iOS performSelectorOnMainThread with multiple arguments

objective-c ios arguments performselector
McDermott picture McDermott · Nov 30, 2011 · Viewed 26.6k times · Source

I would like to perform a selector on the main thread from another thread, but the selector has multiple arguments, similar to this:

-(void) doSomethingWith:(int) a b:(float)b c:(float)c d:(float)d e:(float)e { //... }

How can I get this working with performSelectorOnMainThread: withObject: waitUntilDone:?

EDIT

I would like to explain why i need this.

I'm working with UIImageViews on the main thread, and I make the calculations for them on another thread. I use a lot of calculations so if i make everything on the main thread, the app lags. I know that UI elements can only be manipulated on the main thread, this is why i would like it to work this way, so the main thread can listen to touch events without lags.

Answer

DarkDust picture DarkDust · Nov 30, 2011

When you're using iOS >= 4, you'd do this instead:

dispatch_async(dispatch_get_main_queue(), ^{
    [self doSomething:1 b:2 c:3 d:4 e:5];
});

That's like doing waitUntilDone:NO. If you want to wait until the method is finished, use dispatch_sync instead.

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