我们在应用开发时经常需要实现很多功能,这时常常需要构建多视图应用程序,在ios平台下我们可以使用UINavigationController(导航控制器)来实现。
新建一个基于View的项目,修改AppDelegate.h中的代码如下:
#import <UIKit/UIKit.h>
@class ViewController;
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) ViewController *viewController;
@property (nonatomic, retain) UINavigationController *navController;
@end
我们定义了一个导航控制器,下面我们为导航控制器添加跟视图。在AppDelegate.m中修改一下代码:
@synthesize navController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.navController = [[UINavigationController alloc] init];
self.viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
[self.navController pushViewController:self.viewController animated:YES];
[self.window addSubview:self.navController.view];
[self.window makeKeyAndVisible];
return YES;
}
这里主要是初始化我们的导航控制器,然后为导航控制器添加子视图并在窗口中显示。
现在我们要在ViewController.h中定义一个按钮事件,用来响应我们根视图中的按钮事件。(如图中start按钮)
- (IBAction)startPressed:(id)sender;
然后再ViewController.m中实现该方法:
- (IBAction)startPressed:(id)sender{
FirstViewController *firstViewController = [[FirstViewController alloc] init];
[self.navigationController pushViewController:firstViewController animated:YES];
[firstViewController release];
}
我们定义一个新的的视图控制器firstViewController并添加到导航控制器中。FirstViewController实现了TableView如图:
为了程序更直观,我们在viewDidLoad()方法中添加如下代码为我们的应用程序添加标题:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.title = @"Cloay";
}
在FirstViewController.m 中添加如下代码:
1. #pragma mark - Table view delegate
2.
3. - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
4. {
5. // Navigation logic may go here. Create and push another view controller.
6. SecondViewController *detailViewController = [[SecondViewController alloc] init];
7. NSUInteger row = [indexPath row];
8. detailViewController.title = [self.listData objectAtIndex:row];
9. [self.navigationController pushViewController:detailViewController animated:YES];
10.
11. }
通过该方法我们实现了从FirstLevel进入SecondLevel如下图:如果我们选了Kobe
如果选了James:
我们看到图中有一张图片和一个Next按钮,你一定想到了我们要在试图中添加一个ImageView控件并要为Next按钮添加事件代码如下:
1. - (IBAction)nextPressed:(id)sender
2. {
3. ThirdViewController *thirdViewController = [[ThirdViewController alloc] init];
4. [self.navigationController pushViewController:thirdViewController animated:YES];
5. [thirdViewController release];
6. }
上面我们为按钮添加响应,我们还要在viewDidLoad中为ImageView设置图片:
1. - (void)viewDidLoad
2. {
3. [super viewDidLoad];
4. // Do any additional setup after loading the view from its nib.
5. // self.title = @"Second Level";
6. "%@", self.title);
7. if ([self.title isEqualToString:@"Kobe"]) {
8. "Kobe-Bryant.jpg"];
9. self.image.image = portrait;
10. [portrait release];
11. else if([self.title isEqualToString:@"James"]){
12. "James.jpg"];
13. self.image.image = portrait;
14. [portrait release];
15. else{
16. "ladybug.jpg"];
17. self.image.image = portrait;
18. [portrait release];
19. }
20.
21. }
我们根据title来设置图片。点击Next按钮进入ThirdLevel如图:
ThirdViewController中很简单只有一个Label控件,这里就不在贴代码了。
怎么样多视图程序就这样实现了,这只是一个简单的demo,你可以实现自己的功能。