automatic-ref-counting

I was reading the ARC docs on the llvm site: http://clang.llvm.org/docs/AutomaticReferenceCounting.html#autoreleasepool ..in particular about @autoreleasepool. In lot of current implementation using NSAutoreleasePool, I see cases where the pool is drained periodically during a loop iteration - how do we do the same with @autorelease pool, or is it all done for us somehow under the hood? Secondly, the docs state that if an exception is thrown, the pool isn't drained.... ok exceptions are by name exceptional, but if they do happen, you might like to recover without leaking a load of memory. The

I have a ARC ( automatic-reference-counting ) app that builds a static library (also ARC). The app will launch fine but when the an action is performed that reads or writes to a @property in the static library the app will crash with this error: dyld: lazy symbol binding failed: Symbol not found: _objc_setProperty_nonatomic Referenced from: /var/mobile/Applications/0E7ADBB4-FFE5-4CEB-B418-8A35A92E99D4/MyApp.app/MyApp Expected in: /usr/lib/libobjc.A.dylib dyld: Symbol not found: _objc_setProperty_nonatomic Referenced from: /var/mobile/Applications/0E7ADBB4-FFE5-4CEB-B418-8A35A92E99D4/MyApp.app

I've read posts about strong/weak self to break retain cycles but I am still confused as to how they work. I understand the use of __weak typeof(self) weakSelf = self to create a weak reference to self but I am confused about strong reference. As I understand it, the strong reference is so that there is a strong reference to self so that it doesn't get deallocated before the end of the block right? So why is it necessary to have __strong typeof(self) strongSelf = weakSelf ? Doesn't this end up pointing to the self object anyway? So why not just strongSelf = self ? Any non-weak object that you

Some background - I've built a custom Framework using Diney's guide at http://db-in.com/blog/2011/07/universal-framework-iphone-ios-2-0/ Its built for both armv6 / armv7 , its an ARC-based framework, compiled with a depolyment target of 4.3. When i put the resulting framework in a 5.0 project it works great, but when i put it in a 4.3 project (ARC or non-arc, doesnt matter), i get the following which i can't really understand ... I've also tried adding libarclite.a manually but it didn't change anything. ld: duplicate symbol _objc_retainedObject in /Users/freak4pc/Project/MyFramework.framework