setViewControllers的应用

1—>2–->3  然后3pop/左滑动的时候直接到1

 

在2中 点击事件中 重置self.navigationController的controllers..

  [self.view whenTapped:^{

        NSMutableArray *aM = [NSMutableArray arrayWithArray:self.navigationController.viewControllers];

        [aM removeObject:a.lastObject];  

        UIViewController *v3 =[[ViewController3 alloc]init];

        [aM addObject:v3];

        [self.navigationController setViewControllers:aM animated:YES];  //重置完后只有1,3即使左滑动也是1

}];