Question

I want to use class variable. the following two approaches work well, but I don’t know what’s the different between them.

static NSString *str1 = @"str1";
NSString *const str2 = @"str2";
@implementation StrViewController

Answer 1

you can change the location to where str1 is pointing to but cannot do the same for str2 as it is a const pointer

this will work :

str1 = @"Hello";

while this won’t:

str2 = @"Hello";