I current have a set of asynchronous functions that are both called in the viewDidLoad(). At the end of each function is a bool that is set from false to true upon completion of the function. There...

I have recently, like a few people, discovered that [ALAssetsLibrary enumerateGroupsWithTypes] likes to run its blocks on another thread. What a shame that Apple didn't document that :-) In my cur...

I am implementing a health bar that animates via user input. These animations make it go up or down by a certain amount (say 50 units) and are the result of a button press. There are two buttons....

I have a property @property NSLock *myLock And I want to write two methods: - (void) lock and - (void) unlock These methods lock and unlock myLock respectively and they need to do this rega...

I have a loop which starts with a [lock lock]; because in the body of the loop I am creating another thread which needs to finish before the loop runs again. (The other thread will unlock it whe...

I have my main application delegate which contains a method that returns an object. This application delegate runs on the main thread. I also have a NSOperation that gets run on a different thread...