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POA bit help for using queuing and Grand Central Dispatch on iOS
 

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    <p>This is my problem, I'm building an iOS with some JSON returs from my server, here, no problems, all works fine.</p> <p>The problem is that when I run the program, it take a long long time to parse the result into a <code>NSMutableArray</code>: this is the log</p> <pre><code>2013-01-10 12:03:48.627 project[5917:907] &lt;- time begin parser 2013-01-10 12:03:48.755 project[5917:907] &lt;- time finish parser 2013-01-10 12:03:48.756 project[5917:907] &lt;- time begin implement arrays 2013-01-10 12:03:58.522 project[5917:907] &lt;- time finish implement array </code></pre> <p>As you can see, implementing the arrays is <strong>really</strong> long.</p> <p>I know that I have to use queueing and grand central dispatch to make my UI responsive, but I don't know how to, could you please help me to do that ?</p> <p>This is my <code>viewDidLoad</code> Method</p> <pre class="lang-objc prettyprint-override"><code>- (void)viewDidLoad { [super viewDidLoad]; if debug NSLog(@"&lt;- time begin parser"); endif NSString *URLStr = @"http://myJsonFile.json"; NSDictionary *myDictwithReturn = [TOCJSONParser awesomeParserWithStringOfYourJSONFile:URLStr]; //really cool parser, i can put it on gitHub if you want NSArray *speakersArray = [myDictwithReturn objectForKey:@"speakers"]; myArray = [[NSMutableArray alloc]init]; NSLog(@"&lt;- time finish parser"); NSLog(@"&lt;- time begin implement arrays"); for (NSDictionary *myDict in speakersArray) { _nextSpeaker = [[TOCSpk alloc]init]; [_nextSpeaker setName:[myDict objectForKey:@"name"]]; [_nextSpeaker setBusiness:[myDict objectForKey:@"business"]]; [_nextSpeaker setDesc:[myDict objectForKey:@"desc"]]; [_nextSpeaker setTwitter:[NSURL URLWithString:[myDict objectForKey:@"twitter"]]]; [_nextSpeaker setPicture:[_nextSpeaker retrieveImageFromServer:[myDict objectForKey:@"picture"]]]; [myArray addObject:_nextSpeaker]; } NSLog(@"&lt;- time finish implement array"); } </code></pre>
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    1. COIt seems there's an error in your code. Shouldn't the loop be: `for (NSDictionary * myDict in speakersArray) `?
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    2. COedited, thx, but it's not the pb here, just edited the code to be more explicit
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