GCD and Nsoperationqueue

1> GCD is a pure C language Api,nsoperationqueue is based on the GCD OC version package

2> GCD only supports FIFO (first in, first out) queues, Nsoperationqueue can easily adjust the order of execution, set the maximum number of concurrent

3> Nsoperationqueue can easily set dependencies between operation, and GCD need to write a lot of code to achieve

4> nsoperationqueue Support KVO, you can monitor whether operation is executing (isexecuted), whether it ends (isfinished), whether it is canceled (Iscanceld)

5> GCD executes faster than Nsoperationqueue.

Tasks do not depend too much on each other: GCD

dependencies between tasks \ or to monitor the execution of a task: Nsoperationqueue

GCD and Nsoperationqueue