iOS 在一个view上添加Controller视图

1. 在View上添加一个Controller视图
   //核心代码，必须先addChildViewController

 self.chatListVc = [[ChatListVC alloc] init];
 [self addChildViewController:self.chatListVc]; 
 [self.view addSubview:self.chatListVc.view];
 self.chatListVc.view.frame = CGRectMake(0, kStatusbarAndNavbarHeight, kScreenWidth, kScreenHeight-kStatusbarAndNavbarHeight);

2. 销毁

[self.chatListVc.view removeFromSuperview];