NSString property and custom init

Question

I have 2 questions.

First - Are string declared as such in obj-c

@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *city;

Are those (nonatomic, copy) right or should I use (nonatomic, strong), or something else ?

Second - If I want to set custom initializer for above strings do I use

-(id)initWithName:(NSString *)n andCity:(NSString *)c
{
    self = [super init];
    if (self) {
        self.name = n;
        self.city = c;
    }
}

or should I use:

-(id)initWithName:(NSString *)n andCity:(NSString *)c
{
    self = [super init];
    if (self) {
        self.name = [n copy]
        self.city = [c copy];
    }
}

As I can see both ways seem to work for both questions but I'm sure one is more correct than the other, so I wanted to ask which should I use to write correct code in further projects.

Thanks.

Answer 1

First - it doesn't really matter if you use copy or strong. Personally i prefer to copy strings rather than retain them

Second - `

-(id)initWithName:(NSString *)n andCity:(NSString *)c

   {
      self = [super init];
       if (self) {
          self.name = n;
          self.city = c;
  }
}`

You don't need to use copy message once more cause your properties will copy n and c. If you apply your second piece of code you'll copy n and c twice and have a memory leak