다른 뷰컨트롤러에서 테이블뷰 리로드 시키기

// Add this line in viewDidLoad in same class you want the tableView to refresh
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(refreshTableWithNotification:) name:@"RefreshTable" object:nil];

// Add this method just beneath viewDidLoad:
- (void)refreshTableWithNotification:(NSNotification *)notification {
    [self.tableView reloadData];
}

// Call this when ever you want to refresh the tableView in Class2
[[NSNotificationCenter defaultCenter] postNotificationName:@"RefreshTable" object:nil userInfo:nil];

userInfo = @{@"key": value};