Code execution in objective c

HI all, if i've somthing like this:

my code....
// active indicator activity
[otherClass method]; // method that takes 5-6 seconds
// disable indicator activity
my code...

When the long method is called, in my class code is blocked right?

If i active an indicator activity before call the method, it will be animating while "method"开发者_如何学JAVA is executing?

Thanks.

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As iceydee mentions, the UI elements (like your activity indicator) run on the main thread. If you load a big file, download something or any other thing that takes time, you must execute that on other thread if you want to animate UI elements. You can use Grand Central Dispatch, performSelectorInBackGround or other techniques (not recommendable). I would make:

my code....
// active indicator activity
[otherClass performSelectorInBackground:@selector(method) withObject:nil]; // method that takes 5-6 seconds
my code...

Then in otherClass's method, stop the activity indicator on the main thread:

[activityIndicator performSelectorOnMainThread:@selector(stopAnimating) withObject:nil waitUntilDone:NO];

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You should avoid blocking the main thread for that long, consider breaking the method into two - running [otherClass method] in a separate thread. The main thread is used for UI updates, unsure if the indicator will be able to operate with main thread blocked, I think not.

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Yes, it will be blocked unless you run your long method in another thread.

To do this use a technique like this. see performSelectorInBackground and performSelectorOnMainThread.