///< .h

@interface ChatManager : NSObject <NSCopying>

@property (nonatomic) NSUInteger index;

@property (nonatomic, copy) NSString *name;

@property (nonatomic, strong) NSArray *titles;

@property (nonatomic, strong) NSDictionary *userInfo;

@property (nonatomic, strong) NSMutableString *muStr;

@end

///< .m

@implementation ChatManager

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

    ChatManager *mgr = [self.class new];

    mgr.name = _name;

    mgr.index = _index;

    mgr.muStr = _muStr;

    mgr.titles = _titles;

    mgr.userInfo = _userInfo;

    return mgr;

}

@end