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iphonecocoa-touchnsoperationnsoperationqueuensinvocationoperation
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Reputation: 310

Multiples arguments to NSOperation?

I'm using NSOperationQueue in my app and i want to set multiples arguments to my operation how can i do that?

   NSOperationQueue *queue = [[[NSOperationQueue alloc] init] autorelease];
   NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(methodCall) object:nil];
  [queue addOperation:operation];
  [operation release];

Upvotes: 0

Views: 2152

Answers (2)

atsawant
atsawant

Reputation: 36

//Correct approach is to use NSInvocation
//create nsinvocation obj
SEL selector= @selector(methodName:);
NSMethodSignature * sig= [[self class] instanceMethodSignatureForSelector: selector];
NSInvocation * invocation=[NSInvocation invocationWithMethodSignature:sig];
[invocation setTarget: self];   
[invocation setSelector:selector];
[invocation setArgument:&firstArgument atIndex: 2];
[invocation setArgument:&secArgument atIndex: 3];
//operation with invocation
NSInvocationOperation* operation = [[NSInvocationOperation alloc] initWithInvocation:invocation];
[opQueue addOperation:operation];

Upvotes: 2

rosslebeau
rosslebeau

Reputation: 1283

You will have to create an array or dictionary with the data you need.

Ex:

NSOperationQueue *queue = [[[NSOperationQueue alloc] init] autorelease];
NSDictionary *argumentDictionary = [NSDictionary dictionaryWithObjectsAndKeys:object1, @"Object1Key", object2, @"Object2Key", nil];
NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(methodCall:) object:argumentDictionary];
[queue addOperation:operation];
[operation release];

and in - (void)methodCall:(NSDictionary *)argumentDictionary you can use the objects and values stored in that dictionary.

Upvotes: 6

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