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    <p>Of course it's possible Will and it has very little to do with AFNetworking but much more to do with common programming patterns.</p> <p>You're going to need to store the <code>AFURLConnectionOperation</code> object outside of your view controllers where they can both access it. The best practice here would be creating a <a href="https://stackoverflow.com/questions/5720029/create-singleton-using-gcds-dispatch-once-in-objective-c">singleton class</a> that encapsulates the AFNetworking properties and methods to handle uploading your image(s). Whenever you need information about or to interact with that upload you can simply access that singleton via a class method like a <code>sharedInstance</code>.</p> <pre><code>+ (id)sharedInstance { static dispatch_once_t once; static id sharedInstance; dispatch_once(&amp;once, ^{ sharedInstance = [[self alloc] init]; }); return sharedInstance; } </code></pre> <p>If you are interacting with a web service (and not a raw FTP server), then subclassing <a href="http://afnetworking.github.com/AFNetworking/Classes/AFHTTPClient.html" rel="nofollow noreferrer">AFHTTPClient</a> would probably be your best bet for the 'upload manager' type of class solution.</p> <p>Whatever you choose, once you have a simple class put together you can then register for KVO notifications in your ViewControllers' viewWillAppear &amp; unregister in viewWillDisappear to cleanly handle your UI updates (e.g. progress bar). If you don't understand Key-Value Observing, read the <a href="http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/KeyValueObserving/KeyValueObserving.html#//apple_ref/doc/uid/10000177i" rel="nofollow noreferrer">Introduction to Key-Value Observing Programming Guide</a>. You'll be much more able to cope in iOS after having that knowledge under your belt.</p> <p>So, in view A's upload code, use your magic new class to create and enqueue the upload using a URL (multiple methods could be made to use images in-memory, NSFileURLs or an NSString as shown here)</p> <pre><code>[[MyImageUploadManager sharedInstance] uploadImageFromPath:@"/wherever/1.png" toURL:[NSURL URLWithString:@"ftp://someserver.com/images/"]]; </code></pre> <p>…in View C's controller's viewWillAppear</p> <pre><code>- (void) viewWillAppear:(BOOL)animated { ... [[MyImageUploadManager sharedInstance] addObserver:self forKeyPath:@"progress" options:NSKeyValueObservingOptionNew context:nil]; ... } </code></pre> <p>… and in View C's viewWillDisappear</p> <pre><code>- (void)viewWillDisappear:(BOOL)animated { ... [[MyImageUploadManager sharedInstance] removeObserver:self forKeyPath:@"progress" context:nil]; ... } </code></pre> <p>Whenever that 'progress' property changes in your upload manager class, iOS will call the function <code>observerValueForKeyPath:ofObject:change:context:</code>. Here's what a very simple version of that looks like:</p> <pre><code>-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if ( [keyPath isEqualToString:@"progress"] ) { // since you only upload a single file, and you've only added yourself as // an observer to your upload, there's no mystery as to who has sent you progress float progress=[change valueForKey:NSKeyValueChangeNewKey]; NSLog(@"operation:%@ progress:%0.2f", object, progress ); // now you'd update the progress control via a property bound in the nib viewer [[_view progressIndicator] setProgress:progress]; } else { [super observeValueForKeyPath:keyPath ofObject:object change:change context:context]; } } </code></pre> <p>That should get you well on the way, hope that was helpful.</p>
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    1. POHow do I get progress of a AFNetworking AFURLConnectionOperation that is running in the background?
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    1. POHow do I get progress of a AFNetworking AFURLConnectionOperation that is running in the background?
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