Iphone开发用导航控制器实现视图的分层切换（UINavigationController)

Iphone和android手机的一个不同的地方是，大部分的android手机都有返回键，而Iphone只有一个home键，所以我们会发现在Iphone的大部分应用中会在顶部有一个导航条，比如系统的设置界面，该导航条完全按照栈的方式来管理，所以可以很方便的实现后退的操作：





总结一下导航条的使用；

导航栏这个控件称为UINavigationController，常常用来作根视图控制器，生成对象后可以用该对象push UIViewController的对象，这样该UIViewController的对象就加到导航条的下部了，可以给视图控制器加title，会显示在导航栏上，也可以修改返回键的title，如右上图的左上角的setting按钮，如果默认的话是没有viewController的title的，返回键的title会是viewController的名字，接下来我们要用Xcode4.3中最基础的模板EmptyApplication来从头创建一个最原始的导航demo；

首先，新建一个project，选择EmptyApplication模板；



这样生成后是只有委托类的：



然后new两个ViewController出来，为了方便操作记得要附上xib文件；起名为FirstViewController，SecondViewController,在FirstViewController的xib文件中拖上一个button，连接一个nextClick方法用来切换到下一个视图；



现在开始操作代码

AppDelegate.h:

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<SPAN style="FONT-SIZE: 18px">#import <UIKit/UIKit.h> @interface AppDelegate : UIResponder <UIApplicationDelegate> @property (strong, nonatomic) UIWindow *window; @property (strong, nonatomic) UINavigationController *naviController; @end</SPAN>

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic)  UINavigationController *naviController;
@end

AppDelegate.m:

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<SPAN style="FONT-SIZE: 18px">#import "AppDelegate.h" #import "FirstViewController.h" @implementation AppDelegate @synthesize window = _window; @synthesize naviController; - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; //生成一个ViewControlle对象作为导航栏的第一个视图； FirstViewController *firstView = [[FirstViewController alloc]init]; naviController = [[UINavigationController alloc]initWithRootViewController:firstView]; //将该导航栏作为根视图控制器； self.window.rootViewController = naviController ; [self.window makeKeyAndVisible]; return YES; }</SPAN>

#import "AppDelegate.h"
#import "FirstViewController.h"
@implementation AppDelegate

@synthesize window = _window;
@synthesize naviController;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

//生成一个ViewControlle对象作为导航栏的第一个视图；
FirstViewController *firstView = [[FirstViewController alloc]init];

naviController = [[UINavigationController alloc]initWithRootViewController:firstView];
//将该导航栏作为根视图控制器；
self.window.rootViewController = naviController ;
[self.window makeKeyAndVisible];
return YES;
}

FirstViewController.h:

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<SPAN style="FONT-SIZE: 18px">#import <UIKit/UIKit.h> @interface FirstViewController : UIViewController - (IBAction)nextClick:(id)sender; @end</SPAN>

#import <UIKit/UIKit.h>

@interface FirstViewController : UIViewController
- (IBAction)nextClick:(id)sender;

@end

FirstViewController.m:

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<SPAN style="FONT-SIZE: 18px">#import "FirstViewController.h" #import "SecondViewController.h" @interface FirstViewController () @end @implementation FirstViewController - (IBAction)nextClick:(id)sender { SecondViewController *secondView = [[SecondViewController alloc]init]; [self.navigationController pushViewController:secondView animated:YES]; }</SPAN>

#import "FirstViewController.h"
#import "SecondViewController.h"
@interface FirstViewController ()

@end

@implementation FirstViewController

- (IBAction)nextClick:(id)sender {
SecondViewController *secondView = [[SecondViewController alloc]init];
[self.navigationController pushViewController:secondView animated:YES];
}

上面只是贴出了需要修改的代码，其余自动生成的都不用管，甚至SecondViewController都没有进行操作，所以我们会看到这样一种最简单的导航控制效果；





关键字：UINavigationController , IOS ,Iphone 开发 ，导航控制器