viewDidAppear用于特定视图

Question

我有两个ViewControllers，称它们为A（初始VC）和B.它们通过segue连接。我想只在视图B出现时执行操作，所以我添加了viewDidAppear侦听器。但是，即使只加载A，也会调用B viewDidAppear()。这是正常的吗？如果是，我该怎么办？

编辑：

第一个VC：

- (IBAction)addBtnPressed:(id)sender {
    NSLog(@"add Btn pressed");
}

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    ViewController *destVC = [segue destinationViewController];
    destVC.destStation = self.destField.text;
    }

这些是连接到按钮

的插座

故事板

日志：

2015-02-06 23:03:35.499 a[47067:2112434] second view did load
2015-02-06 23:03:35.501 a[47067:2112434] first view did load
2015-02-06 23:03:35.586 a[47067:2112434] second view did appear
2015-02-06 23:03:35.588 a[47067:2112434] first view did appear

我不明白为什么第二个视图确实出现之前会被调用，而不是第一个