GCD 通知

/** 通知 */
@property (nonatomic,weak)id notice;

//    WS(weakSelf);
    _notice = [[NSNotificationCenter defaultCenter] addObserverForName:NOTIFICATION_DEL_COMPETITION_DATA_BJDC object:nil queue:NSOperationQueue.mainQueue usingBlock:^(NSNotification * _Nonnull note) {
        NSLog(@"通知方法调用");
    }];

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