li>The class method completes its task and returns with an open UIManagedDocument and runs the code in its block</li> </ol> <p>Can I pass the original block through somehow?</p> <p>Here's my code so far. Any thoughts hugely appreciated, thanks.</p> <pre><code>// This is a dictionary where the keys are "Vacations" and the objects are URLs to UIManagedDocuments static NSMutableDictionary *managedDocumentDictionary = nil; // This typedef has been defined in .h file: // typedef void (^completion_block_t)(UIManagedDocument *vacation); // The idea is that this class method will run the block when its UIManagedObject has opened @implementation MyVacationsHelper + (void)openVacation:(NSString *)vacationName usingBlock:(completion_block_t)completionBlock { // Try to retrieve the relevant UIManagedDocument from managedDocumentDictionary UIManagedDocument *doc = [managedDocumentDictionary objectForKey:vacationName]; // Get URL for this vacation -&gt; "&lt;Documents Directory&gt;/&lt;vacationName&gt;" NSURL *url = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject]; url = [url URLByAppendingPathComponent:vacationName]; // If UIManagedObject was not retrieved, create it if (!doc) { // Create UIManagedDocument with this URL doc = [[UIManagedDocument alloc] initWithFileURL:url]; // Add to managedDocumentDictionary [managedDocumentDictionary setObject:doc forKey:vacationName]; } // If document exists on disk... if ([[NSFileManager defaultManager] fileExistsAtPath:[url path]]) { [doc openWithCompletionHandler:^(BOOL success) { // Can I call the completionBlock from above in here? // How do I pass back the opened UIDocument }]; } else { [doc saveToURL:url forSaveOperation:UIDocumentSaveForCreating completionHandler:^(BOOL success) { // As per comments above }]; } } </code></pre>
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