How to stop/cancel/suspend/resume tasks on GCD queue [https://stackoverflow.com/questions/29492707/how-to-stop-cancel-suspend-resume-tasks-on-gcd-queue] You can't pause / cancel when using a GCD queue. If you need that functionality (and in a lot of general cases even if you don't) you should be using the higher level API - NSOperationQueue. This is built on top of GCD but it gives you the abili..
