EaseUI中的EaseMessageViewControllerDelegate这些代理怎样才能使用，self.delegate＝self？

//直接使用EaseMessageViewController

EaseMessageViewController *chatController = [[EaseMessageViewController alloc] initWithConversationChatter:@"8001" conversationType:EMConversationTypeChat];

chatController.delegate=self;

//通过继承,使用EaseMessageViewController

self.delegate = self;