Can't run a timer in GCD block with a dispatch_source_t in iOS application?

You have to make your dispatch_source_t a class property or instance variable, so it doesn't fall out of scope (because in ARC, when it falls out of scope, it is released). If you do that, your code will work fine, e.g.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.