【NSNotificationCenter】使用

发送：[[NSNotificationCenter defaultCenter] postNotificationName:@"detectPwd" object:self userInfo:@{@"msg":dict}];

接收：[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(recerveAcquareCodeObserver:) name:@"detectPwd" object:nil];

-(void)recerveAcquareCodeObserver:(NSNotification *)sender{

NSDictionary * dic = sender.userInfo;}

移除：[[NSNotificationCenter defaultCenter] removeObserver:self name:@"detectPwd" object:nil];

}