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Editorial Team
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Asked: 2026-05-29T10:12:01+00:00

Just for my curiousity, I am trying to rewrite the following code // show

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Just for my curiousity, I am trying to rewrite the following code 

// show HUD (with animation)
[SVProgressHUD showWithStatus:@"loading..."];

// wait for HUD to safely finish showing its animation
// (loading HUD will be visible for 1 sec)
[[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:1]]

// dismiss HUD
// (dismiss HUD will be visible for 2 sec)
[SVProgressHUD dismissWithSuccess:@"finished!" afterDelay:2];

into the code using Grand Central Dispatch.

I tried using dispatch_source_t, dispatch_semaphore_t, and dispatch_after,
but doesn’t quite work well:( and I need your help!

Please note that I don’t want to wrap SVProgressHUD’s methods with any blocks!

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1 Answer

  1. Editorial Team

    You really can’t. Or, you could, but it’d be a ton of work that would ultimately just wrap the NSRunLoop stuff itself.

    Within the context of iOS and Mac OS X, the main event loop is a run loop and things like modal panels, HUDs, and the like are all designed around that detail.

    The code you are showing is a nested run loop. You are effectively running the main run loop in a sub-loop within an outer loop that is also maintained by the main run loop! (If you were to set a breakpoint on an action method fired within your internal loop, you would see what I mean in the backtrace).

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