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POiOS: Grand Central Dispatch and ViewControllers
 

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  1. POiOS: Grand Central Dispatch and ViewControllers
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    <p>At this point I'm pretty frustrated but I'm sure it is something I'm missing. In this code my segue to my new viewController is showing up after the rest of the function is executed. How do I get my viewController to be the code being executed? Basically stop the tweetText function from happening until that view is closed I'm trying to give the user an option to select a twitter account if there is more than one. I have tried many different ways. In Apples own example code they suggest to give the user an option but give nothing on how to do it without blowing through the rest of the code.</p> <p>Here is the code:</p> <pre><code> [accountStore requestAccessToAccountsWithType:accountType withCompletionHandler:^(BOOL granted, NSError *error) { if(granted) { dispatch_sync(dispatch_get_main_queue(), ^{ // Get the list of Twitter accounts. self.accountsArray = [accountStore accountsWithAccountType:accountType]; if([self.accountsArray count] &gt; 1 /* Check method to see if preference is still a valid account */) { // Display user accounts if no preference has been set [self performSegueWithIdentifier:@"TwitterAccounts" sender:self.accountsArray]; [tweet tweetText:tweetString account:self.twitterAccount type:AchievementTweet]; } else { [tweet tweetText:tweetString account:[self.accountsArray lastObject] type:AchievementTweet]; } }); } else { [tweet performSelectorOnMainThread:@selector(displayText:) withObject:[NSNumber numberWithInt:403] waitUntilDone:NO]; } }]; </code></pre>
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    1. USSedate Alien
    1. USMichael
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    1. COWhy don't you use a delegate ?
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      1. POiOS: Grand Central Dispatch and ViewControllers
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    2. COdispatch_sync(dispatch_get_main_queue() is wrong, you should never dispatch in a syncronous way using the main queue since it will only result in your application freezing.
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      1. POiOS: Grand Central Dispatch and ViewControllers
      1. USPochi
    3. COSorry, but i think you are wrong in this case, this code is not freezing because according to apple this function is using gcd already. It seems like its running on another thread and that is the issue I'm having. I can't get the accounts to return and show for the user to select. It always shows up after the other methods have completed.
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      1. POiOS: Grand Central Dispatch and ViewControllers
      1. USMichael
 

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