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.i...

I want to perform animation on main thread (cause UIKit objects are not thread-safe), but prepare it in some separate thread. I have (baAnimation - is CABasicAnimation allocated & inited before...

I'm writing a clone of OpenStruct in Objective-C, using forwardInvocation:. However, the compiler isn't aware of the forwarding at compile time apparently. Compiling with ARC gives me a ton of warn...

I try to pass CGRect to NSInvocation (setArgument:atIndex:). I wrap it by NSValue, push to the NSArry,then get from NSArray and use NSValue (getValue:). Calling of (getValue:) method causes the cha...

I don't understand why we have to call the setSelector method on NSInvocation objects when that information is already passed via the invocationWithMethodSignature. To create an NSInvocation objec...

I have a timer calling a method but this method takes one paramether: theTimer = [NSTimer scheduledTimerWithTimeInterval:animationInterval target:self selector:@selector(timer) userInfo:nil repeat...

I'm having trouble getting forwardInvocation to work. For some reason, the Objective-C runtime completely ignores my forwardInvocation: method and throws an unrecognized selector exception. My tes...