如，從 rootViewControlle（presentViewControlle）到 ViewControlle1,再從ViewControlle1（presentViewControlle）到 ViewControlle2。現在實現從（ViewControlle2）直接dismissViewControlle 到 rootViewControlle

 1. dismiss兩個檢視控制器的按鈕方法該檢視控制器（ViewControlle2）是上個檢視控制器（ViewControlle1） presentViewControlle 的控制器

- (void)dismissButton:(UIButton *)sender
{
    //  當本檢視控制器dismiss 完成後註冊通知，名為“dismiss”
    [self dismissViewControllerAnimated:NO completion:^{
        [[NSNotificationCenter defaultCenter] postNotificationName:@"dismiss" object:self];
    }];
}
 

 2. 在 ViewControlle1.m 中的 viewWillAppear: 方法中監測上一個檢視控制器dismissViewControlle的通知，監測到之後就執行dismissSelf: 裡的方法

- (void)viewWillAppear:(BOOL)animated
{
    NSNotificationCenter *notification = [NSNotificationCenter defaultCenter];
    [notification addObserver:self selector:@selector(dismissSelf:) name:@"dismiss" object:nil];
}
 

3.得到通知執行的方法，讓 ViewControlle1 dismissViewControlle到rootViewControlle

- (void)dismissSelf:(NSNotificationCenter *)notification
{
    [self dismissViewControllerAnimated:NO completion:^{
        [[NSNotificationCenter defaultCenter] removeObserver:self name:@"dismiss" object:nil];
    }];
}

4.移除通知，可以在

- (void)viewDidDisappear:(BOOL)animated
{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"dismiss" object:nil];
}