postNotificationName是个同步调用

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- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    [self initData];    [self initView];        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reload) name:@"reload" object:nil];    [[NSNotificationCenter defaultCenter] postNotificationName:@"reload" object:nil];    NSLog(@"post 1");}static int i = 0;-(void)reload{    NSLog(@"call reloadData");    [_contactsTableView reloadData];    if(0 == i){        ++i;        [[NSNotificationCenter defaultCenter] postNotificationName:@"reload" object:nil];        NSLog(@"post 2");    }}

上面代码输出如下:

2015-03-24 13:44:43.099 MyContacts[2380:155259] call reloadData

2015-03-24 13:44:43.099 MyContacts[2380:155259] post 2

2015-03-24 13:44:43.100 MyContacts[2380:155259] post 1

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