How to save object in NSMutableDictionary

Question

I want to assign a object to NSMutableDictionary in one method and want to use it in another method as below:

- (void) aaa {
  NSString* aa = @"hello";
  [self.pcs setObject:aa forKey:@"a"];
}

- (void) bbb {
  NSLog(@"ccc %@", self.pcs[@"a"]);
} 

pcs is a property in @interface

@property(nonatomic, copy) NSMutableDictionary* pcs;

if I call aaa and bbb in another method, I want method bbb to print the log of ccc hello, but the result is ccc (null)

Can anybody tell me how to store object in NSMuableDictionary?

Answer 1

How did you initialise self.pcs?

If self.pcs is null, of course self.pcs[@"a"] is null