What is arc

ARC is the automatic reference calculation. English name automatic Reference counting.
In the beginning of iOS development, memory management is the need to manually, a reference to a resource, the reference to its calculation +1, when no longer used on-1, when the calculation of 0, there is no object reference to this resource, it can be freed. Later, people feel that this is not possible, what should be done automatically to do these things, of course, this is arc, will help you to add some of these +1-1 statements. Of course, this thing is the machine to do things, sometimes there will be less demand, after all, not a garbage collection mechanism. A memory leak occurs if you are not aware of it.

In fact, it automatically helps you insert some release code.

What is arc