iOS performSelectorOnMainThread with multiple arguments

问题

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.

回答1:

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.

回答2:

You'll need to use a NSInvocation

Create the object, set the target, selector and arguments.
Then, use

[ invocationObject performSelectorOnMainThread: @selector( invoke ) withObject: nil, waitUntilDone: NO ];

回答3:

you can pass one object of NSDictionary/NSArray type having required arguments.

and accept the same type of object in your function. then, decompose the values and proceed with processing.

you have to use NSNumber for numeric values for adding them to NSarray/NSDictionary and later on in your function, you can convert them back with intValue/floatValue etc

best of buck.

来源：https://stackoverflow.com/questions/8326465/ios-performselectoronmainthread-with-multiple-arguments