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PORunning a background thread not working
 

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  1. PORunning a background thread not working
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    <p>I'm trying to run -getHTMLupdate in background but it's not working.</p> <p>-viewDidLoad</p> <pre><code>- (void)viewDidLoad { UIImage *navBarImage = [[UIImage imageNamed:@"menubar.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(5, 15, 5, 15)];//Navbar [[UINavigationBar appearance] setBackgroundImage:navBarImage forBarMetrics:UIBarMetricsDefault]; [self performSelectorInBackground:@selector(getHTMLupdate) withObject:nil]; } </code></pre> <p>Here's -getHTMLupdate</p> <pre><code>-(void) getHTMLupdate { NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init]; /* set headers, etc. on request if needed */ [request setURL:[NSURL URLWithString:@"http://appstarme.com/GD/GDHTMLPARSINGINFORMATION.php"]]; NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:NULL error:NULL]; NSString *html = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSScanner *scanner = [NSScanner scannerWithString:html]; NSString *token = nil; [scanner scanUpToString:@"&lt;h1&gt;" intoString:NULL]; [scanner scanUpToString:@"&lt;/h1&gt;" intoString:&amp;token]; NSLog(@"DATA : %@", html); _updateFromUser.text = html; </code></pre> <p>Here's the console output</p> <pre><code> 2013-07-02 20:26:25.775 Social App[8130:3707] DATA : Please check out the new Skype contest at www.Skype.com 2013-07-02 20:26:25.776 Social App[8130:3707] bool _WebTryThreadLock(bool), 0x1e8ab970: Tried to obtain the web lock from a thread other than the main thread or the web thread. This may be a result of calling to UIKit from a secondary thread. Crashing now... 1 0x3a021259 WebThreadLock 2 0x36083185 &lt;redacted&gt; 3 0xc75fd -[homeChannel getHTMLupdate] 4 0x349e7231 &lt;redacted&gt; 5 0x3c2170e1 &lt;redacted&gt; 6 0x3c216fa8 thread_start </code></pre> <p>The NSLog oddly returns the correct data but the app still crashes</p> <p>EDIT</p> <p>Added this at the end of the code</p> <pre><code>[_updateFromUser performSelectorOnMainThread: @selector(setText:) withObject: html waitUntilDone: FALSE]; </code></pre> <p>worked perfectly.</p>
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    1. USIamGretar
    1. USIamGretar
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    1. COYou are not supposed to change any UI stuff outside the main thread! In the last line of you getHTMLupdate you do, is this the problem?
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      1. PORunning a background thread not working
      1. USNils Ziehn
 

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