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iphoneobjective-cmultithreading
BPS1945
BPS1945

Reputation: 163

iphone multithread api

I have a problem with the Objective c mutithreaded method.

[self performSelectorOnMainThread:@selector(displayThread2Counts:)
      withObject:myNumber
      waitUntilDone:NO];

What is the meaning of the parameter "waitUntilDone"?

What is the difference between waitUntilDone:YES and waitUntilDone:NO?

Upvotes: 2

Views: 540

Answers (1)

John Parker
John Parker

Reputation: 54445

The documentation is pretty transparent:

A Boolean that specifies whether the current thread blocks until after the specified selector is performed on the receiver on the main thread. Specify YES to block this thread; otherwise, specify NO to have this method return immediately.

In other words, if you specify YES for the waitUntilDone parameter no other action will take place on the current thread until the requested selector has finished its work.

However as a corollary, if you're only using a single thread (the main thread) there's no value in specifying YES, as all you're effectively doing is calling the requested selector as you would in a non-threaded environment.

Upvotes: 3

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