UINavigationController使用

    FirstViewController *firstVC=[[FirstViewController alloc]initWithNibName:@"FirstViewController" bundle:Nil];
    //实例化导航控制器
    UINavigationController *navController=[[UINavigationController alloc]initWithRootViewController:firstVC];
    
    //将包装好的导航控制器，作为rootviewcontroller
    self.window.rootViewController=navController;

以上是UINavigationController实例化

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使用UINavigationController推出下一个页面：

[self.navigationController pushViewController:secondVC animated:YES];

UINavigationController各种属性设置

    if (ISiOS7) {
        //在IOS7里，这个是设置导航条文字的颜色
        self.navigationController.navigationBar.tintColor=[UIColor redColor];
        //在IOS7里，这个是设置导航条背景的颜色
        self.navigationController.navigationBar.barTintColor=[UIColor blueColor];

    }else{
        //不是ios7，只能设置导航条的颜色
        self.navigationController.navigationBar.tintColor=[UIColor orangeColor];
    }
    //自定义标题
    UILabel *titleLable=[[UILabel alloc]initWithFrame:CGRectMake(0, 0, 100, 44)];
    //ios6里，label默认背景是白色，但是ios7默认透明
    if (!ISiOS7) {
        titleLable.backgroundColor=[UIColor clearColor];
    }
    titleLable.text=self.title;
    titleLable.font=[UIFont boldSystemFontOfSize:20];
    titleLable.textColor=[UIColor whiteColor];
    self.navigationItem.titleView=titleLable;
    
    
    //自定义导航条按键(利用系统自带的样式）
    UIBarButtonItem *barButtonItem1=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self action:@selector(onBarButtonItemClicked:)];
    UIBarButtonItem *barButtonItem2=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(onBarButtonItemClicked:)];
    
//    self.navigationItem.rightBarButtonItem=barButtonItem;//单独一个按键
    self.navigationItem.rightBarButtonItems=@[barButtonItem1,barButtonItem2];
    
    
    //自定义导航条按键，完全自定义
    UIButton *leftBarButton=[UIButton buttonWithType:UIButtonTypeCustom];
    [leftBarButton setTitle:@"左侧按键" forState:UIControlStateNormal];
    [leftBarButton setTitle:@"左侧点击" forState:UIControlStateHighlighted];
    [leftBarButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [leftBarButton setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];
    leftBarButton.frame=CGRectMake(0, 0, 100, 44);
    [leftBarButton addTarget:self action:@selector(onLeftBarButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
    //将上面自定义的按键，包装成一个导航条按键
    UIBarButtonItem *leftBarButtonItem=[[UIBarButtonItem alloc]initWithCustomView:leftBarButton];
    self.navigationItem.leftBarButtonItem=leftBarButtonItem;
    
    
    
    //设置导航条背景
    [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"navbg"] forBarMetrics:UIBarMetricsDefault];