UINavigationController 详解(最全的)

UINavigationController即导航控制器，是iOS里最常用的交互控件之一。下面介绍一下它的详细用法以及一些小的技巧

一.UINavigationController的结构组成。

看下图，UINavigationController有Navigation bar  ,Navigation View ,Navigation toobar等组成。

二.创建

在入口类里实现如下代码

 ViewController *rootVC = [[ViewController alloc]init];
     UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:rootVC];

 self.window.rootViewController = nav;

或者在根控制器里实现

 UINavigationController *nav = [[UINavigationController alloc] init];
     UIViewController *aView = [[UIViewController alloc] init];
     [nav pushViewController:aView animated:NO];//导航栏的第一个视图不要动画化

其中的rootVC就是导航控制器的根控制器，aView是根视图。

三.对导航条的设置

        //添加标题

 self.navigationItem.title = @"根视图";
 //给导航条加背景图
 [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"bg"] forBarMetrics:UIBarMetricsDefault];
 //添加titleView，可以用来自定义标题格式，也可以放置图片标题,图片大小要适中
 self.navigationItem.titleView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"titleView.png"]];
 //改变标题的颜色
 self.navigationController.navigationBar.titleTextAttributes = [NSDictionary dictionaryWithObject:[UIColor greenColor] forKey:NSForegroundColorAttributeName];

 //添加Logo,只在第一个页面显示,一些项目的主页会用到这个需求
 UIView *shareNavleftView = [[UIView alloc] init];
 shareNavleftView.frame = CGRectMake(0, 0, 115, 35);
 UIImageView *img = [[UIImageView alloc] init];
 img.image = [UIImage imageNamed:@"logo"];
 img.autoresizingMask = UIViewAutoresizingFlexibleWidth;
 img.frame = shareNavleftView.frame;
 [shareNavleftView addSubview:img];
 self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:shareNavleftView];
 //添加左右按钮
 UIBarButtonItem * leftItem = [[UIBarButtonItem alloc]initWithTitle:@"left" style:UIBarButtonItemStylePlain target:self action:@selector(leftClick)];
 self.navigationItem.leftBarButtonItem = leftItem ;
 UIBarButtonItem * rightItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemPause target:self action:@selector(rightItemClick)];
 self.navigationItem.rightBarButtonItem = rightItem ;
 //也可以简化为一句代码
 self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"left" style:UIBarButtonItemStylePlain target:self action:@selector(leftClick)];
 self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemPause target:self action:@selector(rightItemClick)];</span>

 //隐藏导航栏
 self.navigationController setNavigationBarHidden:YES animated:YES];</span>

四.界面之间的交互，采用的是出栈、入栈的形式

//进入到下一个界面

 FirstViewController *firstVC = [[FirstViewController alloc]init];
 self.navigationController pushViewController:firstVC animated:YES];

//返回之前的界面

 [self.navigationController popViewControllerAnimated:YES];

//返回指定的界面

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

//返回根视图

 [self.navigationController popToRootViewControllerAnimated:YES];

五.其他细节

 //隐藏返回按钮
 self.navigationItem.hidesBackButton =YES;

 //设置导航栏透明
 self.navigationController?.navigationBar.setBackgroundImage(UIImage(), forBarMetrics: UIBarMetrics.Default)
 //设置导航栏下部的线不显示
 self.navigationController?.navigationBar.shadowImage = UIImage()

六.含有导航栏的视图里tableView的坐标问题

所有版本对含有导航的视图控制器中的view有影响的因素有

self.edgesForExtendedLayout

self.navigationController!.navigationBar.translucent

self.automaticallyAdjustsScrollViewInsets

self.extendedLayoutIncludesOpaqueBars

具体我另开了一篇博文： http://blog.csdn.net/riven_wn/article/details/50856625