iPhone开发【10】多视图技术总结之三：Navigation

iPhone开发【十】多视图技术总结之三：Navigation

转载请注明出处，原文网址：http://blog.csdn.net/m_changgong/article/details/8209309 作者：张燕广

实现的功能：通过Navigation，实现多视图切换。这是使用最多的一种多视图实现方式。

关键词：多视图 Navigation UINagivationController

1、创建一个Empty Application工程，命名为：MultiView-Navigation，如下图

2、选中工程中的Group MultiView-Tab，然后按住CMD（Windows键）+N，新建视图控制器FirstViewController，如下图

3、依照上步操作，新建视图控制器SecondViewController

4、修改AppDelegate.h，修改后如下：

////  AppDelegate.h//  MultiView-Navigation////  Created by Zhang Yanguang on 12-11-21.//  Copyright (c) 2012年 MyCompanyName. All rights reserved.//#import <UIKit/UIKit.h>#import "FirstViewController.h"#import "SecondViewController.h"@interface AppDelegate : UIResponder <UIApplicationDelegate>@property (strong, nonatomic) UIWindow *window;@property (strong, nonatomic) UINavigationController *navigationController;//导航视图控制器对象@end

5、修改AppDelegate.m，主要是修改didFinishLaunchingWithOptions方法，修改后如下：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];    // Override point for customization after application launch.    FirstViewController *firstViewController = [[FirstViewController alloc]initWithNibName:@"FirstViewController" bundle:nil];    //初始化navigationController，将firstViewController作为根视图控制器    navigationController = [[UINavigationController alloc]initWithRootViewController:firstViewController];//备注1    [self.window addSubview:navigationController.view];        self.window.backgroundColor = [UIColor whiteColor];    [self.window makeKeyAndVisible];    return YES;}

6、修改FirstViewController.h，添加goSecondView方法：

////  FirstViewController.h//  MultiView-Navigation////  Created by Zhang Yanguang on 12-11-21.//  Copyright (c) 2012年 MyCompanyName. All rights reserved.//#import <UIKit/UIKit.h>#import "SecondViewController.h"@interface FirstViewController : UIViewController-(void)goSecondView;@end

7、修改FirstViewController.m，主要是修改initWithNibName及实现goSecondView方法：

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        // Custom initialization        self.title = @"First View";        self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"SecondView" style:UIBarButtonItemStyleBordered target:self action:@selector(goSecondView)];            }    return self;}-(void)goSecondView{    SecondViewController *secondViewController = [[SecondViewController alloc]initWithNibName:@"SecondViewController" bundle:nil];    //跳转到secondViewController    [self.navigationController pushViewController:secondViewController animated:YES];//备注2}

8、视图控制器SecondViewController，仅修改SecondViewController.m中的initWithNibName方法，如下：

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        // Custom initialization        self.title = @"SecondView";    }    return self;}

代码解释：

备注1：firstViewController被push到navigationController中。

备注2：self.navigationController的英文注释为：// If this view controller has been pushed onto a navigation controller, return it.

所以，self.navigationController返回的正是备注1中的navigationController。

9、编译、运行，效果如下：

10、Navigation通常与TableView搭配使用，博文iPhone开发【七】常用控件之表TableView 编写了一个TableView的示例，那是一个单视图应用，现在搭配上Navigation将其修改为多视图应用。

11、将TableView示例工程复制一份名称修改为TableViewDemo-Nav，打开该工程进行修改。

12、首先，修改AppDelegate，添加UINavigationController的实例，AppDelegate.h修改后如下：

////  AppDelegate.h//  TableViewDemo////  Created by Zhang Yanguang on 12-10-25.//  博文：http://blog.csdn.net/m_changgong/article/details/8115137//  Copyright (c) 2012年 MyCompanyName. All rights reserved.//#import <UIKit/UIKit.h>@class ViewController;@interface AppDelegate : UIResponder <UIApplicationDelegate>@property (strong, nonatomic) UIWindow *window;@property (strong, nonatomic) ViewController *viewController;//添加navigationController@property (strong, nonatomic) UINavigationController *navigationController;@end

修改AppDelegate.m中的didFinishLaunchingWithOptions方法，如下：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];    // Override point for customization after application launch.    self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease];    //注释掉下面一行代码    /*    self.window.rootViewController = self.viewController;*/    //添加如下代码    self.navigationController = [[UINavigationController alloc]initWithRootViewController:self.viewController];    [self.window addSubview:self.navigationController.view];        [self.window makeKeyAndVisible];    return YES;}

13、新建视图控制器AppViewController（带xib）,如下：

14、ViewController.h修改后如下：

////  ViewController.h//  TableViewDemo////  Created by Zhang Yanguang on 12-10-25.//  Copyright (c) 2012年 MyCompanyName. All rights reserved.//#import <UIKit/UIKit.h>#import "AppViewController.h"@interface ViewController : UIViewController@property(nonatomic,retain)NSMutableArray *apps;@property(nonatomic,retain)AppViewController *appViewController;@end

ViewController.m中主要是实现了-(void)tableView:(UITableView*)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath方法，如下：

//实现didSelectRowAtIndexPath-(void)tableView:(UITableView*)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{    NSString *imageName = [NSString stringWithFormat:@"%d",[indexPath row]+1];    NSString *appName = [apps objectAtIndex:[indexPath row]];    //初始化appViewController    appViewController = [[AppViewController alloc]initWithNibName:@"AppViewController" bundle:nil];    //传递参数    appViewController.appName = appName;    appViewController.appIconName = imageName;    //跳转到appViewController    [self.navigationController pushViewController:appViewController animated:YES];}

15、AppViewController.h如下：

////  AppViewController.h//  TableViewDemo////  Created by Zhang Yanguang on 12-11-21.//  Copyright (c) 2012年 MyCompanyName. All rights reserved.//#import <UIKit/UIKit.h>@interface AppViewController : UIViewController@property(strong,nonatomic)NSString *appName;@property(strong,nonatomic)NSString *appIconName;@property(strong,nonatomic)IBOutlet UILabel *appNameLabel;@property(strong,nonatomic)IBOutlet UIImageView *appIconImgView;@end 

注意：将输出口与AppViewController.xib中的UI控件相连。AppViewController.xib如下:

////  AppViewController.m//  TableViewDemo////  Created by Zhang Yanguang on 12-11-21.//  Copyright (c) 2012年 MyCompanyName. All rights reserved.//#import "AppViewController.h"@interface AppViewController ()@end@implementation AppViewController@synthesize appName;@synthesize appIconName;@synthesize appNameLabel;@synthesize appIconImgView;- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        self.title = @"AppViewController";    }    return self;}- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view from its nib.        self.appNameLabel.text = appName;    self.appIconImgView.image = [UIImage imageNamed:appIconName];        NSLog(@"appName=%@,appIconName=%@",appName,appIconName);}- (void)viewDidUnload{    [super viewDidUnload];    // Release any retained subviews of the main view.    // e.g. self.myOutlet = nil;    appName = nil;    appIconName = nil;    appNameLabel = nil;    appIconImgView = nil;}- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{    return (interfaceOrientation == UIInterfaceOrientationPortrait);}@end

16、运行效果如下：

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