The difference between "nil" and "@" in OC for NSString

Nil and Null do not have the essential difference between the empty, nil is the OC style, and NULL is the C style.

As an example,

NSString *name = nil;

This sentence represents a pointer to an empty instance of OC, you can think of this instance variable is not exist, it is in Java, such a way to throw an exception directly.

and the following

NSString *name = @ "";

This sentence represents the creation of a string of length 0, @ "" and nil have an essential difference.

So determine if a string is empty:

if ([name length] > 0)

{

If you have better ideas, you can communicate.

}

The difference between "nil" and "@" in OC for NSString