通知

1：

[[NSNotificationCenter defaultCenter] postNotificationName:@"通知名字"
                                                                                            object:nil                                                         
                                                                                        userInfo:@{字典}];

2：

- (void)dealloc{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

3：

- (instancetype)init
{    self = [super init];
    if (self) {
        //接收通知
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(mainPageOperation:) name:@"mainPageOperation" object:nil];
    }    return self;}

4：

-(void)mainPageOperation:(NSNotification *)notification{   if (notification.userInfo[@"字典参数"]) {  }  }