How can I make a deep copy in Objective-C?

Question

I\'m learning ios development and I\'m confused with deep copying in Objective-C. For example,I have three class below. Now I want to deep copy ClassA, can anybody teach me

Answer 1

I had custom classes with long lists of properties, so I iterated over them:

@interface MyClass : NSObject 

#import 

-(id) copyWithZone: (NSZone *) zone {

    MyClass *myCopy = [[MyClass alloc] init];

    //deepCopy
    unsigned int numOfProperties;
    objc_property_t *properties = class_copyPropertyList([self class], &numOfProperties);

    for (int i = 0; i < numOfProperties; i++) {

       objc_property_t property = properties[i];
       NSString *propertyName = [[NSString alloc]initWithCString:property_getName(property) encoding:NSUTF8StringEncoding];
       [adressCopy setValue:[[self valueForKey:propertyName] copy] forKey:propertyName];
    }
    return myCopy;
}

All customClassProperties will need to implement this as well.