StackOverflow2013

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5592941
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0
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2011-04-08T09:10:56.990
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2011-04-08T09:10:56.990
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191596
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5592359
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it's better to create a protocol: <pre><code>@protocol MONStuffParserRecipientProtocol @required - (void)parsedStuffIsReady:(NSDictionary *)parsedStuff; @end </code></pre> and to declare the view controller: <pre><code>@class MONStuffDownloadAndParserOperation; @interface MONViewController : UIViewController < MONStuffParserRecipientProtocol > { MONStuffDownloadAndParserOperation * operation; // add property } ... - (void)parsedStuffIsReady:(NSDictionary *)parsedStuff; // implement protocol @end </code></pre> and add some backend: to the view controller <pre><code>- (void)displayDataAtURL:(NSURL *)url { MONStuffDownloadAndParserOperation * op = self.operation; if (op) { [op cancel]; } [self putUpLoadingIndicator]; MONStuffDownloadAndParserOperation * next = [[MONStuffDownloadAndParserOperation alloc] initWithURL:url recipient:viewController]; self.operation = next; [next release], next = 0; } </code></pre> and have the operation hold on to the view controller: <pre><code>@interface MONStuffDownloadAndParserOperation : NSOperation { NSObject<MONStuffParserRecipientProtocol>* recipient; // << retained } - (id)initWithURL:(NSURL *)url Recipient:(NSObject<MONStuffParserRecipientProtocol>*)recipient; @end </code></pre> and have the operation message the recipient when the data is downloaded and parsed: <pre><code>// you may want to message from the main thread, if there are ui updates [recipient parsedStuffIsReady:parsedStuff]; </code></pre> there are a few more things to implement -- it's just a form. it's safer and involves direct messaging, ref counting, cancellation, and such.
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1. PONSnotifications for multiple downloads
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1. PTAnswer
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1. USjustin
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