UINavigationController学习

创建一个navigationController 并给他个视图控制器

 UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil]];

 这样的话 ViewController 就可以在 ViewDidLoad 里面进行操作 比如

//设定标题

    self.title = @"首页";

//修改颜色

  self.navigationController.navigationBar.tintColor = [UIColor redColor];

//修改为自定义图片

  采用继承自UINavigationController 然后重写 - (void)drawRect:(CGRect)rect

//修改右侧的BarButtonItem  同理可修改左侧按钮
    UIBarButtonItem *callModalViewButton = [[UIBarButtonItem alloc]  initWithTitle:@"按钮"
                                                                            style:UIBarButtonItemStyleBordered
                                                                           target:self
                                                                           action:@selector(doClicked)];
    self.navigationItem.rightBarButtonItem = callModalViewButton;

如果想更改推出来的子类的返回按钮的话 可以更改 self.navigationItem.backBarButtonItem;

在看 jinglijun 的博客的时候http://blog.csdn.net/jinglijun/article/details/7362329

他提到

         用了UINavigationController后，viewWillAppear方法是没有效果的，要用UINavigationControllerDelegate的

           – navigationController:willShowViewController:animated:  方法才可以达到这个目的。

          所以要做到这个，你必须做以下几步：

        1. 设置代理类 nav.delegate = self;
         2. 代理类实现UINavigationControllerDelegate Protocol
        3. 在代理类中添加– navigationController:willShowViewController:animated:方法
如：

[html] view plaincopy

1. - (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {  
2. [self.myTableView reloadData];  
3. } 
   

但是 我做这个测试了下  我的无论是父视图还是子视图 都会调用 ViewWillAppear.所以辩证性的看这个问题，等遇到了和jinglijun 一样的情况就注意下。

 隐藏NavigationBar

     [self.navigationController setNavigationBarHidden:YES animated:YES];

 navigation的推转动画是可以更改的

 CATransition *transition = [CATransitionanimation];
    transition.duration = 0.3;
    transition.timingFunction = [CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionDefault];
    transition.type = kCATransitionPush;
    transition.subtype = kCATransitionFromLeft;
    [self.navigationController.view.layeraddAnimation:transition forKey:nil];
    [self.navigationControllerpopViewControllerAnimated:NO];

 navigaiton的出栈有这么几种方式：

[self.navigationController popViewControllerAnimated:YES];  //回到上一个视图控制器

[self.navigationController popToViewController:viewController animated:YES];  //回到某一个视图控制器

用法：[self.navigationController popToViewController: [self.navigationController.viewControllers objectAtIndex: ([self.navigationController.viewControllers count] -层次)] animated:YES]; 
[self.navigationController popToRootViewControllerAnimated:YES]; //回到根视图控制器