nsinvocation

I have an array which I am iterating and looking for a particular flag. If the flag value is nil, I am calling a method which generates an invocation object and returns the result of invocation. My code structure is as follows for(NSString *key in [taxiPlanes allKeys]) { Plane *currentPlane = [taxiPlanes objectForKey:key]; if(currentPlane.currentAction == nil) { NSString *selector = [[currentPlane planeTakeoffSequence] firstObject]; currentPlane.currentAction = selector; // Calling for NSInvocation in [self ...] NSArray *action = [NSArray arrayWithArray:[self operationFromTakeoffAction

I have a timer calling a method but this method takes one paramether: theTimer = [NSTimer scheduledTimerWithTimeInterval:animationInterval target:self selector:@selector(timer) userInfo:nil repeats:YES]; should be theTimer = [NSTimer scheduledTimerWithTimeInterval:animationInterval target:self selector:@selector(timer:game) userInfo:nil repeats:YES]; now this syntax doesn't seems to be right. I tried with NSInvocation but I got some problems: timerInvocation = [NSInvocation invocationWithMethodSignature: [self methodSignatureForSelector:@selector(timer:game)]]; theTimer = [NSTimer

I want to do NSURLConnection in background mode,because it response is having much data.Forums are telling to use Apple's finite length coding to use in didEnterBackground . but I want to avoid it.instead of it I use following code through NSOperation with NSInvocation as, but it is not working. connectToServer is having NSURLConnection operation.any help please? didReceiveData , didReceiveResponse delegate methods are not called? NSOperationQueue *queue = [NSOperationQueue new]; NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector