Objective-C NSString Question

问题

I need to return a NSString from a function:

NSString myfunc ( int x )
{
    // do something with x  
    NSString* myString = [NSString string];
    myString = @"MYDATA";   
    // NSLog(myString);

    return *myString;       
}

So, I call this function and get *myString. Is that a pointer to the data? How can I get to the data "MYDATA"?

回答1:

I would rewrite this function the following way:

NSString* myfunc( int x )
{
   NSString *myString = @"MYDATA";

   // do something with myString
   return myString;        
}

In Objective-C it is more common to work with pointer to objects, not objects themselves, i.e., in your example with NSString*, not NSString.

Moreover, @"MYDATA" is already a string, so you don't need to allocate and initialize myString before the assignment.

来源：https://stackoverflow.com/questions/602211/objective-c-nsstring-question