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POAccessing UIcomponents with multiple threads
 

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  1. POAccessing UIcomponents with multiple threads
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    <p>I'm really struggling with a multi-thread program that changes an IBOutlet when external variables change.</p> <p>With class header:</p> <pre class="lang-c prettyprint-override"><code>@interface QuestionViewController : UIViewController{ // IBOutlet IBOutlet UIBarButtonItem *changeButton; ... } </code></pre> <p>Starting the thread:</p> <pre class="lang-c prettyprint-override"><code> // Starts new thread with method 'statusPollMethod' to determine when status [NSThread detachNewThreadSelector:@selector(statusPollMethod:) toTarget:self withObject: @"Voting"]; </code></pre> <p>Begins:</p> <pre class="lang-c prettyprint-override"><code>-(void)statusPollMethod:requiredStatus{ GetSessionDataApi *statusPoll = [GetSessionDataApi new]; SessionCache *tempSessionCache = [SessionCache new]; ... @synchronized(self){ // Infinite Loop while(1) { // If sessionStatus is 'Voting' set button as displayed if ([[tempSessionCache sessionStatus] isEqualToString: (@"Voting")]){ NSLog(@"Status is Voting!"); // Ungreys and sets the button [changeButton setTitle:@"Submit"]; changeButton.enabled = YES; } // Wait for around 3 seconds [NSThread sleepForTimeInterval:3]; } } return; } </code></pre> <p>The problem is that the 2nd thread only occasionally completes any action on the IBOutlet. The IBOutlet is also accessed by the 1st thread, so I'm aware I probably have some multi-threading issues and I'm unsure how to protect the IBOutlet from this.</p> <p>As advised, I've looked through Apple Docs/Overflow posts, but I'm still confused.</p> <p>I really appreciate your help!</p> <p>Tim</p>
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    1. USTim Windsor Brown
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    1. COis your problem is with not execution of following LOC - [changeButton setTitle:@"Submit"]; changeButton.enabled = YES;
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      1. USrishi
 

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