NSThread sleepfortimeinterval blocks main thread

Question

I want to simulate a communication with a server. As the remote server will have some delays I want to use a background thread that has on it

 [NSThr         


        

Answer 1

It blocks whatever thread sleepForTimeInterval is running on. Run it on another thread to simulate your server delay like this:

dispatch_queue_t serverDelaySimulationThread = dispatch_queue_create("com.xxx.serverDelay", nil);
dispatch_async(serverDelaySimulationThread, ^{
     [NSThread sleepForTimeInterval:10.0];
     dispatch_async(dispatch_get_main_queue(), ^{
            //Your server communication code here
    }); 
});