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POis it necessary to use dispatch_queue at here
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  1. POis it necessary to use dispatch_queue at here
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    copied!<p>Hopefully it is an appropriate question to ask. My goal is </p> <pre><code>1.add a controller into an array name 'arrControllers' 2.access and get current controller from 'arrControllers' to do sth with it </code></pre> <p>and I just wanna make sure the <code>arrControllers</code> should be ready before I access and use it. That is why I am using <code>serial queue</code> and <code>dispatch_sycn</code> like like following.</p> <pre><code>-(void)viewDidLoad { [super viewDidLoad]; firstViewController = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil]; [self setUpWithView:firstViewController]; } </code></pre> <p>and in <code>setUpWithView:</code> is</p> <pre><code>-(void)setUpWithView:(UIViewController*)viewController { dispatch_queue_t queue; queue = dispatch_queue_create("my queue", NULL); containerController = [ContainerViewController sharedContainerController]; // What I am taking about is from now on dispatch_sync(queue, ^{ [containerController initWithRootViewController:viewController]; }); dispatch_sync(queue, ^{ [containerController setUpView]; }); } </code></pre> <p>and <code>initWithRootViewController:</code> is</p> <pre><code>- (void)initWithRootViewController:(UIViewController*)rootViewController { arrControllers = [[NSMutableArray alloc] init]; arrControllers = [NSMutableArray arrayWithObject:rootViewController]; } </code></pre> <p>and <code>setUpView</code> is</p> <pre><code> -(void)setUpView { /* Process to ADD currentController TO hierarchy */ [self addChildViewController:[arrControllers lastObject]]; ............................................................ } </code></pre> <p>As far as I know the compiler will execute codes line by line, it means by do following</p> <pre><code>-(void)setUpWithView:(UIViewController*)viewController { containerController = [ContainerViewController sharedContainerController]; // Not using serial_queue and dispatch_sync [containerController initWithRootViewController:viewController];// line1 [containerController setUpView]; //line2 } </code></pre> <p>compiler will execute line2 until it finished the task at line1.</p> <p>My question is </p> <pre><code>1. is it necessary to using `serial_queue` and `dispatch_sycn`for this situation. </code></pre> <p>PS: if you think it is a bad question to ask. please comment what you think about it.</p>
 

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