@interface Shape : NSObject<NSCopying>
@property int lineCount;
@property NSString *name;

-(id)copyWithZone:(NSZone *)zone;
-(id) initWithName: (NSString *) name lineCount: (int) lineCount;
@end

@implementation Shape
-(id)copyWithZone:(NSZone *)zone {
    return [[Shape alloc] initWithName:_name lineCount:_lineCount];
}

-(id) initWithName: (NSString *) name lineCount: (int) lineCount {
    self = [super init];
    if (self) {
        self.name = name;
        self.lineCount = lineCount;
    }
    return self;
}
@end

Shape *square = [[Shape alloc] initWithName:@"Square" lineCount:4];
Shape *squareCopy = [square copyWithZone:nil];